Dtc B2782 Power Source Control Ecu Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STEERING LOCK ECU

CLEAR DTC

READ VALUE USING INTELLIGENT TESTER (POWER SUPPLY OPEN)

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU)

DTC B2782 Power Source Control ECU Malfunction


DESCRIPTION

The steering lock ECU activates the steering lock motor with the power from the power management control ECU through the IGE circuit. This prevents the steering from being locked while the vehicle is moving.
If NG (PAST) is displayed for Power Supply Open in the Data List, perform troubleshooting according to the procedures below.
The diagnosis information of the steering lock ECU is transmitted to the intelligent tester via the certification ECU as the steering lock actuator assembly (steering lock ECU) is not connected to the CAN communication system.

DTC Code
Detection Condition
Trouble Area
B2782
An IGE power supply circuit malfunction.
  1. Steering lock actuator assembly (steering lock ECU)
  2. Power management control ECU
  3. Harness or connector

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2782 Power Source Control Ecu Malfunction


INSPECTION PROCEDURE

HINT:
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 steps to wake up the ECU:
With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.
NOTICE:
  1. 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 notice before proceeding with work (LandCruiser RM000003YMD00TX.html).
  2. When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
  3. If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P (for Automatic Transmission), open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.
  4. When replacing the steering lock ECU, registration must be performed. Refer to the Service Bulletin for the registration procedure.
1.INSPECT STEERING LOCK ECU


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2782 Power Source Control Ecu Malfunction

  1. Disconnect the G35 steering lock ECU connector.

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

    1. *: for Automatic Transmission

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G35-1 (GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Steering Lock ECU)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2782 Power Source Control Ecu Malfunction

  1. Reconnect the G35 steering lock ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G35-3 (IGE) - G35-1 (GND)
    		Driver side door opened
    		Below 1 V (Steering lock motor operating)
    G35-3 (IGE) - G35-1 (GND)
    		Driver side door opened
    		11 to 14 V (Steering lock motor not operating)
    HINT:
    When the steering lock is locked and the engine is switch is turned on (IG), the steering lock motor activates to release the steering lock. The motor operates for 2 to 15 seconds.
    Text in Illustration
    *a
    		Component with harness connected
    (Steering Lock ECU)


NG
Go to step 4
OK


2.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000001T1B05MX.html).

  1. Disconnect and reconnect the cable to the negative (-) battery terminal to clear the malfunction history of Power Supply Open.


NEXT


3.READ VALUE USING INTELLIGENT TESTER (POWER SUPPLY OPEN)

  1. Check for DTCs (LandCruiser RM000001T1B05MX.html).

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

    Entry&Start
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Power Supply Open
    		Open in ECU record/NG (PAST) or OK
    		NG (PAST): Open in ECU
    OK: No malfunction
    		-

    Result
    Result
    		Proceed to
    1. B2782 is not output
    2. "OK" is displayed on the tester.
    		A
    1. B2782 is output
    2. "NG (PAST)" is displayed on the tester.
    		for Manual Tilt and Manual Telescopic Steering Column
    		B
    for Power Tilt and Power Telescopic Steering Column
    		C


B
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01JX.html)

C
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01KX.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

4.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU)

  1. Disconnect the G51 power management control ECU connector.

  1. Disconnect the G35 steering lock ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G35-3 (IGE) - G51-8 (SLR+)
    		Always
    		Below 1 Ω
    G35-3 (IGE) or G51-8 (SLR+) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER MANAGEMENT CONTROL ECU (LandCruiser RM0000039R5026X.html)