Steering Lock Motor Drive Power Circuit

DESCRIPTION

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

WIRING DIAGRAM

INSPECTION PROCEDURE

1. CHECK VEHICLE CONDITION

1. Check the problem symptom of the steering lock system.
   

   Result:

   Condition	Proceed to
   Steering lock cannot be released	A
   Steering cannot be locked	B

B	Go to step 6

A

2. READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.

2. Turn the engine switch on (IG), and turn the intelligent tester on.

3. Select the item below in the DATA LIST, and read its value displayed on the intelligent tester.

   Entry & Start: 

   Item	Measurement Item / Range (Display)	Normal Condition
   Lock/Unlock Receive	Steering lock command reception record/YES or NO	YES: Steering lock/unlock signal received NO: Steering lock/unlock signal not received

4. Check if steering unlock command reception is confirmed.

   OK:

   "YES" is displayed on the tester display.
   

NG	CHECK ENTRY AND START SYSTEM

OK

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

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

   Standard voltage:

   Tester connection (Symbols)	Condition	Specified condition
   J29-3 (IGE) - J29-1 (GND)	Engine switch off Turn the engine switch on (ACC or IG)	Motor activated: Below 1 V Motor not activated: 10 to 12 V

OK	PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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

1. Disconnect the J29 connector from the steering lock actuator assembly.

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

   Standard resistance:

   Tester connection (Symbols)	Condition	Specified condition
   J29-1 (GND) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

1. Disconnect the J55 connector from the power source control ECU.

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

   Standard resistance:

   Tester connection (Symbols)	Condition	Specified condition
   J29-3 (IGE) - J55-32 (SLR+)	Always	Below 1 Ω
   J29-3 (IGE) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE POWER SOURCE CONTROL ECU

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

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

   Standard voltage:

   Tester connection (Symbols)	Condition	Specified condition
   J29-3 (IGE) - J29-1 (GND)	Specified condition is checked after performing the following: Shift the shift lever to the P position Turn the engine switch off Open the driver's door	Motor activated: Below 1 V Motor not activated: 10 to 12 V

OK	PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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

1. Disconnect the J29 connector from the steering lock actuator assembly.

2. Disconnect the J55 connector from the power source control ECU.

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

   Standard resistance:

   Tester connection (Symbols)	Condition	Specified condition
   J29-3 (IGE) - J55-32 (SLR+)	Always	Below 1 Ω
   J29-3 (IGE) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE POWER SOURCE CONTROL ECU