STEERING LOCK SYSTEM, Diagnostic DTC:B2782

DTC Code DTC Name
B2782 Power Source Control ECU Malfunction

DESCRIPTION

The certification ECU (smart key ECU assembly) has a power source mode switching function.

This DTC is stored when the IGE input (the steering lock motor activation permission signal) sent directly from the certification ECU (smart key ECU assembly) to the steering lock ECU is determined to be abnormal.

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

Note

B2782

Power Source Control ECU Malfunction

Either condition is met (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).)):

  • The steering lock motor activation command circuit has a short circuit.

  • The steering lock motor activation command circuit has an open circuit.

Tip:

If the power supply signal from the LIN communication line does not match the power supply signal from the direct line, the system is determined to be malfunctioning.

  • Steering lock ECU (Steering lock actuator assembly)

  • Certification ECU (Smart key ECU assembly)

  • Harness or connector

DTC Output Confirmation Operation: Perform a steering lock/unlock operation. (The steering locks when a door is opened with the shift lever in P (for CVT) or N (for Multi-Mode Manual Transaxle) and the engine switch off. The steering unlocks when the engine switch is turned on (ACC) or on (IG) while carrying the key.)
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 engine cannot be started.

Prohibits the engine from being started (the engine does not crank).
Table 2. Related Data List and Active Test Items

DTC No.

Data List Item

Active Test Item

B2782

-

-

WIRING DIAGRAM

C277550E02

CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the vehicle engine 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

  • When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected.

    Click hereClick hereClick hereClick here

  • After performing repairs, perform the DTC output confirmation operation, and then 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).

PROCEDURE

  1. INSPECT STEERING LOCK ECU (MOTOR ACTIVATION COMMAND SIGNAL)

    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the E37 steering lock ECU connector.

    3. C157850C20

      *a

      Front view of wire harness connector

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E37-1 (GND) - Body ground

      Always

      Below 1 Ω

    4. Reconnect the E37 steering lock ECU connector.

    5. Move the shift lever to P*1 or N*2 and turn the engine switch off.

      • *1: for CVT

      • *2: for Multi-Mode Manual Transaxle

    6. C241547C14

      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))

      *b

      Steering lock motor not operating

      *c

      Steering lock motor operating

      Check the signal waveform according to the condition(s) in the table below.

      Standard Frequency

      Item

      Content

      Tester Connection

      E37-3 (IGE) - E37-1 (GND)

      Tool Setting

      2 V/DIV., 200 ms./DIV.

      Vehicle Condition

      Steering lock motor not operating → Operating → Not operating
      Tip:

      • When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.

      • In order to take measurements when the lock motor is operating, perform either of the following operations:

        • To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG) with the shift lever in P*1 or N*2.

        • To lock the steering, turn the engine switch off with the shift lever in P*1 or N*2, and then open a door.

          • *1: for CVT

          • *2: for Multi-Mode Manual Transaxle

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))Click here

    OK

  2. CLEAR DTC AND DATA LIST MALFUNCTION RECORD

    1. Clear the DTCs.

      Click here

      Body Electrical > Entry&Start > Clear DTCs

    2. Disconnect the cable from the negative (-) battery terminal, wait for 30 seconds or more, and then reconnect the cable to the negative (-) battery terminal to clear the record of malfunctions stored in the Data List.

      CAUTION:

      After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notices before proceeding with work.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK DTC

    1. Perform the DTC output confirmation operation.

    2. Check if DTC B2782 is output.

      Click here

      Body Electrical > Entry&Start > Trouble Codes

    Result

    Result

    Proceed to

    DTC B2782 is not output.

    A

    DTC B2782 is output.

    B
    A

    STEERING LOCK SYSTEM

    B

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY

    Click here

  4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    2. Disconnect the E37 steering lock ECU connector.

    3. Disconnect the E35 certification ECU (smart key ECU assembly) connector.

    4. Check for deformation and corrosion of the connector case and terminals.

      OK

      There is no deformation or corrosion of the connector case or terminals.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E37-3 (IGE) - E35-29 (SLR+)

      Always

      Below 1 Ω

      E37-3 (IGE) - Body ground

      Always

      10 kΩ or higher

      E35-29 (SLR+) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR