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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Hybrid Control System (Diagnostic Codes) (1 Of 5)) >> Hybrid Control System >> DTC P0A81-11: Hybrid/EV Battery Cooling Fan 1 Circuit Short to Ground; DTC P0A814B: Hybrid/EV Battery Cooling Fan 1 Over Temperature [10/2018 - ] >> Procedure

DTC P0A81-11: Hybrid/EV Battery Cooling Fan 1 Circuit Short to Ground; DTC P0A814B: Hybrid/EV Battery Cooling Fan 1 Over Temperature [10/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus UX 250h, 2023 Lexus UX 250h, 2022 Lexus UX 250h, 2021 Lexus UX 250h, and 2020 Lexus UX 250h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    4. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      "P0AFC00 or P0AFC96" is not output. A
      "P0AFC00 or P0AFC96" is also output. B
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - ] 

    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 power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

      Powertrain > Hybrid Control > Clear DTCs 

    4. 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 Battery cooling blower assembly operation and blower volume can be checked. OFF, 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
    5. Select air volume 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 accordance with fail-safe system operation, the hybrid vehicle control ECU sends a command to operate the battery cooling blower assembly.

    6. 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.

    7. Turn the power 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 power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery shield panel.

      Refer to PROCEDURE - Step 23 Refer to PROCEDURE - Step 23

    3. Disconnect the N40 battery voltage sensor connector.

      Refer to PROCEDURE - Step 24 Refer to PROCEDURE - Step 24

      NOTE:

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

    4. Disconnect the N42 battery cooling blower assembly connector.
      NOTE:

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

      GTY808369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the resistance according to the value(s) in the table below.
      GTY838163Courtesy 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)

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      N40-8 (FP0) - N42-1 (FP0) Power switch off Below 1 Ω
      N40-8 (FP0) - Body ground and other terminals Power switch off 10 kΩ or higher
    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Turn the power switch on (IG).
    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      N40-8 (FP0) - Body ground Power switch on (IG) Below 1 V
      NOTE:
      • Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the power switch is turned on (IG) 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 power switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the N42 battery cooling blower assembly connector.
    12. Reconnect the N40 battery voltage sensor connector.
    13. Install the No. 1 HV battery shield panel.

      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 power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery shield panel.

      Refer to PROCEDURE - Step 23 Refer to PROCEDURE - Step 23

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Connect the Techstream to the DLC3.
    5. Turn the power switch on (IG).
    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 Battery cooling blower assembly operation and blower volume can be checked. OFF, 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 air volume 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 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 hybrid vehicle control ECU 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
      N40-8 (FP0) - N40-5 (GND) Battery cooling blower assembly is operating.
      NOTE:

      Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      GTY790075Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Battery Voltage Sensor)

      HINT: 

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

      Result

      Result Proceed to
      Both of the value 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 power switch off.
    13. Disconnect the cable from the negative (-) auxiliary battery terminal.
    14. Install the No. 1 HV battery shield panel.

    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 power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the bench type rear seat cushion assembly.

      Refer to PROCEDURE - Step 6 Refer to PROCEDURE - Step 5

    3. Disconnect the N42 battery cooling bower assembly connector.
      NOTE:

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

      GTY808369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      N42-1 (FP0) - N42-3 (GND0) Power switch on (IG) 4.5 to 5.5 V
      GTY782959Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
      NOTE:
      • Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.
    7. Turn the power switch off.
    8. Disconnect the cable from the negative (-) auxiliary battery terminal.
    9. Reconnect the N42 battery cooling blower assembly connector.
    10. Install the bench type rear seat cushion assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    NG 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

  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 power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery shield panel.

      Refer to PROCEDURE - Step 23 Refer to PROCEDURE - Step 23

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Connect the Techstream to the DLC3.
    5. Turn the power switch on (IG).
    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 Battery cooling blower assembly operation and blower volume can be checked. OFF, 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 air volume 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 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 hybrid vehicle control ECU 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
      N40-8 (FP0) - N40-5 (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 power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      GTY790076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Battery Voltage Sensor)

      HINT: 

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

      Result

      Proceed to
      OK
      NG
    12. Turn the power switch off.
    13. Disconnect the cable from the negative (-) auxiliary battery terminal.
    14. Install the No. 1 HV battery shield panel.

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    NG 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

  7. CHECK FUSE (BATT FAN) 
    1. Remove the BATT FAN fuse from the No. 3 relay block.
      GTY787316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block
      *2 BATT FAN Fuse
    2. Measure the resistance of the BATT FAN fuse.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      BATT FAN fuse Power switch off Below 1 Ω
    3. Install the BATT FAN fuse to the No. 3 relay block.

      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 power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the bench type rear seat cushion assembly.

      Refer to PROCEDURE - Step 6 Refer to PROCEDURE - Step 5

    3. Disconnect the N42 battery cooling bower assembly connector.
      GTY808369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

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

    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Connect the Techstream to the DLC3.
    6. Turn the power switch on (IG).
    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 Switch Condition Specified Condition
      N42-2 (IG0) - N42-3 (GND0) Power switch on (IG) 11 to 14 V
      NOTE:
      • Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • Turning the power switch on (IG) with the connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this 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)
      GTY782947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
    10. Turn the power switch off.
    11. Disconnect the cable from the negative (-) auxiliary battery terminal.
    12. Install the bench type rear seat cushion 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 - 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 power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Disconnect the F60 hybrid vehicle control ECU connector.
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Check that each connector between the hybrid vehicle control ECU and battery cooling blower assembly is not loose or disconnected.
    3. Remove the bench type rear seat cushion assembly.

