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STEERING LOCK SYSTEM, Diagnostic DTC:B2788

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DTC Code DTC Name
B2788 IG2 Signal Malfunction
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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 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).

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 - -
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the vehicle power 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 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 Service Bulletin).

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PROCEDURE


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    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 H18 steering lock ECU connector.

    3. A0008JZE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H18-1 (GND) - Body ground Always Below 1 Ω
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

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

    4. Reconnect the H18 steering lock ECU connector.

    5. A0005GUE03

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H18-6 (IG2) - H18-1 (GND) Power switch on (IG) 11 to 14 V
      H18-6 (IG2) - H18-1 (GND) Power switch off Below 1 V
      Table 4. Text in Illustration
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))

    • OK

      REPLACE STEERING LOCK ACTUATOR ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR