LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 131 (Hybrid Control System - Diagnostic Codes (6 Of 7)) >> HYBRID CONTROL SYSTEM (for THS-HEV Model) >> DTC P2530-12: IG2 Signal Circuit Short to Auxiliary Battery [10/2022 - ] >> Procedure

DTC P2530-12: IG2 Signal Circuit Short to Auxiliary Battery [10/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 350h, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. 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 Result
      Positive (+) auxiliary battery terminal - Negative (-) auxiliary battery terminal 20°C (68°F), Ignition switch off 12.0 V or higher V

      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  CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ] 

    Result: 

    A 

    See step  5

  5. CHECK DTC OUTPUT (HYBRID CONTROL) 

    Pre-procedure1

    • None.

    Post-procedure1

    • 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
    • Turn the ignition switch off.

    Result: 

    B 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  6

  6. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU connectors.
      GTY1131612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      C59-26 (IGP) - C59-1 (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 connectors.

    Result: 

    B 

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

    Result: 

    A 

    See step  7

  7. CHECK ECM 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU connectors.
      GTY1131612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    • Disconnect the ECM connector.
    • Measure the voltage according to the value(s) in the table below.

      Condition

      Tester Connection Condition
      C59-26 (IGP) - C59-1 (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 connectors.

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  8

  8. INSPECT TRANSMISSION FLOOR SHIFT ASSEMBLY (SHIFT CONTROL ECU) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU connectors.
    • Disconnect the ECM connector.
    • Disconnect the transmission floor shift assembly (shift Control ECU)
    • Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY1131612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition
      C59-26 (IGP) - C59-1 (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 (shift Control ECU)
    • Reconnect the ECM connector.
    • Reconnect the hybrid vehicle control ECU connectors.

    Result: 

    B 

    REPLACE TRANSMISSION FLOOR SHIFT ASSEMBLY (SHIFT CONTROL ECU). Refer to  REMOVAL [10/2022 - ] 

    Result: 

    A 

    See step  9

  9. INSPECT RELAY (IGP NO. 1) 

    Refer to ON-VEHICLE INSPECTION [10/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE RELAY (IGP) 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - IGP RELAY) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU 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.
      GTY1131588Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C59-26 (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 connector.

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

    1. Check for intermittent problems.

      Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ]

      1. Check the connection and terminal contact pressure of the connectors and wire harnesses between the hybrid vehicle control ECU and the IGP 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 IGP NO. 1 relay.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals