STEERING LOCK SYSTEM, Diagnostic DTC:B2788

DTC Code DTC Name
B2788 IG2 Signal Malfunction

DESCRIPTION

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

Tip:

The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU is connected to the certification ECU via LIN communication and communicates with other components via CAN communication through the certification ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2788

IG2 Signal Malfunction

Mismatch between the steering lock ECU IG2 input from the LIN communication system and from the direct line (1-trip detection logic*).

  • IGN fuse

  • Steering lock actuator assembly (steering lock ECU)

  • Harness or connector

  • *: Only output while a malfunction is present and the engine switch is on (IG).

DTC No.

DTC Output Confirmation Operation

B2788

No confirmation operation is necessary (monitoring is continuous).
Table 1. 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

C198342E20

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.

Tip:
Table 2. Related Data List and Active Test Items

DTC

Data List Item

Active Test Item

B2788

  • Entry&Start

  • IG2 Status

  • IG(Lin)

-

PROCEDURE

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

    1. Disconnect the G23 steering lock ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G23-1 (GND) - Body ground

      Always

      Below 1 Ω
    3. C197722C01

      *a

      Component with harness connected

      (Steering Lock ECU)

      Reconnect the G23 steering lock ECU connector.

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      G23-6 (IG2) - G23-1 (GND)

      Engine switch on (IG)

      10 to 14 V

      Engine switch off

      Below 1 V

      Result

      Result

      OK

      NG
    OK

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR