SMART ENTRY AND START SYSTEM(for Start Function), 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 (steering lock actuator or upper bracket assembly) is determined to be abnormal.

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
B2782 Power Source Control ECU Malfunction

Either of the following conditions 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.

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 or upper bracket assembly)

  • Certification ECU (smart key ECU assembly)

  • Wire 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 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 and Active Test
B2782 -

WIRING DIAGRAM

B0070KUE10
*a Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly)
*b Certification ECU (Smart Key ECU Assembly)
*c LIN Communication Line

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

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

    Click here

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (GROUND)


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

    2. B0071PMC52
      *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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)


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

    2. Move the shift lever to P and turn the engine switch off.

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

      B006ZU1C12
      *a

      Component with harness connected

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

      		 *b Steering lock motor not operating
      *c Steering lock motor operating *d Waveform
      OK
      Tester Connection Condition Tool Setting Specified Condition
      K65-3 (IGE) - K65-1 (GND) 2 V/DIV., 200 ms./DIV. Steering lock motor not operating → Operating → Not operating

      Pulse generation

      (See waveform)

      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 electrical key transmitter sub-assembly and turn the engine switch on (ACC) or on (IG).

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

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CLEAR DTC AND DATA LIST MALFUNCTION RECORD


    1. Clear the DTCs.


      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 here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTC


    1. Perform the DTC output confirmation operation.

    2. Check if DTC B2782 is output.


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Result Proceed to
      DTC B2782 is not output A
      DTC B2782 is output B

    A

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

    B

    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

  5. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


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

    2. Disconnect the K62 certification ECU (smart key ECU assembly) connector.

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

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K65-3 (IGE) - K62-25 (SLR+) Always Below 1 Ω
      K65-3 (IGE) or K62-25 (SLR+) - Other terminals and 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