      Refer to PROCEDURE - Step 6 Refer to PROCEDURE - Step 5

    4. Disconnect the N42 battery cooling blower assembly connector.
      GTY808369Courtesy 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.
      GTY827623Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
      *b Front view of wire harness connector
      (to Battery Cooling Blower Assembly)

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      F60-38 (SI0) - N42-4 (SI0) Power switch off Below 1 Ω
      N42-4 (SI0) - Body ground and other terminals Power switch off 10 kΩ or higher
      NOTE:

      Make sure that each connector between the hybrid vehicle control ECU 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 power switch on (IG).
    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      N42-4 (SI0) - Body ground Power switch on (IG) Below 1 V
      NOTE:
      • Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the power switch is turned on (IG) 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 and battery cooling blower assembly is not loose or disconnected.

    9. Turn the power switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the N42 battery cooling blower assembly connector.
    12. Install the bench type rear seat cushion assembly.
    13. Reconnect the F60 hybrid vehicle control ECU 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 
    1. Remove the hybrid vehicle control ECU.

      Refer to REMOVAL [10/2018 - 07/2022] Refer to REMOVAL [07/2022 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY783543Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Hybrid Vehicle Control ECU)      		 - -

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      F60-38 (SI0) - F60-12 (E01) Power switch off 10 kΩ or higher
    3. Install the hybrid vehicle control ECU.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

    Result: 

    OK 

    See step  11

  11. CHECK HYBRID VEHICLE CONTROL ECU (SI0 VOLTAGE) 
    1. Turn the power switch on (IG).
    2. Measure the voltage according to the value(s) in the table below.
      GTY780620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      F60-38 (SI0) - F60-12 (E01) Power switch on (IG) 4.5 to 5.5 V
    3. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY 

    Refer to REMOVAL [10/2018 - ]

    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 power switch on (IG).
    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 Battery cooling blower assembly operation and blower volume OFF, 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 air volume 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 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 hybrid vehicle control ECU sends a command to operate the battery cooling blower assembly.

    8. Connect an oscilloscope to the F60 hybrid vehicle control ECU connector and check the waveform.
      GTY780613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -
      Item Content
      Tester Connection F60-38 (SI0) - F60-12 (E01)
      Equipment Setting 10 V/DIV., 1 ms./DIV.
      Condition Power switch on (IG), during Active Test

      HINT: 

      • Perform this inspection with the hybrid vehicle control ECU connector connected.
      • The wave length will vary with the operating speed of the battery cooling blower assembly.
    9. Turn the power 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 [10/2018 - ] 

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

  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 power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the bench type rear seat cushion assembly.

      Refer to PROCEDURE - Step 6 Refer to PROCEDURE - Step 5

    3. Disconnect the N42 battery cooling bower assembly connector.
      NOTE:

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

      GTY808369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      N42-3 (GND0) - Body ground Power switch off Below 1 Ω
      GTY782958Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
    5. Connect the N42 battery cooling bower assembly connector.
    6. Install the bench type rear seat cushion 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 - BODY GROUND) 
    1. Disconnect the F60 hybrid vehicle control ECU 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 Switch Condition Specified Condition
      F60-12 (E01) - Body ground Power switch off Below 1 Ω
      GTY810486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    3. Reconnect the F60 hybrid vehicle control ECU 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 - BODY GROUND) 
    1. Disconnect the F60 hybrid vehicle control ECU 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 Switch Condition Specified Condition
      F60-11 (E02) - Body ground Power switch off Below 1 Ω
      GTY810489Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    3. Reconnect the F60 hybrid vehicle control ECU 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 power switch 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.
      NOTE:

      Check the terminals of the relay for deformation and corrosion.

    3. Remove the bench type rear seat cushion assembly.

      Refer to PROCEDURE - Step 6 Refer to PROCEDURE - Step 5

    4. Disconnect the N42 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.
      GTY808369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      IGCT relay terminal 5 - N42-2 (IG0) Power switch off Below 1 Ω
      GTY825147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
      *b IGCT Relay Holder
      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 N42 battery cooling blower assembly connector.
    7. Install the bench type rear seat cushion assembly.
    8. Install the IGCT relay to the No. 3 relay block.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

    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 power switch 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.
    3. Remove the bench type rear seat cushion assembly.

      Refer to PROCEDURE - Step 6 Refer to PROCEDURE - Step 5

    4. Disconnect the N42 battery cooling blower assembly connector.
      GTY808369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

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

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

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      N42-2 (IG0) - Terminals other than 2 (BATT FAN fuse) and body ground Power switch off 10 kΩ or higher
      GTY778558Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block
      *a Front view of wire harness connector
      (to Battery Cooling Blower Assembly)
      *b BATT FAN Fuse Holder
      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 N42 battery cooling blower assembly connector.
    7. Install the bench type rear seat cushion assembly.
    8. Install the BATT FAN fuse to the No. 3 relay block.

      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 power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the bench type rear seat cushion assembly.

      Refer to PROCEDURE - Step 6 Refer to PROCEDURE - Step 5

    3. Disconnect the N42 battery cooling blower assembly connector.
      NOTE:

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

      GTY808369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      N42-2 (IG0) - N42-3 (GND0) and Body ground Power switch off 10 kΩ or higher
      GTY828185Courtesy 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 N42 battery cooling blower assembly connector.
    6. Install the bench type rear seat cushion 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 [10/2018 - ]

    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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