B2782

STEERING COLUMN: STEERING LOCK SYSTEM: B2782: Power Source Control ECU Malfunction
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.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When the power 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 power switch OFF, open the driver door. Then (with the power switch still OFF) open and close any door several times at 1.5 second intervals.

PROCEDURE

1. CHECK DTC OUTPUT (B2785)

(a) Check the DTCs.

OK:

DTC B2782 is output, but DTC B2785 is not output.

NG -- GO TO LIN COMMUNICATION SYSTEM (B2785) B2785
OK -- Continue to next step.

2. INSPECT STEERING LOCK ECU





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

Standard voltage:





HINT
When the steering lock is activated and the power switch is turned ON (IG), the steering lock motor activates to release the steering lock. The motor operation occurs for 2 to 15 seconds.

NG -- CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU AND BODY GROUND)

OK -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

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





(a) Disconnect the L33 steering lock ECU connector.

(b) Disconnect the L13 main body ECU connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU