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Home >> Toyota >> 2020 >> RAV4 LE, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 65 (Hybrid Control System (AWD, W/ Nickel Metal Hydride Battery) - Diagnostic Codes (2 Of 8)) >> HYBRID CONTROL SYSTEM (for AWD with NICKEL METAL HYDRIDE 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 [02/2019 - 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 [02/2019 - 06/2020]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    4. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P0AFC-00 or P0AFC-96 is not output. A
      P0AFC-00 or P0AFC-96 is output. B
    5. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [02/2019 - 06/2020]

    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 / Hybrid Control / Trouble Codes.
    4. Clear the DTCs and freeze frame data.

      Powertrain > Hybrid Control > Clear DTCs 

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

      Powertrain > Hybrid Control > 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 > Hybrid Control > Active Test 

      Tester Display
      Control the Hybrid Battery Cooling Fan
    6. Select fan mode 6 in the "Control the Hybrid 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. In accordance with fail-safe system operation, the hybrid vehicle control 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 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 VOLTAGE SENSOR - 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 hybrid battery exhaust duct.

      Refer to PROCEDURE - Step 16 [02/2019 - 10/2019] , or refer to PROCEDURE - Step 16 [10/2019 - 06/2020]

    3. Disconnect the N17 battery voltage sensor connector.
      NOTE:

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

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

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

      GTY922810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N17-8 (FP0) - M34-1 (FP0) Ignition switch off Below 1 Ω
      N17-8 (FP0) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      GTY878116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Battery Voltage Sensor)
      *b Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
    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
      N17-8 (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 that each connector between the battery voltage sensor and battery cooling blower assembly is not loose or disconnected.

    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 N17 battery voltage sensor connector.
    13. Install the No. 1 hybrid battery exhaust duct.

      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.

    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 hybrid battery exhaust duct.

      Refer to PROCEDURE - Step 16 [02/2019 - 10/2019] , or refer to PROCEDURE - Step 16 [10/2019 - 06/2020]

    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 / Hybrid Control / Trouble Codes.
    7. Clear the DTCs and freeze frame data.

      Powertrain > Hybrid Control > Clear DTCs 

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

      Powertrain > Hybrid Control > 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 > Hybrid Control > Active Test 

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

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Hybrid Battery Cooling Fan 1 Frequency
    10. Select each fan mode 1 to 6 in the "Control the Hybrid 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 the frequency value. In accordance with fail-safe system operation, the hybrid vehicle control 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 Battery Cooling Fan 1 Frequency) with the frequency value that was actually measured at the battery voltage sensor connector.

      Specified Condition

      Tester Connection Condition
      N17-8 (FP0) - N17-5 (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.

      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.

      GTY871480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Battery Voltage Sensor)

      Result

      Result Proceed to
      Both of the values in the Data List (Hybrid Battery Cooling Fan 1 Frequency) and the actual measured value at the battery voltage sensor 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. 1 hybrid battery exhaust duct.

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  5

  5. CHECK BATTERY VOLTAGE SENSOR 
    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.

      GTY922810Courtesy 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 VOLTAGE SENSOR 

    Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]

  6. CHECK BATTERY VOLTAGE SENSOR (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. 1 hybrid battery exhaust duct.

      Refer to PROCEDURE - Step 16 [02/2019 - 10/2019] , or refer to PROCEDURE - Step 16 [10/2019 - 06/2020]

    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 / Hybrid Control / Trouble Codes.
    7. Clear the DTCs and freeze frame data.

      Powertrain > Hybrid Control > Clear DTCs 

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

      Powertrain > Hybrid Control > 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 > Hybrid Control > Active Test 

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

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Hybrid Battery Cooling Fan 1 Frequency
    10. Select each fan mode 1 to 6 in the "Control the Hybrid 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 the frequency value. In accordance with fail-safe system operation, the hybrid vehicle control 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 Battery Cooling Fan 1 Frequency) with the frequency value that was actually measured at the battery voltage sensor connector.

