Steering Lock System (Diagnostic Codes & Circuit Tests): Overview Toyota Venza I

DESCRIPTION

If the steering lock ECU (steering lock actuator assembly) determines that there is a malfunction inside the ECU, it outputs this DTC. Diagnostic communication between the steering lock ECU (steering lock actuator assembly) and the Techstream is performed via the certification ECU as the steering lock ECU (steering lock actuator assembly) is not connected to CAN.

The power management control ECU controls the power supply to activate the steering lock motor. This prevents the steering wheel from being locked while the vehicle is moving.

Scheme 66

The steering lock ECU (steering lock actuator assembly) receives power from the IG2 relay. When the voltage value indicated by the IG signal from the certification ECU (smart key ECU assembly) equals to the voltage that is applied to the steering lock ECU (steering lock actuator assembly), the steering wheel will be unlocked. The steering lock ECU (steering lock actuator assembly) will not lock the steering wheel when power from the IG2 relay is present. This prevents the steering from being locked while the vehicle is moving.

Scheme 67

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.)

Scheme 68

1. CHECK VEHICLE CONDITION 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 --> See step 6 A: Go to next step
2. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. 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 - Check if steering unlock command reception is confirmed. OK "YES" is displayed on the Techstream. NG --> See step 8 OK: Go to next step
3. INSPECT STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) 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)) NG --> See step 4 OK --> See step 9
4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND) Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly). 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 ohms 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: Go to next step
5. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU) Disconnect the D43 connector from the power management control ECU. 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 ohms D17-3 (IGE) - Body ground Always 10 kohms 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) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE POWER MANAGEMENT CONTROL ECU
6. INSPECT STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) 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)) NG --> See step 7 OK --> See step 10
7. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU) Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly). Disconnect the D43 connector from the power management control ECU. 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 ohms D17-3 (IGE) - Body ground Always 10 kohms 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) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE POWER MANAGEMENT CONTROL ECU
8. CHECK SMART KEY SYSTEM (for Start Function). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-394794-S09294346702011040800000)
9. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-394617-S25928452032011040800000)
10. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-394617-S25928452032011040800000)

The unlock position sensor is one of the components comprising the steering lock ECU (steering lock actuator assembly). The sensor switch contact closes when the steering lock is released. The steering lock release signal is then sent to the power management control ECU. Upon receiving the signal, the ECU permits engine start. This prevents the engine from being started with the steering wheel locked.

Scheme 69

This circuit supplies power source voltage from the battery to terminal B of the steering lock ECU (steering lock actuator assembly). This is used as power source for the CPU, motor, communication, and peripheral circuits.

Scheme 70

Scheme 71

1. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND) Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly). 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 ohms 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: Go to next step
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D17-7 (B) - D17-1 (GND) Always 11 to 14 V 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 (STEERING LOCK ECU - BATTERY) OK --> See step 3
3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-394617-S25928452032011040800000)

See also:
• REMOVAL