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 (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

DTC Output from

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 ECU (Steering lock actuator assembly)

  • Harness or connector

No confirmation operation is necessary (monitoring is continuous).

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

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 hybrid control system cannot be started.

-
Table 2. Related Data List and Active Test Items

DTC No.

Data List Item

Active Test Item

B2788

-

-

WIRING DIAGRAM

C240290E18

CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the power switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • 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

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

PROCEDURE

  1. INSPECT STEERING LOCK ECU (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 G5 steering lock ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G5-1 (GND) - Body ground

      Always

      Below 1 Ω

    4. Reconnect the G5 steering lock ECU connector.

    5. C157849C12

      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G5-6 (IG2) - G5-1 (GND)

      Power switch on (IG)

      11 to 14 V

      G5-6 (IG2) - G5-1 (GND)

      Power switch off

      Below 1 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR