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DTC P176D-12: IG2 Signal (Gear Shift Control Module "A") 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 SHIFT CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY) (IGP TERMINAL VOLTAGE) 

    Pre-procedure1

    • Disconnect the D25 shift control ECU (transmission floor shift assembly) connector.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      D25-1 (IGP) - Body ground Ignition switch off Below 1 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Connect the shift control ECU (transmission floor shift assembly) connector.

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. CLEAR DTC 

    Pre-procedure1

    • Turn the ignition switch to ON.
    • Clear the DTCs.

      Powertrain > Hybrid Control > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

    • Turn the ignition switch off.
    • Disconnect the GTS.
    • Leave the vehicle as is for 60 seconds or more.
      NOTE:
      • Do not connect the GTS.
      • Do not depress the brake pedal.
      • Do not open/close any of the doors.

    Result: 

    NEXT 

    See step  3

  3. CHECK DTC OUTPUT (PERFORM A REPRODUCTION TEST) 

    Pre-procedure1

    • Turn the ignition switch to ON and wait for 1 minute or more.
    • Turn the ignition switch to OFF and wait for 1 minute or more.
    • Turn the ignition switch to ON.
    • Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P176D-12 is not output A
      P176D-12 is output B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE SHIFT CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY). Refer to  REMOVAL [09/2023 - ] 

  4. CHECK HARNESS AND CONNECTOR (SHIFT CONTROL ECU - IGP NO. 1 RELAY) 

    Pre-procedure1

    • Disconnect the D25 shift control ECU (transmission floor shift 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.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      D25-1 (IGP) - Body ground Ignition switch off Below 1 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Install the IGP NO. 1 relay.
    • Connect the shift control ECU (transmission floor shift assembly) connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT RELAY (IGP NO. 1) 

    Pre-procedure1

    • Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher kΩ
      3 - 5 Battery voltage applied between terminals 1 and 2 Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG
      GTY1131775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 IGP NO. 1 Relay

    Post-procedure1

    • Install the IGP NO. 1 relay.

    Result: 

    NG 

    REPLACE RELAY (IGP NO. 1) 

    Result: 

    OK 

    See step  6

  6. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      B7-24 (IGPD) - Body ground Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG
      GTY1231984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

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

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ]

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (IGP NO. 1 RELAY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 

    Pre-procedure1

    • Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Disconnect the B7 certification ECU (smart key ECU Assembly) connector.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B7-24 (IGPD) - Body ground Ignition switch off Below 1 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Connect the certification ECU (smart key ECU Assembly) connector.
    • Install the IGP NO. 1 relay.

    Result: 

    OK 

    CHECK SMART KEY SYSTEM (FOR START FUNCTION). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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