STEERING LOCK SYSTEM, Diagnostic DTC:B2788

DTC Code DTC Name
B2788 IG2 Signal Malfunction

DESCRIPTION

This DTC is stored when the steering lock ECU (steering lock actuator or upper bracket assembly) detects an IG2 power supply malfunction.

Tech Tips

The steering lock ECU (steering lock actuator or upper bracket assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator or upper bracket assembly) is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2788 IG2 Signal Malfunction Mismatch between the steering lock ECU (steering lock actuator or upper bracket assembly) IG2 input from the LIN communication system and from the direct line. (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).))

  • IGN NO. 2 fuse

  • Steering lock ECU (Steering lock actuator or upper bracket assembly)

  • Harness or connector

 DTC Output Confirmation Operation: No confirmation operation is necessary (monitoring is continuous).
Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
The steering cannot be locked or unlocked. For this reason, the engine cannot be started. -
Related Data List and Active Test Items
DTC No. Data List Item Active Test Item
B2788 - -

WIRING DIAGRAM

B005NW0E01

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • After performing repairs, confirm that no DTCs are output again.

    Click here

  • When replacing the steering lock ECU (steering lock actuator or upper bracket assembly), registration must be performed (refer to Service Bulletin).

PROCEDURE


  1. INSPECT STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) (POWER SOURCE MODE SIGNAL)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the L1*1, J26*2 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    3. B005OLTC05
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      L1-1 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      J26-1 (GND) - Body ground Always Below 1 Ω

    4. Reconnect the L1*1, J26*2 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    5. B005PPJC11
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      L1-6 (IG2) - L1-1 (GND) Engine switch on (IG) 11 to 14 V
      L1-6 (IG2) - L1-1 (GND) Engine switch off Below 1 V
      for RHD
      Tester Connection Condition Specified Condition
      J26-6 (IG2) - J26-1 (GND) Engine switch on (IG) 11 to 14 V
      J26-6 (IG2) - J26-1 (GND) Engine switch off Below 1 V

      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR