Unable to Unlock Steering Wheel (Engine cannot Start)
STEERING COLUMN: STEERING LOCK SYSTEM: Unable to Unlock Steering Wheel (Engine cannot Start)
- Unable to Unlock Steering Wheel (Engine cannot Start)
DESCRIPTION
The power management control ECU supplies the power to activate the motor of the steering lock actuator assembly.
The steering lock actuator activates the steering lock motor and moves the lock bar into the steering column to lock the steering wheel.
The steering lock may not release when the lock bar gets stuck in the lock hole of the steering column. In this case, if an engine start operation is performed while shaking the steering wheel in the same manner as is done for a vehicle with a mechanical key, the lock bar will release.
The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU as the steering lock ECU is not connected to the CAN communication system.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:
With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.
NOTICE:
* If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P, open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.
* When replacing the steering lock ECU, ID code box or certification ECU, registration must be performed Engine Immobiliser System (W/ Smart Key System).
PROCEDURE
1. CHECK ENGINE SWITCH (SWITCH CONDITION)
(a) Check the power source mode change.
(1) When the key is inside the vehicle and the shift lever is in P, check that pressing the engine switch causes the power source mode to change as follows:
OK:
off -> on (ACC) -> on (IG) -> off
NG -- GO TO SMART KEY SYSTEM (FOR START FUNCTION) (PROBLEM SYMPTOMS TABLE) Problem Symptoms Table
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (UNLOCK REQUEST RECEIVE)
(a) Use the Data List to check if the steering lock command is functioning properly.
Smart Key
OK:
The certification ECU receives an unlock request signal within 10 seconds of starting the engine, and OK is displayed on the Techstream screen.
NG -- READ VALUE USING TECHSTREAM (S CODE CHECK)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY AND BODY GROUND)
(a) Disconnect the F68 steering lock ECU connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT STEERING LOCK ECU (IGE VOLTAGE)
(a) Move the shift lever to P.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Disassembly
5. READ VALUE USING TECHSTREAM (S CODE CHECK)
(a) Use the Data List to check if the S code certification is functioning properly.
Smart Key
OK:
OK is displayed on the Techstream.
NG -- REPLACE ID CODE BOX
OK -- Continue to next step.
6. READ VALUE USING TECHSTREAM (L CODE CHECK)
(a) Use the Data List to check if the L code certification is functioning properly.
Smart Key
OK:
OK is displayed on the Techstream.
NG -- REPLACE ID CODE BOX
OK -- Continue to next step.
7. REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)
(a) Replace the steering lock actuator assembly (steering lock ECU) Disassembly.
NEXT -- Continue to next step.
8. CHECK STEERING LOCK RELEASE OPERATION
(a) Turn the engine switch on (IG).
(b) Operate the steering wheel and check the steering lock condition.
OK:
Steering lock is released.
NG -- REPLACE CERTIFICATION ECU Removal
OK -- END (STEERING LOCK ECU IS DEFECTIVE)
9. REPLACE ID CODE BOX
(a) Replace the ID code box Removal.
NEXT -- Continue to next step.
10. READ VALUE USING TECHSTREAM (S CODE CHECK)
(a) Use the Data List to check if the S code certification is functioning properly.
Smart Key
OK:
OK is displayed on the Techstream.
NG -- REPLACE CERTIFICATION ECU Removal
OK -- END (ID CODE BOX IS DEFECTIVE)
11. REPLACE ID CODE BOX
(a) Replace the ID code box Removal.
NEXT -- Continue to next step.
12. READ VALUE USING TECHSTREAM (L CODE CHECK)
(a) Use the Data List to check if the L code certification is functioning properly.
Smart Key
OK:
OK is displayed on the Techstream.
NG -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Disassembly
OK -- END (ID CODE BOX IS DEFECTIVE)