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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 109 (Hybrid Control System (AWD) - Diagnostic Codes (5 Of 6)) >> HYBRID CONTROL SYSTEM (for AWD) >> DTC P2530-12: IG2 Signal Circuit Short to Auxiliary Battery [12/2019 - 11/2023] >> Procedure

DTC P2530-12: IG2 Signal Circuit Short to Auxiliary Battery [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK AUXILIARY BATTERY VOLTAGE 
    1. Turn the ignition switch off and turn on the high beam headlights for 30 seconds. This will remove the surface charge from the auxiliary battery.
    2. Measure the auxiliary battery voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Positive (+) auxiliary battery terminal - Negative (-) auxiliary battery terminal 20°C (68°F), Ignition switch off 12.0 V or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  3

    Result: 

    NG 

    See step  2

  2. CHARGE OR REPLACE AUXILIARY BATTERY 
    1. Charge or replace the auxiliary battery.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Hybrid Control > Clear DTCs 

    2. Turn the ignition switch off.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Turn the ignition switch to ON and wait for 15 seconds or more.
    2. Turn the ignition switch off and wait for 2 minutes or more.
    3. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result  Proceed to
      P2530-12 is output. A
      P2530-12 is not output. B
    4. Turn the ignition switch off.

    Result: 

    B 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 11/2023] 

    Result: 

    A 

    See step  5

  5. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result  Proceed to
      U0129-87, U0140-87, U0151-87, U0164-87, U1107-87 or U1170-87 is output A
      Other than above B
    2. Turn the ignition switch off.

    Result: 

    B 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2019 - 11/2023] 

    Result: 

    A 

    See step  6

  6. CHECK HYBRID VEHICLE CONTROL ECU 
    1. Disconnect the A32 hybrid vehicle control ECU connector.
      GTY851789Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    2. Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      A32-35 (IG2) - A32-12 (E01) Ignition switch off
    3. Reconnect the A32 hybrid vehicle control ECU connector.

      Result

      Result  Proceed to
      9 V or higher A
      Below 9 V B

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    A 

    See step  7

  7. CHECK ECM 
    1. Disconnect the A32 hybrid vehicle control ECU connector.
      GTY851789Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    2. Disconnect the A27 ECM connector.
    3. Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      A32-35 (IG2) - A32-12 (E01) Ignition switch off
    4. Reconnect the A27 ECM connector.
    5. Reconnect the A32 hybrid vehicle control ECU connector.

      Result

      Result  Proceed to
      9 V or higher A
      Below 9 V B

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    A 

    See step  8

  8. INSPECT RELAY (IG2 NO. 1) 
    1. Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY904129Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 IG2 NO. 1 Relay
    2. Measure the resistance according to the value(s) in the table below.
      GTY483225Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
    3. Install the IG2 NO. 1 relay.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RELAY (IG2 NO. 1) 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - IG2 NO. 1 RELAY) 
    1. Disconnect the A32 hybrid vehicle control ECU connector.
    2. Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Measure the voltage according to the value(s) in the table below.
      GTY851791Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A32-35 (IG2) - Body ground Ignition switch off 1 V or less
    4. Install the IG2 NO. 1 relay.
    5. Reconnect the A32 hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

    1. Check for intermittent problems.

      Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 11/2023]

      1. Check the connection and terminal contact pressure of the connectors and wire harnesses between the hybrid vehicle control ECU and the IG2 NO. 1 relay.
      2. When the ignition switch is ON (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU and the IG2 NO. 1 relay.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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