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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

The steering lock ECU determines the on/off status of the engine switch through the IG2 signal circuit.

After receiving an IG2 relay ON signal, the steering lock ECU determines that the vehicle is moving. The steering lock ECU does not lock the steering when it receives the IG2 relay ON signal. This prevents the steering from being locked while the vehicle is moving.

The diagnosis information of the steering lock ECU is transmitted to the tester via the certification ECU (smart key ECU assembly) as the steering lock ECU is not connected to the CAN communication system.

DTC No. DTC Detecting Condition Trouble Area
B2788 Different information is obtained from IG2 signals received directly from the IG2 circuit, and from IG2 signals sent via LIN communication for a period of 1 second.
  • IG2 relay

  • Wire harness

  • Main body ECU

  • Steering lock actuator assembly (Steering lock ECU)

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WIRING DIAGRAM

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INSPECTION PROCEDURE

When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following step to wake up the ECU:

Before starting the inspection, with the engine switch off, open the driver's door. Then (with the engine switch still off) open and close any door several times in 1.5-second intervals.

Note:

If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in the N position, open and close the driver's door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.

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PROCEDURE


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    INSPECT IGNITION RELAY NO. 2 (IG2)


    1. A017BZ1E75

      Remove the IG2 relay from the engine room relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      3 - 5 Always 10 kΩ or higher
      3 - 5 Battery voltage is applied to terminals 1 and 2 Below 1 Ω

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    CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND)


    1. A017EOEE13

      Disconnect the D10 connector from the steering lock actuator assembly.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      D10-1 (GND) - Body ground Always Below 1 Ω
      D10-2 (SGND) - Body ground Always Below 1 Ω

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    CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)


    1. A017EOEE14

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      D10-6 (IG2) - D10-1 (GND) Engine switch on (IG) 11 to 14 V
      D10-6 (IG2) - D10-2 (SGND) Engine switch on (IG) 11 to 14 V
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      *D10-6 (IG2) - D10-7 (B) Engine switch off 10 kΩ or higher

      *: This measurement is performed with the engine switch off to check for a short between IG2 and battery voltage.


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    REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)Click here

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    REPLACE IGNITION RELAY NO. 2 (IG2)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)