SMART ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2788

DTC Code DTC Name
B2788 IG2 Signal Malfunction

DESCRIPTION

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

Tech Tips

The steering lock ECU (steering lock actuator or upper bracket assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator or upper bracket assembly) 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 Note
B2788 IG2 Signal Malfunction Mismatch between the steering lock ECU (steering lock actuator or upper bracket assembly) IG2 input from the LIN communication system and from the direct line. (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).))

  • Steering lock ECU (steering lock actuator or upper bracket assembly)

  • Wire harness or connector

 DTC Output Confirmation Operation: 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 and Active Test
B2788 -

WIRING DIAGRAM

B0086E4E09

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 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 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 smart entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

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

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. Disconnect the K65 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. B00840IC53
      *a

      Front view of wire harness connector

      (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K65-6 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      K65-6 (IG2) - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)


    1. B00840IC54
      *a

      Front view of wire harness connector

      (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K65-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) for Manual Tilt and Manual Telescopic Steering Column: Click here
    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) for Power Tilt and Power Telescopic Steering Column: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR