Steering Column: Overview Toyota Camry XV40

SYSTEM DESCRIPTION

1. DESCRIPTION The steering lock system locks or unlocks the steering lock by activating the steering lock bar with a motor. The steering lock ECU activates the motor based on signals from the certification ECU 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. ITEM FUNCTION CHART 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. 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 permit engine start after receiving an unlock signal from the steering lock ECU. Certification ECU Orders the steering lock ECU to lock / unlock the steering. The main body ECU and certification ECU 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.

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 to the tester using the controller area network (CAN).

DTC DETECTING CONDITION

The main body ECU (*) controls the power supply to activate the steering lock motor. This prevents the steering from being locked while the vehicle is moving.

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 DETECTING CONDITION

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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 STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Tester connection (Symbols) Condition Specified condition E51-3(IGE)-E51-1 (GND) The specified condition should be checked after performing the following: Engine switch off Turn the engine switch on (ACC or IG) Motor activated: Below 1 V Motor not activated: 10 to 12 V E51-3(IGE)-E51-1 (GND) The specified condition should be checked after performing the following: Move the shift lever to the P position Turn the engine switch off Open the driver's door Motor activated: Below 1 V Motor not activated: 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 (STEERING LOCK ECU) NG: Go to next step.
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the E51 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Standard resistance STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND Tester connection (Symbols) Condition Specified condition E51-1 (GND)-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 - MAIN BODY ECU) Disconnect the E7 connector from the main body ECU. Measure the resistance according to the value(s) in the table below. Standard resistance STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU Tester connection (Symbol*) Condition Specified condition E51-8(IGE)-E7-19 (SLR+) Always Below 1 ohms E51-3 (IGE)-Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MAIN BODY ECU

The steering lock ECU receives power from the IG2 relay. When the digital signal from the certification ECU and the voltage from the IG2 relay are received by the steering lock ECU, the steering will be unlocked. The steering lock ECU will not lock the steering when power from the IG2 relay is present (this prevents the steering from being locked while the vehicle is moving).

DTC DETECTING CONDITION

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1. INSPECT IG2 RELAY Remove the IG2 relay from the engine room R/B. Measure the resistance according to the value(s) in the table below. Standard resistance IG2 RELAY Tester Connection Specified Condition 3-5 10 kohms or higher 3-S Below 1 ohms (When battery voltage Is applied to terminals 1 and 2) NG: REPLACE IG2 RELAY OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the E51 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Standard resistance STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND Tester connection (Symbols) Condition Specified condition E51-1(GND)-Body ground Always Below 1 ohms E51-2 (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. Standard voltage STEERING LOCK ACTUATOR ASSEMBLY BATTERY VOLTAGE Tester connection (Symbols) Condition Specified condition E51-6(IG2)-E51-1 (GND) Engine switch on (IG) 10 to 14 V E51-6(IG2)-E51-2 (SGND) Engine switch on (IG) 10 to 14 V Measure the resistance according to the value(s) in the table below. Standard resistance STEERING LOCK ACTUATOR ASSEMBLY BATTERY RESISTANCE Tester connection (Symbols) Condition Specified condition *E51-6(IG2)-E51-7(B) Engine switch off 10 kohms or higher *: This measurement is performed with the engine switch off to check for a short between IG2 and battery voltage. OK: REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY -BATTERY)

The steering lock ECU is connected to the main body ECU and certification ECU. 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.)

The unlock position sensor is one of the components in 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 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 STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Tester connection (Symbols) Condition Specified condition E51-4(SLP1)-E51-2 (SGND) Engine switch off Turn the engine switch on (ACC or IG) Below 1V OK: CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START NG: Go to next step.
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU) Disconnect the E51 connector from the steering lock actuator assembly. Disconnect the E7 connector from the main body ECU. Measure the resistance according to the value(s) in the table below. Standard resistance STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU Tester connection (Symbols) Condition Specified condition E51-4 (SLP1) - E7-18 (SLP) Always Below 1 ohms E51-4 (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

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 CPU, motor, communication, and peripheral circuits.

