Dtc B2782 Power Ecu Malfunction

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Steering Column. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STEERING LOCK ACTUATOR ASSEMBLY

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

CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU)

DTC B2782 Power ECU Malfunction


DESCRIPTION

The power source control ECU controls the power supply to activate the steering lock motor. This prevents the steering from being locked while the vehicle is moving.

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. Power source control ECU assembly

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2782 Power Ecu Malfunction


INSPECTION PROCEDURE

1.INSPECT STEERING LOCK ACTUATOR ASSEMBLY


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2782 Power Ecu Malfunction

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

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-3 (IGE) - L28-2 (SGND)
    1. Engine switch off
    2. Turn the engine switch on (ACC or IG)
    1. Motor active: Below 1 V
    2. Motor not active: 10 to 12 V
    L28-3 (IGE) - L28-2 (SGND)
    1. Adjust the shift lever to the P position
    2. Turn the engine switch off
    3. Open the driver's door
    1. Motor active: Below 1 V
    2. Motor not active: 10 to 12 V
    HINT:
    The steering lock ECU and steering lock actuator assembly are supplied as a unit.


OK
REPLACE STEERING LOCK ACTUATOR ASSEMBLY
NG


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


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2782 Power Ecu Malfunction

  1. Disconnect the L28 connector from the steering lock actuator assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-2 (SGND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2782 Power Ecu Malfunction

  1. Disconnect the L73 connector from the power source control ECU assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-3 (IGE) - L73-32 (SLR+)
    		Always
    		Below 1 Ω
    L28-3 (IGE) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER SOURCE CONTROL ECU ASSEMBLY