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.

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

  • ECU-IG2 NO. 3 fuse

  • Steering lock ECU (Steering lock actuator assembly)

  • 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. -
Related Data List and Active Test Items
DTC No. Data List Item Active Test Item
B2788 - -

WIRING DIAGRAM

A011R6CE06

INSPECTION PROCEDURE

Note

  • When using the Techstream 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 Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.

  • 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 Click here.

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 I24 steering lock ECU connector.

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

      A011S08E40
      Standard Resistance
      Tester Connection Condition Specified Condition
      I24-1 (GND) - Body ground Always Below 1 Ω
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Lock ECU (Steering Lock Actuator Assembly))

    4. Reconnect the I24 steering lock ECU connector.

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

      A011R25E32
      Standard Voltage
      Tester Connection Condition Specified Condition
      I24-6 (IG2) - I24-1 (GND) Engine switch on (IG) 11 to 14 V
      I24-6 (IG2) - I24-1 (GND) Engine switch off Below 1 V
      Text in Illustration
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY Click here