STEERING LOCK SYSTEM, Diagnostic DTC:B2788

DTC Code DTC Name
B2788 IG2 Signal Malfunction

DESCRIPTION

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

Tech Tips

The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU 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 Condition Trouble Area DTC Output Confirmation Operation
B2788 Mismatch between the steering lock actuator assembly (steering lock ECU) IG2 input from the LIN communication system and from the direct line (1-trip detection logic*).

  • IG2 fuse

  • Steering lock actuator assembly (steering lock ECU)

  • Harness or connector

 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. -

WIRING DIAGRAM

A005IP3E02

CAUTION / NOTICE / HINT

Note


  • When using the intelligent tester with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle and select "MANUAL" from the initial screen on the intelligent tester, and then select "KEY REGIST" under Model Code.

  • 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 inspection procedure.

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

  • Before replacing the steering lock actuator assembly (steering lock ECU), refer to the Service Bulletin.

PROCEDURE


  1. CHECK STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)


    1. Disconnect the F61 steering lock actuator assembly (steering lock ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F61-1 (GND) - Body ground Always Below 1 Ω
    3. A005KGTE02
      Text in Illustration
      *a

      Component with harness connected

      (steering lock actuator assembly (steering lock ECU))

      Reconnect the F61 steering lock actuator assembly (steering lock ECU) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F61-6 (IG2) - F61-1 (GND) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here

    C

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here