Dtc B2782 Power Source Control Ecu Malfunction

Steering. Corolla. Zre142 Aze141
Steering Column. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

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

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

DTC B2782 Power Source Control ECU Malfunction


DESCRIPTION

The steering lock ECU activates the steering lock motor by the power from the main body ECU* through the IGE circuit. This prevents the steering from being locked while the vehicle is moving.
The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU as the steering lock ECU is not connected to the CAN communication system.
HINT:
*: The power source control ECU is not a physical part. This code refers to the power source control function performed by the main body ECU.

DTC No.
DTC Detecting Condition
Trouble Area
B2782
Steering lock motor drive control circuit is defective.
  1. Wire harness
  2. Steering lock actuator assembly (Steering lock ECU)
  3. Main body ECU

WIRING DIAGRAM


Corolla. Zre142 Aze141.Steering Column.Steering Lock System. Dtc B2782 Power Source Control Ecu Malfunction


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, open the driver side door with the engine switch off. Then (with the engine switch still off) open and close any door several times at 1.5-second intervals.
NOTICE:
If the steering lock actuator (steering lock ECU) is replaced, open and close the driver side door with the engine switch off and the shift lever in neutral to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.
1.INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)


    Corolla. Zre142 Aze141.Steering Column.Steering Lock System. Dtc B2782 Power Source Control Ecu Malfunction

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E39-3 (IGE) - E39-1 (GND)
    		The specified condition should be checked after performing the following:
    1. Turn the engine switch off
    2. Turn the engine switch on (ACC or IG)
    1. Motor activated: Below 1 V
    2. Motor not activated: 11 to 14 V
    E39-3 (IGE) - E39-1 (GND)
    		The specified condition should be checked after performing the following:
    1. Move the shift lever to P
    2. Turn the engine switch off
    3. Open the driver's door
    1. Motor activated: Below 1 V
    2. Motor not activated: 11 to 14 V
    HINT:
    The steering lock ECU and steering lock actuator assembly are supplied as a unit.


NG
Go to step 2
OK

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (COROLLA_ZRE142 RM000000UD005GX.html)

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


    Corolla. Zre142 Aze141.Steering Column.Steering Lock System. Dtc B2782 Power Source Control Ecu Malfunction

  1. Disconnect the E39 connector from the steering lock actuator assembly.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E39-1 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU)


    Corolla. Zre142 Aze141.Steering Column.Steering Lock System. Dtc B2782 Power Source Control Ecu Malfunction

  1. Disconnect the E50 connector from the main body ECU.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E39-3 (IGE) - E50-7 (SLR+)
    		Always
    		Below 1 Ω
    E39-3 (IGE) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU