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 steering lock ECU is connected to the power source control ECU assembly and certification ECU. The steering lock ECU cannot activate the motor unless it obtains permission from both the ECUs. (The power source control ECU assembly permits the steering lock ECU to supply power to activate the motor.)

WIRING DIAGRAM







PROCEDURE

1. CHECK VEHICLE CONDITION

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

Result:





B -- INSPECT STEERING LOCK ACTUATOR ASSEMBLY
A -- Continue to next step.

2. READ VALUE OF TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Read the Data List. Enter the following menus: Body / Smart Access / Data List.

Smart Access





(e) Check if steering unlock command reception is confirmed.

OK:

"YES" is displayed on the Techstream display.

NG -- CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START
OK -- Continue to next step.

3. INSPECT STEERING LOCK ACTUATOR ASSEMBLY

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





Voltage:





OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

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

(a) Disconnect the K28 connector from the steering lock actuator assembly.





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

Resistance:





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

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

(a) Disconnect the K73 connector from the power source control ECU assembly.





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

Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER SOURCE CONTROL ECU ASSEMBLY

6. INSPECT STEERING LOCK ACTUATOR ASSEMBLY

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





Voltage:





OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

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

(a) Disconnect the K28 connector from the steering lock actuator assembly.





(b) Disconnect the K73 connector from the power source control ECU assembly.

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

Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER SOURCE CONTROL ECU ASSEMBLY