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Home >> Toyota >> 2019 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Hybrid Battery System (Lithium-Ion Battery) - Diagnostic Codes (1 Of 3)) >> HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY) >> DTC P0A81-11: Hybrid/EV Battery Cooling Fan 1 Circuit Short to Ground; DTC P0A81-4B: Hybrid/EV Battery Cooling Fan 1 Over Temperature [06/2020 - ] >> Procedure

DTC P0A81-11: Hybrid/EV Battery Cooling Fan 1 Circuit Short to Ground; DTC P0A81-4B: Hybrid/EV Battery Cooling Fan 1 Over Temperature [06/2020 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2025 Toyota RAV4, 2024 Toyota RAV4, 2023 Toyota RAV4, 2022 Toyota RAV4, and 2021 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.
    4. Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      "P0A81-11 or P0A81-4B" only is output, or DTCs except the ones in the table below are also output. A
      DTCs of hybrid battery system in the table below are output. B
      DTCs of hybrid control system in the table below are output. C
      System Relevant DTC
      Hybrid battery system P060A-47 Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
      P060B-49 Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
      P0606-87 Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
      Hybrid control system P0A1F-94 Hybrid/EV Battery Energy Control Module Unexpected Operation
    5. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID BATTERY SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2020 - ]

    Result: 

    C 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2020 - 12/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [12/2021 - 11/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2024 - ]

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE HYBRID BATTERY COOLING FAN) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Enter the following menus: Powertrain / HV Battery / Trouble Codes.
    4. Clear the DTCs and freeze frame data.

      Powertrain > HV Battery > Clear DTCs 

    5. Enter the following menus: Powertrain / HV Battery / Active Test / Control the Hybrid/EV Battery Cooling Fan.

      Powertrain > HV Battery > Active Test 

      Tester Display Measurement Item Control Range Restrict Condition
      Control the Hybrid Battery Cooling Fan Change the battery cooling blower assembly operation and blower volume. 0, 1, 2, 3, 4, 5, 6 Intake air temperature -10°C (14°F) or higher

      Powertrain > HV Battery > Active Test 

      Tester Display
      Control the Hybrid Battery Cooling Fan
    6. Select fan mode 6 in the "Control the Hybrid/EV Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.
      NOTE:

      If the Active Test cannot be performed, skip it and proceed to the next step to check if the fan operates and air is sucked. In accordance with fail-safe system operation, the battery ECU assembly sends a command to operate the battery cooling blower assembly.

    7. Check that the battery cooling blower assembly operates, air is sucked into the inlet duct and the operation sound is normal.

      HINT: 

      The battery cooling blower assembly may not stop even when turning the cooling fan off in the "Control the Hybrid/EV Battery Cooling Fan" Active Test. This is due to HV system control and is not a malfunction.

      OK

      The battery cooling blower assembly operates.

    8. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BATTERY COOLING BLOWER ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 23 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 23 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 23 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 23 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 23 [10/2023 - ]

    3. Disconnect the z26 battery ECU assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY975401Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the M34 battery cooling blower assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY974796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the resistance according to the value(s) in the table below.
      GTY993840Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
      *b Front view of wire harness connector
      (to Battery Cooling Blower Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      M34-1 (FP0) - z26-15 (FP0) Ignition switch off Below 1 Ω
      z26-15 (FP0) - Body ground and other terminals Ignition switch off 10 kΩ or higher
    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Turn the ignition switch to ON.
    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      z26-15 (FP0) - Body ground Ignition switch ON Below 1 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      HINT: 

      As there might be an intermittent malfunction, inspect the following items even if the measured voltage is as specified.

      Check the condition of each wire harness and each connector between the battery ECU assembly connector and battery cooling blower assembly.

    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the M34 battery cooling blower assembly connector.
    12. Reconnect the z26 battery ECU assembly connector.
    13. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (COOLING FAN FREQUENCY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 4 HV battery protector.

      Refer to PROCEDURE - Step 15 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 15 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 15 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 15 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 15 [10/2023 - ]

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Connect the Techstream to the DLC3.
    5. Turn the ignition switch to ON.
    6. Enter the following menus: Powertrain / HV Battery / Trouble Codes.
    7. Clear the DTCs and freeze frame data.

      Powertrain > HV Battery > Clear DTCs 

    8. Enter the following menus: Powertrain / HV Battery / Active Test / Control the Hybrid/EV Battery Cooling Fan.

      Powertrain > HV Battery > Active Test 

      Tester Display Measurement Item Control Range Restrict Condition
      Control the Hybrid Battery Cooling Fan Change the battery cooling blower assembly operation and blower volume. 0, 1, 2, 3, 4, 5, 6 Intake air temperature -10°C (14°F) or higher

      Powertrain > HV Battery > Active Test 

      Tester Display
      Control the Hybrid Battery Cooling Fan
    9. Enter the following menus: Powertrain / HV Battery / Data List / Hybrid/EV Battery Cooling Fan 1 Frequency.

      Powertrain > HV Battery > Data List 

      Tester Display
      Hybrid Battery Cooling Fan 1 Frequency
    10. Select each fan mode 1 to 6 in the "Control the Hybrid/EV Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.
      NOTE:

      If the Active Test cannot turn off the battery cooling blower assembly, skip it and proceed to the next step to check the frequency value. In accordance with fail-safe system operation, the battery ECU assembly sends a command to operate the battery cooling fan assembly.

    11. While the cooling fan is operating, compare the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) with the frequency value that was actually measured at the floor wire connector.

      Specified Condition

      Tester Connection Condition
      Nz1-14 (FP0) - Nz1-4 (GND) Battery cooling blower assembly is operating.
      NOTE:

      Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      GTY976101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Floor Wire)

      HINT: 

      Compare the values in each fan mode 1 to 6. If the Active Test cannot be performed, compare the values only in the current fan mode.

      Result

      Result Proceed to
      Both of the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) and the actual measured value at the floor wire connector are 0 Hz. A
      Other than above B
    12. Turn the ignition switch off.
    13. Disconnect the cable from the negative (-) auxiliary battery terminal.
    14. Install the No. 4 HV battery protector.

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  5

  5. CHECK BATTERY ECU ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the rear seat cushion leg sub-assembly.

      Refer to PROCEDURE - Step 8

    3. Disconnect the M34 battery cooling blower assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY974796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the ignition switch to ON.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      M34-1 (FP0) - M34-3 (GND0) Ignition switch ON 4.5 to 5.5 V
      GTY845679Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.
    7. Turn the ignition switch off.
    8. Disconnect the cable from the negative (-) auxiliary battery terminal.
    9. Reconnect the M34 battery cooling blower assembly connector.
    10. Install the rear seat cushion leg sub-assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

    Result: 

    NG 

    REPLACE BATTERY ECU ASSEMBLY 

    Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

  6. CHECK BATTERY ECU ASSEMBLY (FREQUENCY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 4 HV battery protector.

      Refer to PROCEDURE - Step 15 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 15 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 15 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 15 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 15 [10/2023 - ]

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Connect the Techstream to the DLC3.
    5. Turn the ignition switch to ON.
    6. Enter the following menus: Powertrain / HV Battery / Trouble Codes.
    7. Clear the DTCs and freeze frame data.

      Powertrain > HV Battery > Clear DTCs 

    8. Enter the following menus: Powertrain / HV Battery / Active Test / Control the Hybrid/EV Battery Cooling Fan.

      Powertrain > HV Battery > Active Test 

      Tester Display Measurement Item Control Range Restrict Condition
      Control the Hybrid Battery Cooling Fan Change the battery cooling blower assembly operation and blower volume. 0, 1, 2, 3, 4, 5, 6 Intake air temperature -10°C (14°F) or higher

      Powertrain > HV Battery > Active Test 

      Tester Display
      Control the Hybrid Battery Cooling Fan
    9. Enter the following menus: Powertrain / HV Battery / Data List / Hybrid/EV Battery Cooling Fan 1 Frequency.

