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.

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
B2782

Either condition is met (1-trip detection logic*):

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

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

Tech Tips

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

 Perform a steering lock/unlock operation. (The steering locks when a door is opened with the shift lever in P and the engine switch off. The steering unlocks when the engine switch is turned on (ACC) or on (IG) while carrying the key.)
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).
Related Data List and Active Test Items
DTC No. Data List Item Active Test Item
B2782

    Smart Key

  • Power Supply Short

 -

WIRING DIAGRAM

A011TBDE10

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.

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

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 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. Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P.

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

      A011RAQE02
      Standard Frequency
      Item Content
      Tester Connection I24-3 (IGE) - I24-1 (GND)
      Tool Setting 2 V/DIV., 200 ms./DIV.
      Vehicle Condition Steering lock motor not operating → Steering lock motor operating → Steering lock motor not operating
      Text in Illustration
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))
      *b Steering lock motor not operating
      *c Steering lock motor operating

      Tech Tips

      • 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.

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

    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.

    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 here.

    NEXT

  3. READ VALUE USING TECHSTREAM (POWER SUPPLY SHORT)

    1. Perform the DTC output confirmation operation.

    2. Check if DTC B2782 is output Click here.

    3. Use the Data List to check if the steering lock control is functioning properly.

      Smart Key
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Power Supply Short Record of malfunction of signal sent to steering lock motor (steering lock actuator assembly) from certification ECU (smart key ECU assembly) (short circuit) / OK or NG(Past)

      OK: No record of malfunction (short circuit)

      NG(Past): Record of malfunction (short circuit) exists

      		 This item records malfunctions in the circuit between the certification ECU (smart key ECU assembly) and steering lock motor (steering lock actuator assembly).
      Result
      Result Proceed to

      • DTC B2782 is not output.

      • "OK" is displayed on the Techstream.

      		 A

      • DTC B2782 is output.

      • "NG(Past)" is displayed on the Techstream.

      		 B
    B

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY Click here

    A

    SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR)

  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 I24 steering lock ECU connector.

    3. Disconnect the I78 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
      I24-3 (IGE) - I78-29 (SLR+) Always Below 1 Ω
      I24-3 (IGE) - Body ground Always 10 kΩ or higher
      I78-29 (SLR+) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here