Steering Lock Motor Drive Power Circuit

STEERING COLUMN: STEERING LOCK SYSTEM: Steering Lock Motor Drive Power Circuit
- Steering Lock Motor Drive Power Circuit

DESCRIPTION

The main body ECU supplies the power to activate the motor of the steering lock actuator assembly.

The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU (smart key ECU assembly) as the 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.

PROCEDURE

1. CHECK VEHICLE CONDITION

(a) Check the problem symptom of the steering lock system.

Result





B -- INSPECT STEERING LOCK ECU
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (LOCK/UNLOCK RECEIVE)

(a) Use the Data List to check if the steering lock command is functioning properly.

Smart Key





OK:

Yes is displayed on the Techstream screen.

NG -- GO TO SMART KEY SYSTEM (FOR START FUNCTION) (HOW TO PROCEED WITH TROUBLESHOOTING) Smart Key System (for Start Function)
OK -- Continue to next step.

3. INSPECT STEERING LOCK ECU





(a) Immediately after turning the engine switch on (IG), measure the voltage between terminals E26-3 (IGE) and E26-1 (GND) of the steering lock ECU.

Result





B -- GO TO SMART KEY SYSTEM (FOR START FUNCTION) (PROBLEM SYMPTOMS TABLE) Problem Symptoms Table
A -- Continue to next step.

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





(a) Disconnect the E26 steering lock ECU connector.

(b) Disconnect the E1 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

5. INSPECT STEERING LOCK ECU





(a) Move the shift lever to P.

(b) Turn the engine switch off.

(c) Open the driver side door.

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

Standard Voltage:





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

OK -- GO TO SMART KEY SYSTEM (FOR START FUNCTION) (PROBLEM SYMPTOMS TABLE) Problem Symptoms Table

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





(a) Disconnect the E26 steering lock ECU connector.

(b) Disconnect the E1 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