      Powertrain > HV Battery > Data List 

      Tester Display
      Hybrid Battery Cooling Fan 1 Frequency
    10. Select each fan mode 1 to 6 in the "Control the Hybrid/EV Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.
      NOTE:

      If the Active Test cannot turn off the battery cooling blower assembly, skip it and proceed to the next step to check the frequency value. In accordance with fail-safe system operation, the battery ECU assembly sends a command to operate the battery cooling blower assembly.

    11. While the cooling fan is operating, compare the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) with the frequency value that was actually measured at the floor wire connector.

      Specified Condition

      Tester Connection Condition Specified Condition
      Nz1-14 (FP0) - Nz1-4 (GND) Battery cooling blower assembly is operating. Difference between the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) and the actual measured value at the floor wire connector is 10% or less.
      NOTE:

      Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      HINT: 

      Compare the values in each fan mode 1 to 6. If the Active Test cannot be performed, compare the values only in the current fan mode.

      GTY976101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Floor Wire)

      Result

      Proceed to
      OK
      NG
    12. Turn the ignition switch off.
    13. Disconnect the cable from the negative (-) auxiliary battery terminal.
    14. Install the No. 4 HV battery protector.

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

    Result: 

    NG 

    REPLACE BATTERY ECU ASSEMBLY 

    Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

  7. CHECK FUSE (BATT FAN) 
    1. Remove the BATT FAN fuse from the No. 3 relay block and junction block assembly.
      GTY870276Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly
      *2 BATT FAN Fuse
    2. Measure the resistance of the BATT FAN fuse.

      Standard Resistance

      Tester Connection Condition Specified Condition
      BATT FAN fuse Ignition switch off Below 1 Ω
    3. Install the BATT FAN fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  17

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (IGCT RELAY - BATTERY COOLING BLOWER ASSEMBLY) (VOLTAGE) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the rear seat cushion leg sub-assembly.

      Refer to PROCEDURE - Step 8

    3. Disconnect the M34 battery cooling blower assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY974796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Connect the Techstream to the DLC3.
    6. Turn the ignition switch to ON.
    7. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    8. Clear the DTCs and freeze frame data.

      Powertrain > Hybrid Control > Clear DTCs 

    9. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      M34-2 (IG0) - M34-3 (GND0) Ignition switch ON 11 to 14 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      HINT: 

      As there might be an intermittent malfunction, inspect the following items even if the measured voltage is as specified.

      • Installation condition of fuse(s) (before removing fuse(s)) (IG circuit)
      • Fuse condition (before and after removing fuse(s)) (IG circuit)
      • Connection condition of connectors (IG circuit)
      • Wire harness condition (IG circuit)
      • Wire harness condition (GND circuit)
      GTY845661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
    10. Turn the ignition switch off.
    11. Disconnect the cable from the negative (-) auxiliary battery terminal.
    12. Reconnect the M34 battery cooling blower assembly connector.
    13. Install the rear seat cushion leg sub-assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BATTERY COOLING BLOWER ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 23 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 23 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 23 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 23 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 23 [10/2023 - ]

    3. Disconnect the z26 battery ECU assembly connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check that each connector between the battery ECU assembly and battery cooling blower assembly is not loose or disconnected.
    4. Disconnect the M34 battery cooling blower assembly connector.
      GTY974796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check the terminals of the connector for deformation and corrosion.
    5. Measure the resistance according to the value(s) in the table below.
      GTY993841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
      *b Front view of wire harness connector
      (to Battery Cooling Blower Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-14 (SI0) - M34-4 (SI0) Ignition switch off Below 1 Ω
      M34-4 (SI0) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      NOTE:

      Make sure that each connector between the battery ECU assembly and battery cooling blower assembly is not loose or disconnected and its terminals are not deformed or corroded.

    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Turn the ignition switch to ON.
    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      M34-4 (SI0) - Body ground Ignition switch ON Below 1 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      HINT: 

      As there might be an intermittent malfunction, inspect the following items even if the measured voltage is as specified.

      Check the condition of each wire harness and each connector between the battery ECU assembly connector and battery cooling blower assembly.

    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the M34 battery cooling blower assembly connector.
    12. Reconnect the z26 battery ECU assembly connector.
    13. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK BATTERY ECU ASSEMBLY 
    1. Remove the battery ECU assembly.

      Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY993629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Battery ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-14 (SI0) -z26-27 (GND) Ignition switch off 10 kΩ or higher
    3. Install the battery ECU assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BATTERY ECU ASSEMBLY 

    Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    OK 

    See step  11

  11. CHECK BATTERY ECU ASSEMBLY (SI0 VOLTAGE) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 4 HV battery protector.

      Refer to PROCEDURE - Step 15 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 15 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 15 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 15 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 15 [10/2023 - ]

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Nz1-12 (SI0) -Nz1-4 (GND) Ignition switch ON 4.5 to 5.5 V
      GTY976100Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Floor Wire)
    6. Turn the ignition switch off.
    7. Disconnect the cable from the negative (-) auxiliary battery terminal.
    8. Install the No. 4 HV battery protector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

    Result: 

    OK 

    See step  12

  12. CHECK BATTERY COOLING BLOWER ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 4 HV battery protector.

      Refer to PROCEDURE - Step 15 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 15 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 15 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 15 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 15 [10/2023 - ]

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Connect the Techstream to the DLC3.
    5. Turn the ignition switch to ON.
    6. Enter the following menus: Powertrain / HV Battery / Trouble Codes.
    7. Clear the DTCs and freeze frame data.

      Powertrain > HV Battery > Clear DTCs 

    8. Enter the following menus: Powertrain / HV Battery / Active Test / Control the Hybrid/EV Battery Cooling Fan.

      Powertrain > HV Battery > Active Test 

      Tester Display Measurement Item Control Range Restrict Condition
      Control the Hybrid Battery Cooling Fan Change the battery cooling blower assembly operation and blower volume. 0, 1, 2, 3, 4, 5, 6 Intake air temperature -10°C (14°F) or higher

      Powertrain > HV Battery > Active Test 

      Tester Display
      Control the Hybrid Battery Cooling Fan
    9. Select each fan mode (1 to 6) in the "Control the Hybrid/EV Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.
      NOTE:

      If the Active Test cannot turn off the battery cooling blower assembly, skip it and proceed to the next step to check the waveform. In accordance with fail-safe system operation, the battery ECU assembly sends a command to operate the battery cooling blower assembly.

    10. Connect an oscilloscope to the Nz1 floor wire connector and check the waveform.
      Item Content
      Tester Connection Nz1-12 (SI0) - Nz1-4 (GND)
      Equipment Setting 10 V/DIV., 1 ms./DIV.
      Condition Ignition switch ON, during Active Test

      HINT: 

      • Perform this inspection with the battery ECU assembly and floor wire connectors connected.
      • The wave length will vary with the operating speed of the battery cooling blower assembly.
      GTY976100Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Floor Wire)
    11. Turn the ignition switch off.
    12. Disconnect the cable from the negative (-) auxiliary battery terminal.
    13. Install the No. 4 HV battery protector.
      GTY597063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Waveform 1

      Result

      Result Proceed to
      Normal (The pulse output of waveform 1) A
      No pulse generation B

    Result: 

    A 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

    Result: 

    B 

    REPLACE BATTERY ECU ASSEMBLY 

    Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

  13. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY - BODY GROUND) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the rear seat cushion leg sub-assembly.

