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.

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.





WIRING DIAGRAM





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.

PROCEDURE

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

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





Standard Voltage:





HINT
The steering lock ECU and steering lock actuator assembly are supplied as a unit.

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

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

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

(a) Disconnect the E39 connector from the steering lock actuator assembly.





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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the E50 connector from the main body ECU.





(b) 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