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DTC B2788: IG2 Signal Malfunction [12/2019 - 10/2021]: Procedure

  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE) 
    1. Disconnect the H52 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY852498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      H52-6 (IG2) - Body ground Ignition switch ON 11 to 14 V
      H52-6 (IG2) - Body ground Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY852497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      H52-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY). Refer to  DISASSEMBLY [12/2019 - 10/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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