      Refer to PROCEDURE - Step 8

    3. Disconnect the M34 battery cooling blower assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY974796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M34-3 (GND0) - Body ground Ignition switch off Below 1 Ω
      GTY845663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
    5. Connect the M34 battery cooling blower assembly connector.
    6. Install the rear seat cushion leg sub-assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BODY GROUND) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 23 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 23 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 23 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 23 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 23 [10/2023 - ]

    3. Disconnect the z26 battery ECU assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY975401Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-27 (GND) - Body ground Ignition switch off Below 1 Ω
      GTY993879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
    5. Reconnect the z26 battery ECU assembly connector.
    6. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BODY GROUND) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 23 [06/2020 - 08/2020] , or refer to PROCEDURE - Step 23 [08/2020 - 12/2021] , or refer to PROCEDURE - Step 23 [12/2021 - 10/2022] , or refer to PROCEDURE - Step 23 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 23 [10/2023 - ]

    3. Disconnect the z26 battery ECU assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY975401Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z26-3 (GND1) - Body ground Ignition switch off Below 1 Ω
      GTY993825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)
    5. Reconnect the z26 battery ECU assembly connector.
    6. Install the No. 1 HV battery hose.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (IGCT RELAY - BATTERY COOLING BLOWER ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the IGCT relay from the No. 3 relay block and junction block assembly.
      NOTE:

      Check the terminals of the relay for deformation and corrosion.

    3. Remove the rear seat cushion leg sub-assembly.

      Refer to PROCEDURE - Step 8

    4. Disconnect the M34 battery cooling blower assembly connector.
      NOTE:
      • Check that each connector between the IGCT relay and battery cooling blower assembly is not loose or disconnected.
      • Before disconnecting the connector, check that it is not loose or disconnected.
      GTY974796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the resistance according to the value(s) in the table below.
      GTY874253Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *2 IGCT Relay Terminal
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      IGCT relay terminal 5 - M34-2 (IG0) Ignition switch off Below 1 Ω
      NOTE:
      • When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.
      • Check that each connector between the IGCT relay and battery cooling blower assembly is not loose or disconnected.
    6. Reconnect the M34 battery cooling blower assembly connector.
    7. Install the rear seat cushion leg sub-assembly.
    8. Install the IGCT relay to the No. 3 relay block and junction block assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY 

    Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. CHECK HARNESS AND CONNECTOR (BATT FAN FUSE - BATTERY COOLING BLOWER ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the BATT FAN fuse from the No. 3 relay block and junction block assembly.
    3. Remove the rear seat cushion leg sub-assembly.

      Refer to PROCEDURE - Step 8

    4. Disconnect the M34 battery cooling blower assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY974796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the resistance according to the value(s) in the table below.
      GTY871093Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *2 BATT FAN Fuse Terminal
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      M34-2 (IG0) - Terminals other than 2 (BATT FAN fuse) and body ground Ignition switch off 10 kΩ or higher
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

    6. Reconnect the M34 battery cooling blower assembly connector.
    7. Install the rear seat cushion leg sub-assembly.
    8. Install the BATT FAN fuse to the No. 3 relay block and junction block assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  20

    Result: 

    OK 

    See step  18

  18. CHECK BATTERY COOLING BLOWER ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the rear seat cushion leg sub-assembly.

      Refer to PROCEDURE - Step 8

    3. Disconnect the M34 battery cooling blower assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY974796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M34-2 (IG0) - M34-3 (GND0) and Body ground Ignition switch off 10 kΩ or higher
      GTY841977Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Battery Cooling Blower Assembly)
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

    5. Reconnect the M34 battery cooling blower assembly connector.
    6. Install the rear seat cushion leg sub-assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FUSE (BATT FAN) 

    Result: 

    NG 

    See step  19

  19. REPLACE BATTERY COOLING BLOWER ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (BATT FAN) 

  20. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (BATT FAN) 

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