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1. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the E51 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Standard resistance STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND Tester connection (Symbols) Condition Specified condition E51-1 (GND) - Body ground Always Below 1 ohms E51-2 (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 STEERING LOCK ACTUATOR ASSEMBLY BATTERY Tester connection (Symbols) Condition Specified condition E51-7 (B) - E51-1 (GND) Always 10 to 14 V E51-7 (B) - E51-2 (SGND) Always 10 to 14 V OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)

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1. PRECAUTION HINT: (See «PRECAUTION»(/toyota/camry/xv40-2006-2009/remont/airbag/#supplemental-restraint-system-except-hybrid) )
2. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL HINT: (See «PRECAUTION»(/toyota/camry/xv40-2006-2009/remont/airbag/#supplemental-restraint-system-except-hybrid) )
4. REMOVE FRONT WHEEL LH
5. REMOVE FRONT DOOR SCUFF PLATE LH (See «REMOVAL»(/toyota/camry/xv40-2006-2009/remont/exteriorinterior-trim/#interior) )
6. REMOVE COWL SIDE TRIM SUB-ASSEMBLY LH (See «REMOVAL»(/toyota/camry/xv40-2006-2009/remont/exteriorinterior-trim/#interior) )
7. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL LH (for TMC Made) (See «REMOVAL»(/toyota/camry/xv40-2006-2009/remont/gauges-instrument-panels/#instrument-panel) )
8. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL LH (for TMMK Made) (See «REMOVAL»(/toyota/camry/xv40-2006-2009/remont/gauges-instrument-panels/#instrument-panel) )
9. REMOVE DRIVER SIDE KNEE AIRBAG ASSEMBLY (See «REMOVAL»(/toyota/camry/xv40-2006-2009/remont/airbag/#supplemental-restraint-system-except-hybrid) )
10. REMOVE NO. 2 LOWER STEERING WHEEL COVER (See «REMOVAL»(/toyota/camry/xv40-2006-2009/remont/airbag/#supplemental-restraint-system-except-hybrid) )
11. REMOVE NO. 3 LOWER STEERING WHEEL COVER (See «REMOVAL»(/toyota/camry/xv40-2006-2009/remont/airbag/#supplemental-restraint-system-except-hybrid) )
12. REMOVE STEERING PAD (See «REMOVAL»(/toyota/camry/xv40-2006-2009/remont/airbag/#supplemental-restraint-system-except-hybrid) )
13. REMOVE STEERING WHEEL ASSEMBLY Remove the steering wheel assembly set nut. Put matchmarks on the steering wheel assembly and the steering main shaft. Disconnect the connectors from the spiral cable. Using SST, remove the steering wheel assembly. SST 09950-50013 (09951 -05010, 09952-05010, 09953-05020, 09954-05031)
14. REMOVE STEERING COLUMN COVER Remove the 2 screws. Disengage the 2 claws to remove the lower steering column cover. Disengage the claw to remove the upper steering column cover.
15. REMOVE TURN SIGNAL SWITCH ASSEMBLY WITH SPIRAL CABLE SUB-ASSEMBLY Disconnect the connectors from the turn signal switch assembly with spiral cable sub-assembly. Using pliers, grip the claws of the clip and remove the turn signal switch assembly with spiral cable sub-assembly.
16. REMOVE NO. 1 AIR DUCT Disengage the 2 claws and remove the No. 1 air duct.
17. REMOVE STEERING COLUMN ASSEMBLY (for TMC Made) Remove the clamp from the steering column hole shield. Remove the bolt and slide the steering intermediate shaft assembly. NOTE: Do not separate the steering intermediate shaft assembly from the power steering link assembly. Put matchmarks on the steering intermediate shaft assembly and the power steering link assembly. Separate the steering intermediate shaft assembly from the power steering link assembly. Disconnect the connectors and wire harness clamps from the steering column assembly. Remove the bolt, 2 nuts, and the steering column assembly.
18. REMOVE STEERING POST ASSEMBLY (for TMMK Made) Remove the clamp from the steering column hole shield. Remove the bolt and slide the steering sliding yoke. NOTE: Do not separate the steering sliding yoke from the power steering link assembly. Put matchmarks on the steering sliding yoke and the power steering link assembly. Separate the steering sliding yoke from the power steering link assembly. Disconnect the connectors and wire harness clamps from the steering column assembly. Remove the bolt, 2 nuts, and the steering post assembly.
19. REMOVE STEERING INTERMEDIATE SHAFT ASSEMBLY (for TMC Made) Put matchmarks on the steering intermediate shaft assembly and the steering column assembly. Remove the bolt and the steering intermediate shaft assembly from the steering column assembly.

See also:
• PRECAUTION
• REMOVAL
• REMOVAL