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ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2782

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DTC Code DTC Name
B2782 Power Source Control ECU Malfunction
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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.

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 power 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 or upper bracket 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 state park (P) and the power switch off. The steering unlocks when the power 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 hybrid control system cannot be started. Prohibits the hybrid control system from being started.
Table 2. Related Data List and Active Test Items
DTC No. Data List and Active Test
B2782 -
Table 3. *a Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly) *b Certification ECU (Smart Key ECU Assembly) *c LIN Communication Line
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the power 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. 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 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 entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

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

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

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

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PROCEDURE


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    INSPECT STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) (MOTOR ACTIVATION COMMAND SIGNAL)


    1. B004WM1C06
      *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

      Using an oscilloscope, check the waveform.

      OK
      Tester Connection Tool Setting Condition Specified Condition
      G22-3 (IGE) - G22-1 (GND) 2 V/DIV., 200 ms./DIV.

      Any door opened when conditions below met, and then steering lock motor activated:


      • Shift state park (P)

      • Steering lock unlocked in advance by carrying key and turning power switch on (IG)

      • After above conditions met, power switch turned off

      Pulse generation

      (See waveform)
      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 power switch on (ACC) or on (IG).

        • To lock the steering, turn the power switch off with the shift state park (P), and then open a door.

      Result
      Proceed to
      OK
      NG

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    CLEAR DTC AND DATA LIST MALFUNCTION RECORD


    1. Clear the DTCs.


      1. Body Electrical > Entry&Start > Clear DTCs


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

      Note:

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

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      Result
      Proceed to
      NEXT

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    CHECK DTC


    1. Perform the DTC output confirmation operation.

    2. Check if DTC B2782 is output.


      1. 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)Click here

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


    1. Disconnect the G22 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. Disconnect the G71 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G22-3 (IGE) - G71-25 (SLR+) Always Below 1 Ω
      G22-1 (GND) - Body ground Always Below 1 Ω
      G22-3 (IGE) or G71-25 (SLR+) - Other terminals and body ground Always 10 kΩ or higher
      Note:

      If the result is not as specified, check for looseness in the connection which leads to ground.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR