Lexus IS250 · Service Manual STEERING

B2782

Diagnostic trouble codes

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

WIRING DIAGRAM

C113485E02

INSPECTION PROCEDURE


1. INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

  1. C106483E16
    Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    J29-3 (IGE) - J29-1 (GND)
    		 Specified condition is checked after performing the following:
    1. Engine switch off
    2. Turn the engine switch on (ACC or IG)
    1. Motor activated: Below 1 V
    2. Motor not activated: 10 to 12 V
    J29-3 (IGE) - J29-1 (GND)
    		 Specified condition is checked after performing the following:
    1. Shift the shift lever to the P position
    2. Turn the engine switch off
    3. Open the driver's door
    1. Motor activated: Below 1 V
    2. Motor not activated: 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 (STEERING LOCK ECU)
NG


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

  1. C106484E19
    Disconnect the J29 connector from the steering lock actuator assembly.

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

    Standard resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    J29-1 (GND) - Body ground
    		 Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. C106491E10
    Disconnect the J55 connector from the power source control ECU.

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

    Standard resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    J29-3 (IGE) - J55-32 (SLR+)
    		 Always
    		 Below 1 Ω
    J29-3 (IGE) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER SOURCE CONTROL ECU


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