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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Hybrid Control System - Diagnostic Codes (4 Of 5)) >> HYBRID CONTROL SYSTEM (for 1Motor-HEV Model) >> DTC P2530-12: IG2 Signal Circuit Short to Auxiliary Battery [09/2023 - ] >> Procedure

DTC P2530-12: IG2 Signal Circuit Short to Auxiliary Battery [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK AUXILIARY BATTERY VOLTAGE 

    Pre-procedure1

    • 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.
    • 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

    Post-procedure1

    • None.

    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 

    Pre-procedure1

    • None.
    • Clear the DTCs.

      Powertrain > Hybrid Control > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    NEXT 

    See step  4

  4. CHECK DTC OUTPUT (HYBRID CONTROL) 

    Pre-procedure1

    • Turn the ignition switch to ON and wait for 15 seconds or more.
    • Turn the ignition switch off and wait for 2 minutes or more.
    • Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result  Proceed to
      P2530-12 is output A
      P2530-12 is not output B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ] 

    Result: 

    A 

    See step  5

  5. CHECK DTC OUTPUT (HYBRID CONTROL) 

    Pre-procedure1

    • None.
    • 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
      None of the above conditions are met B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  6

  6. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
      GTY1239876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      D44-26 (IGP) - D44-1 (E1) Ignition switch off

      Result

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

    Post-procedure1

    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  7

  7. CHECK ECM 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
      GTY1239876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    • Disconnect the ECM connector.
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      D44-26 (IGP) - D44-1 (E1) Ignition switch off

      Result

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

    Post-procedure1

    • Reconnect the ECM connector.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  8

  8. CHECK TCM 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
      GTY1239876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    • Disconnect the TCM connector.
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      D44-26 (IGP) - D44-1 (E1) Ignition switch off

      Result

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

    Post-procedure1

    • Reconnect the TCM connector.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    B 

    REPLACE TCM. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  9

  9. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
      GTY1239876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    • Disconnect the air conditioning amplifier assembly connector.
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      D44-26 (IGP) - D44-1 (E1) Ignition switch off

      Result

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

    Post-procedure1

    • Reconnect the air conditioning amplifier assembly connector.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    B 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  10

  10. CHECK STEREO COMPONENT EQUALIZER ASSEMBLY 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
      GTY1239876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    • Disconnect the stereo component equalizer assembly connector.
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      D44-26 (IGP) - D44-1 (E1) Ignition switch off

      Result

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

    Post-procedure1

    • Reconnect the stereo component equalizer assembly connector.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    B 

    REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  11

  11. CHECK NETWORK GATEWAY ECU 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
      GTY1239876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    • Disconnect the network gateway ECU connector.
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      D44-26 (IGP) - D44-1 (E1) Ignition switch off

      Result

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

    Post-procedure1

    • Reconnect the network gateway ECU connector.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    B 

    REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  12

  12. CHECK SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
      GTY1239876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    • Disconnect the skid control ECU (brake actuator assembly) connector.
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      D44-26 (IGP) - D44-1 (E1) Ignition switch off

      Result

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

    Post-procedure1

    • Reconnect the skid control ECU (brake actuator assembly) connector.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    B 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  13

  13. CHECK TRANSMISSION FLOOR SHIFT ASSEMBLY 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
      GTY1239876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    • Disconnect the transmission floor shift assembly connector.
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      D44-26 (IGP) - D44-1 (E1) Ignition switch off

      Result

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

    Post-procedure1

    • Reconnect the transmission floor shift assembly connector.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    B 

    REPLACE TRANSMISSION FLOOR SHIFT ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  14

  14. INSPECT RELAY (IGP-NO. 1) 

    Refer to ON-VEHICLE INSPECTION [09/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE RELAY (IGP-NO. 1) 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
    • Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Measure the voltage according to the value(s) in the table below.
      GTY1231636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      D44-26 (IGP) - Body ground Ignition switch off 1 V or less V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Install the IGP NO. 1 relay.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

    1. Check for intermittent problems.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ]

      1. Check the connection and terminal contact pressure of the connectors and wire harnesses between the hybrid vehicle control ECU assembly and the No. 1 engine room relay block and No. 1 junction block assembly.
      2. When the ignition switch is ON (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU assembly and the No. 1 engine room relay block and No. 1 junction block assembly.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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