      Specified Condition

      Tester Connection Condition Specified Condition
      N17-8 (FP0) - N17-5 (GND) Battery cooling blower assembly is operating. Difference between the value in the Data List (Hybrid Battery Cooling Fan 1 Frequency) and the actual measured value at the battery voltage sensor 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.

      GTY871477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Battery Voltage Sensor)

      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

      Proceed to
      OK
      NG
    12. Turn the ignition switch off.
    13. Disconnect the cable from the negative (-) auxiliary battery terminal.
    14. Install the No. 1 hybrid battery exhaust duct.

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

    Result: 

    NG 

    REPLACE BATTERY VOLTAGE SENSOR 

    Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]

  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.

      GTY922810Courtesy 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 (HYBRID VEHICLE CONTROL 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. Disconnect the A31 hybrid vehicle control ECU assembly connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check that each connector between the hybrid vehicle control ECU assembly and battery cooling blower assembly is not loose or disconnected.
    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.
      • Check the terminals of the connector for deformation and corrosion.
      GTY922810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the resistance according to the value(s) in the table below.
      GTY840112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
      *b Front view of wire harness connector
      (to Battery Cooling Blower Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A31-38 (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 hybrid vehicle control 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 that each connector between the hybrid vehicle control ECU assembly and battery cooling blower assembly is not loose or disconnected.

    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. Install the rear seat cushion leg sub-assembly.
    13. Reconnect the A31 hybrid vehicle control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY 
    1. Remove the hybrid vehicle control ECU assembly.

      Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]

    2. Measure the resistance according to the value(s) in the table below.
      GTY888703Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A31-38 (SI0) - A31-12 (E01) Ignition switch off 10 kΩ or higher
    3. Install the hybrid vehicle control ECU assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]

    Result: 

    OK 

    See step  11

  11. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (SI0 VOLTAGE) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.
      GTY894607Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      A31-38 (SI0) - A31-12 (E01) Ignition switch ON 4.5 to 5.5 V
    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal.

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

      Powertrain > Hybrid Control > Clear DTCs 

    6. Enter the following menus: Powertrain / Hybrid Control / Active Test / Control the Hybrid Battery Cooling Fan.

      Powertrain > Hybrid Control > 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 > Hybrid Control > Active Test 

      Tester Display
      Control the Hybrid Battery Cooling Fan
    7. Select each fan mode 1 to 6 in the "Control the Hybrid 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 the waveform. In accordance with fail-safe system operation, the hybrid vehicle control ECU assembly sends a command to operate the battery cooling blower assembly.

    8. Connect an oscilloscope to the A31 hybrid vehicle control ECU assembly connector and check the waveform.
      Item Content
      Tester Connection A31-38 (SI0) - A31-12 (E01)
      Equipment Setting 10 V/DIV., 1 ms./DIV.
      Condition Ignition switch ON, during Active Test

      HINT: 

      • Perform this inspection with the hybrid vehicle control ECU assembly connector connected.
      • The wave length will vary with the operating speed of the battery cooling blower assembly.
      GTY894607Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)      		 - -
    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
      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 HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]

  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.

      GTY922810Courtesy 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 (HYBRID VEHICLE CONTROL ECU ASSEMBLY - BODY GROUND) 
    1. Disconnect the A31 hybrid vehicle control ECU assembly connector.
      NOTE:

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

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A31-12 (E01) - Body ground Ignition switch off Below 1 Ω
      GTY868655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    3. Reconnect the A31 hybrid vehicle control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - BODY GROUND) 
    1. Disconnect the A31 hybrid vehicle control ECU assembly connector.
      NOTE:

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

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A31-11 (E02) - Body ground Ignition switch off Below 1 Ω
      GTY868468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    3. Reconnect the A31 hybrid vehicle control ECU assembly connector.

      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.
      GTY922810Courtesy 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 HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]

    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.

      GTY922810Courtesy 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 terminal) 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.

      GTY922810Courtesy 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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