Toyota Venza: Steering Lock Motor Drive Power Circuit

Toyota Venza Service Manual / Steering Column / Steering Lock System / Steering Lock Motor Drive Power Circuit

DESCRIPTION

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

WIRING DIAGRAM

PROCEDURE

1.	CHECK VEHICLE CONDITION

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

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

GO TO STEP 6

2.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(d) Check the steering lock command reception record. Enter the following menus: Body Electrical / Smart Key / Data List.

Smart Key

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Lock/Unlock Receive	Steering lock command reception record / Yes or No	Yes: Steering lock/unlock signal received No: Steering lock/unlock signal not received	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Lock/Unlock Receive

Steering lock command reception record / Yes or No

Yes: Steering lock/unlock signal received

No: Steering lock/unlock signal not received

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

OK:

"YES" is displayed on the Techstream.

CHECK SMART KEY SYSTEM (for Start Function)

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D17-3 (IGE) - D17-1 (GND)	Turn the engine switch off Turn the engine switch on (ACC or IG)	Motor activated: Below 1 V Motor not activated: 10 to 12 V

Text in Illustration

*1	Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly))

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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

(a) Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D17-1 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the D43 connector from the power management control ECU.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D17-3 (IGE) - D43-8 (SLR+)	Always	Below 1 Ω
D17-3 (IGE) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Steering Lock ECU (Steering Lock Actuator Assembly))

Front view of wire harness connector

(to Power Management Control ECU)

REPLACE POWER MANAGEMENT CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D17-3 (IGE) - D17-1 (GND)	Specified condition is checked after performing the following: Move the shift lever to P Turn the engine switch off Open the driver's door	Motor activated: Below 1 V Motor not activated: 10 to 12 V

Text in Illustration

*1	Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly))

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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

(a) Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly).

(b) Disconnect the D43 connector from the power management control ECU.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D17-3 (IGE) - D43-8 (SLR+)	Always	Below 1 Ω
D17-3 (IGE) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Steering Lock ECU (Steering Lock Actuator Assembly))

Front view of wire harness connector

(to Power Management Control ECU)

REPLACE POWER MANAGEMENT CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

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