Steering Lock System (Diagnostic Codes & Circuit Tests): Overview Toyota Highlander II рестайлинг

DESCRIPTION

If the steering lock ECU determines that there is a malfunction inside the ECU, it outputs this DTC. The steering lock ECU diagnosis information cannot be read directly from the steering lock ECU by the tester. The diagnosis information from the steering lock ECU is transmitted to the tester via the certification ECU (smart key ECU assembly) using the Controller Area Network (CAN).

The steering lock ECU activates the steering lock motor by the power from the main body ECU (*) through the IGE circuit. This prevents the steering from being locked while the vehicle is moving.

The diagnosis information of the steering lock ECU is transmitted to the tester via the certification ECU (smart key ECU assembly) as the steering lock ECU is not connected to the CAN communication system.

HINT

*: The power source control ECU is not a physical part. This code refers to the power source control function performed by the main body ECU.

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The steering lock ECU determines the on/off status of the engine switch through the IG2 signal circuit.

After receiving an IG2 relay ON signal, the steering lock ECU determines that the vehicle is moving. The steering lock ECU does not lock the steering when it receives the IG2 relay ON signal. This prevents the steering from being locked while the vehicle is moving.

The diagnosis information of the steering lock ECU is transmitted to the tester via the certification ECU (smart key ECU assembly) as the steering lock ECU is not connected to the CAN communication system.

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The steering lock ECU is connected to the main body ECU and certification ECU (smart key ECU assembly). The steering lock ECU cannot activate the motor unless it receives permission signals from both ECUs. (The main body ECU permits the steering lock ECU to supply power to activate the motor.)

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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 Turn the engine switch off. Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn Techstream on. Enter the following menus: Body Electrical / Smart Access / Data List. Select the item below in the Data List, and read its value displayed on Techstream. SMART ACCESS: 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 a steering unlock command signal has been received. OK "YES" is displayed on the tester display. NG --> See step 8 OK: Go to next step
3. INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition D11-3 (IGE) - D11-1 (GND) Engine switch off Engine switch on (ACC or IG) Motor activated: Below 1 V Motor not activated: 11 to 14 V NG --> See step 4 OK --> See step 9
4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D11 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition D11-1 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU) Disconnect the D8 connector from the main body ECU. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition D11-3 (IGE) - D8-19 (SLR+) Always Below 1 ohms D11-3 (IGE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU
6. INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition D11-3 (IGE) - D11-1 (GND) The specified condition should be checked after performing the following: Move the shift lever to the N position Turn the engine switch off Open the driver's door Motor activated: Below 1 V Motor not activated: 11 to 14 V NG --> See step 7 OK --> See step 9
7. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU) Disconnect the D11 connector from the steering lock actuator assembly. Disconnect the D8 connector from the main body ECU. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition D11-3 (IGE) - D8-19 (SLR+) Always Below 1 ohms D11-3 (IGE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU
8. CHECK SMART KEY SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-422490-S09330679052011092600000)
9. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-422295-S26523497062011092600000)

The unlock position sensor is one of the components of the 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 main body ECU. Receiving the signal, the ECU permits engine start. (This prevents the engine from being started with the steering locked.)

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1. INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition D11-4 (SLP1) - D11-2 (SGND) Engine switch off Engine switch on (ACC or IG) Below 1 V NG --> See step 2 OK --> See step 3
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU) Disconnect the D11 connector from the steering lock actuator assembly. Disconnect the D8 connector from the main body ECU. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition D11-4 (SLP1) - D8-18 (SLP) Always Below 1 ohms D11-4 (SLP1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
3. CHECK SMART KEY SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-422490-S09330679052011092600000)
4. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-422295-S26523497062011092600000)

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

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1. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D11 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition D11-1 (GND) - Body ground Always Below 1 ohms D11-2 (SGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY) Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition D11-7 (B) - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY) OK --> See step 3
3. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-422295-S26523497062011092600000)