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 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 Techstream via the certification ECU as the steering lock actuator assembly (steering lock ECU) is not connected to the CAN communication system.





WIRING DIAGRAM





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:
* If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P, 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.
* When replacing the steering lock ECU, registration must be performed Engine Immobiliser System (w/ Smart Key System).
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

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

(a) Disconnect the D29 steering lock ECU connector.

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

(c) 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.

2. INSPECT STEERING LOCK ECU (IGE VOLTAGE)

(a) Reconnect the D29 steering lock ECU connector.





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

Standard Voltage:





HINT
When the steering lock is locked and the engine 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





NG -- CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU)
OK -- Continue to next step.

3. CLEAR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

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

NEXT -- Continue to next step.

4. READ VALUE USING TECHSTREAM (POWER SUPPLY OPEN)

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Use the Data List to check if the steering lock control is functioning properly Scan Tool Testing and Procedures.

Smart Key





Result





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

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

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

(a) Disconnect the D89 power management control ECU connector.

(b) Disconnect the D29 steering lock 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 POWER MANAGEMENT CONTROL ECU Removal