Steering Lock (Diagnostic Codes & Circuit Tests): Overview Toyota Avalon XX30 рестайлинг 2

DESCRIPTION

If the steering lock ECU determines that there is a malfunction inside the ECU, it outputs this DTC.

Diagnostic communication between the steering lock ECU and Techstream is performed via the certification ECU as the steering lock ECU is not connected to the BEAN.

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

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1. INSPECT STEERING LOCK ACTUATOR ASSEMBLY Measure the voltage according to the value(s) in the table below. Voltage Tester connection (Symbols) Condition Specified condition D14-3 (IGE) - D14-2 (SGND) Engine switch off Turn the engine switch on (ACC or IG) Motor active: Below 1 V Motor not active: 10 to 12 V D14-3 (IGE) - D14-2 (SGND) Adjust the shift lever to the P position Turn the engine switch off Open the driver's door Motor active: Below 1 V Motor not active: 10 to 12 V HINT: The steering lock ECU and steering lock actuator assembly are supplied as a unit. OK --> REPLACE STEERING LOCK ACTUATOR ASSEMBLY NG: Go to next step
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D14 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Resistance Tester connection (Symbols) Condition Specified condition D14-2 (SGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU) Disconnect the D44 connector from the power source control ECU. Measure the resistance according to the value(s) in the table below. Resistance Tester connection (Symbols) Condition Specified condition D14-3 (IGE) - D44-32 (SLR+) Always Below 1 ohms D14-3 (IGE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE POWER SOURCE CONTROL ECU

The steering lock ECU receives IG2 relay signals. Receiving the signals, the steering lock ECU determines that the vehicle is moving. The steering lock ECU does not lock the steering when it receives an IG2 relay ON signal (to prevent the steering from being locked while the vehicle is moving).

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1. INSPECT IGNITION RELAY NO. 2 Remove the IG2 relay from the engine room R/B. Measure the resistance according to the value(s) in the table below. Resistance Tester connection Specified condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG --> REPLACE IGNITION RELAY NO. 2 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D14 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Resistance Tester connection (Symbols) Condition Specified condition D14-1 (GND) - Body ground Always Below 1 ohms D14-2 (SGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY) Measure the voltage according to the value(s) in the table below. Voltage Tester connection (Symbols) Condition Specified condition D14-6 (IG2) - D14-1 (GND) Engine switch on (IG) 10 to 14 V D14-6 (IG2) - D14-2 (SGND) Engine switch on (IG) 10 to 14 V Measure the resistance according to the value(s) in the table below. Resistance Tester connection (Symbols) Condition Specified condition *D14-6 (IG2) - D14-7 (B) Engine switch off 10 kohms or higher *: This measurement is performed with the engine switch off to check for a battery voltage short in the IG2 circuit. OK --> REPLACE STEERING LOCK ACTUATOR ASSEMBLY NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)

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 obtains permission from both the ECUs. (The power source control ECU assembly permits the steering lock ECU to supply power to activate the motor.)

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1. CHECK 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 5 A: Go to next step
2. INSPECT STEERING LOCK ACTUATOR ASSEMBLY Measure the voltage according to the value(s) in the table below. Voltage Tester Connection (Symbols) Condition Specified Condition D14-3 (IGE) - D14-2 (SGND) Engine switch off Turn the engine switch on (ACC or IG) Motor active: Below 1 V Motor not active: 10 to 12 V OK --> PROCEED TO «PROBLEM SYMPTOMS TABLE»(ref-428940-S25796144622011101200000) NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D14 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Resistance Tester Connection (Symbols) Condition Specified Condition D14-2 (SGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU) Disconnect the D44 connector from the power source control ECU. Measure the resistance according to the value(s) in the table below. Resistance Tester Connection (Symbols) Condition Specified Condition D14-3 (IGE) - D44-32 (SLR+) Always Below 1 ohms D14-3 (IGE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE POWER SOURCE CONTROL ECU
5. INSPECT STEERING LOCK ACTUATOR ASSEMBLY Measure the voltage according to the value(s) in the table below. Voltage Tester Connection (Symbols) Condition Specified Condition D14-3 (IGE) - D14-2 (SGND) Adjust the shift lever to the P position Turn the engine switch off Open the driver side door Motor active: Below 1 V Motor not active: 10 to 12 V OK --> PROCEED TO «PROBLEM SYMPTOMS TABLE»(ref-428940-S25796144622011101200000) NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
6. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D14 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Resistance Tester Connection (Symbols) Condition Specified Condition D14-2 (SGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU) Disconnect the D44 connector from the power source control ECU. Measure the resistance according to the value(s) in the table below. Resistance Tester Connection (Symbols) Condition Specified Condition D14-3 (IGE) - D44-32 (SLR+) Always Below 1 ohms D14-3 (IGE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE POWER SOURCE CONTROL ECU

The unlock position sensor is one of the components comprising the steering lock actuator. The sensor switch contact closes when the steering lock is released. The steering lock release signal is then sent to the power source control 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 Measure the voltage according to the value(s) in the table below. Voltage Tester Connection (Symbols) Condition Specified Condition D14-4 (SLP1) - D14-2 (SGND) Engine switch off Turn the engine switch on (ACC or IG) Below 1 V OK --> CHECK PUSH BUTTON START SYSTEM NG: Go to next step
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU) Disconnect the D14 connector from the steering lock actuator assembly. Disconnect the D44 connector from the power source control ECU. Measure the resistance according to the value(s) in the table below. Resistance Tester Connection (Symbols) Condition Specified Condition D14-4 (SLP1) - D44-26 (SLP) Always Below 1 ohms D14-4 (SLP1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE STEERING LOCK ACTUATOR ASSEMBLY

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

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1. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D14 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Resistance Tester connection (Symbols) Condition Specified condition D14-1 (GND) - Body ground Always Below 1 ohms D14-2 (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. Voltage Tester connection (Symbols) Condition Specified condition D14-7 (B) - D14-1 (GND) Always 10 to 14 V D14-7 (B) - D14-2 (SGND) Always 10 to 14 V OK --> PROCEED TO «PROBLEM SYMPTOMS TABLE»(ref-428940-S25796144622011101200000) NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)