Toyota Venza manuals

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


B

GO TO STEP 6


A

2.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(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

-

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

OK:

"YES" is displayed on the Techstream.


NG

CHECK SMART KEY SYSTEM (for Start Function)


OK

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)

  1. Turn the engine switch off
  2. 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))


OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE


NG

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))


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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

*1

Front view of wire harness connector

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

*2

Front view of wire harness connector

(to Power Management Control ECU)


OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

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:

  1. Move the shift lever to P
  2. Turn the engine switch off
  3. 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))


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

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.

(c) 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

*1

Front view of wire harness connector

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

*2

Front view of wire harness connector

(to Power Management Control ECU)


OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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