Steering Column (Hybrid): Overview Toyota Highlander II

SYSTEM DESCRIPTION

1. DESCRIPTION The steering lock system locks or unlocks the steering by activating the steering bar with a motor. The steering lock ECU activates the motor based on signals from the certification ECU (smart key ECU assembly) and main body ECU. A LIN (Local Interconnect Network) is used for communication between different ECUs in this system.
2. FUNCTIONS OF COMPONENTS The steering lock ECU controls the system based on information from the following components: FUNCTIONS OF COMPONENTS Item Function Steering lock actuator assembly Consists of a motor, lock bar, lock and unlock position sensors, etc. Activated by the steering lock ECU. Steering lock ECU Included in the steering lock actuator assembly. This ECU activates the steering lock motor based on permission signals from the main body ECU and certification ECU (smart key ECU assembly). Detects steering lock or unlock state and transmits this status to other ECUs. Main body ECU Permits the steering lock ECU to supply power to activate the motor. The main body ECU and certification ECU (smart key ECU assembly) permit engine start after receiving an unlock signal from the steering lock ECU. Certification ECU (Smart key ECU assembly) Orders the steering lock ECU to lock / unlock the steering. The main body ECU and certification ECU (smart key ECU assembly) permit engine start after receiving an unlock signal from the steering lock ECU. IG2 relay Controlled by the main body ECU. This ECU sends IG signals to the steering lock ECU. ID Code Box (Immobiliser code ECU) Transmits command to set or cancel immobiliser to the ECM based on permission signals from the certification ECU (smart key ECU assembly).

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).

DTC DETECTION CONDTION CHART

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.

DTC DETECTION CONDTION CHART

Power Source Control ECU Malfunction Wiring Diagram. Scheme 83

The steering lock ECU determines the on/off status of the power 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.

DTC DETECTION CONDTION CHART

IG2 Signal Malfunction Wiring Diagram. Scheme 84

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.)

Steering Lock Motor Drive Power Wiring Diagram. Scheme 85

Scheme 86

Scheme 87

Scheme 88

Scheme 89

Scheme 90

1. CHECK VEHICLE CONDITION Check the problem symptom of the steering lock system. Result RESULT CHART Condition Proceed to Steering lock cannot be released A Steering cannot be locked B B: Go to step 6 A: Go to next step
2. READ VALUE USING TECHSTREAM Turn the power switch off. Connect Techstream to the DLC3. Turn the power 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: SMART ACCESS REFERENCE CHART 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: CHECK SMART KEY SYSTEM (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-305556-S20094058532008112800000) ) 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 SPECIFIED CONDITION REFERENCE CHART Tester Connection Switch Condition Specified Condition D11-3 (IGE) - D11-1 (GND) Power switch off Power switch on (ACC or IG) Motor activated: Below 1 V Motor not activated: 11 to 14 V NG: Go to step 4 (Scheme 86): Identifying D11 Steering Lock ECU Connector Terminals OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-305532-S28957162962008112800000) )
4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D11 connector from the steering lock actuator assembly. (Scheme 87): Identifying D11 Steering Lock Actuator Assembly Connector Terminals Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART 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. (Scheme 88): Identifying D8 Main Body ECU Connector Terminals Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART 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 SPECIFIED CONDITION REFERENCE CHART 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 power switch off Open the driver's door Motor activated: Below 1 V Motor not activated: 11 to 14 V NG: Go to step 7 (Scheme 89): Identifying D11 Steering Lock ECU Connector Terminals OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-305532-S28957162962008112800000) )
7. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU) Disconnect the D11 connector from the steering lock actuator assembly. (Scheme 90): Identifying D11 Steering Lock Actuator Assembly And D8 Main Body ECU Connector Terminals 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 SPECIFIED CONDITION REFERENCE CHART 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

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.)

Unlock Position Sensor Signal Wiring Diagram. Scheme 91

Scheme 92

Scheme 93

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 SPECIFIED CONDITION REFERENCE CHART Tester Connection Switch Condition Specified Condition D11 - 4 (SLP1) - D11-2 (SGND) Power switch off Power switch on (ACC or IG) Below 1 V NG: Go to step 2 (Scheme 92): Identifying D11 Steering Lock ECU Connector Terminals OK: CHECK SMART KEY SYSTEM (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-305556-S20094058532008112800000) )
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU) Disconnect the D11 connector from the steering lock actuator assembly. (Scheme 93): Identifying D11 Steering Lock Actuator Assembly And D8 Main Body ECU Connector Terminals 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 SPECIFIED CONDITION REFERENCE CHART 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: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-305532-S28957162962008112800000) )

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.

Power Source Wiring Diagram. Scheme 94

Scheme 95

Scheme 96

1. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the D11 connector from the steering lock actuator assembly. (Scheme 95): Identifying D11 Steering Lock Actuator Assembly Connector Terminals Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART 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 SPECIFIED CONDITION REFERENCE CHART 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) (Scheme 96): Identifying D11 Steering Lock ECU Connector Terminals OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-305532-S28957162962008112800000) )

Identifying Steering Column Assembly Components With Torque Specifications (1 Of 7). Scheme 97

Identifying Steering Column Assembly Replacement Components With Torque Specifications (2 Of 7). Scheme 98

Identifying Steering Column Assembly Replacement Components With Torque Specifications (3 Of 7). Scheme 99

Identifying Steering Column Assembly Components With Torque Specifications (4 Of 7). Scheme 100

Identifying Steering Column Assembly Components With Torque Specifications (5 Of 7). Scheme 101

Identifying Steering Column Assembly Components With Torque Specifications (6 Of 7). Scheme 102

Identifying Steering Column Assembly Components With Torque Specifications (7 Of 7). Scheme 103

See also:
• PRECAUTION
• REMOVAL
• REMOVAL