DESCRIPTION
The steering lock ECU sends an unlock position signal to the power management control ECU. On receiving the signal, the power management control ECU permits an engine start. This prevents the engine from being started with the steering locked.
The steering lock actuator activates the steering lock motor and moves the lock bar into the steering column to lock the steering wheel.
When the steering lock is operating, the steering lock may not lock when the lock bar is not aligned with the lock hole of the steering column. In this case, the steering lock can be locked by turning the steering wheel a little in the same manner as is done for a vehicle with a mechanical key to change the position of the lock hole.
The diagnosis information of the steering lock ECU is transmitted to the intelligent tester via the certification ECU as the steering lock ECU is not connected to the CAN communication system.
WIRING DIAGRAM
*a | Power Management Control ECU |
*b | Steering Lock Actuator Assembly (Steering Lock ECU) |
CAUTION / NOTICE / HINT
Tech Tips
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.
Note
If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off, 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. Refer to the Service Bulletin for the registration procedure.
PROCEDURE
READ VALUE USING INTELLIGENT TESTER (LOCK REQUEST RECEIVE)
Use the Data List to check if the steering lock command is functioning properly.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
Lock Request Receive | Steering lock lock command reception status/NG or OK | NG: Lock request not received OK: Lock request received |
- |
OK |
---|
The certification ECU receives a lock request signal within 10 seconds of turning the engine switch from on (IG) to off and opening a door, and OK is displayed on the intelligent tester screen. |
NG |
READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE DOOR COURTESY SWITCH) Click here |
OK |
INSPECT STEERING LOCK ECU (IGE VOLTAGE)
*1 | Component with harness connected (Steering Lock ECU) |
Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU) |
OK |
CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU)
Disconnect the D111 power management control ECU connector.
*1 | Rear view of wire harness connector (to Power Management Control ECU) |
*2 | Front view of wire harness connector (to Steering Lock ECU) |
Disconnect the D57 steering lock ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
OK |
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE DOOR COURTESY SWITCH)
Use the Data List to check if the driver side door courtesy switch is functioning properly.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
D Door Courtesy SW | Driver side door courtesy switch condition/ON or OFF | ON: Driver side door courtesy switch on OFF: Driver side door courtesy switch off |
- |
OK |
---|
Driver side door courtesy switch is functioning properly. |
NG |
GO TO LIGHTING SYSTEM (DOORCOURTESY SWITCH CIRCUIT) Click here |
OK |
READ VALUE USING INTELLIGENT TESTER (S CODE CHECK)
Use the Data List to check if the S code certification is functioning properly.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
S Code Check | S code certification result/NG or OK | OK: S code certification result normal NG: S code certification result abnormal |
- |
OK |
---|
OK is displayed on the intelligent tester. |
NG |
REPLACE ID CODE BOX Click here |
OK |
READ VALUE USING INTELLIGENT TESTER (L CODE CHECK)
Use the Data List to check if the L code certification is functioning properly.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
L Code Check | L code certification result/NG or OK | OK: L code certification result normal NG: L code certification result abnormal |
- |
OK |
---|
OK is displayed on the intelligent tester. |
NG |
REPLACE ID CODE BOX Click here |
OK |
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)
Replace the steering lock actuator assembly (steering lock ECU) Click here.
NEXT |
CHECK STEERING LOCK RELEASE OPERATION
Turn the engine switch on (IG).
Operate the steering wheel and check the steering lock condition.
OK |
---|
Steering lock is released. |
OK |
END (STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) IS DEFECTIVE) |
NG |
REPLACE CERTIFICATION ECU |
REPLACE ID CODE BOX
Replace the ID code box.
NEXT |
READ VALUE USING INTELLIGENT TESTER (S CODE CHECK)
Use the Data List to check if the S code certification is functioning properly.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
S Code Check | S code certification result/NG or OK | OK: S code certification result normal NG: S code certification result abnormal |
- |
OK |
---|
OK is displayed on the intelligent tester. |
OK |
END (ID CODE BOX IS DEFECTIVE) |
NG |
REPLACE CERTIFICATION ECU |
REPLACE ID CODE BOX
Replace the ID code box.
NEXT |
READ VALUE USING INTELLIGENT TESTER (L CODE CHECK)
Use the Data List to check if the L code certification is functioning properly.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
L Code Check | L code certification result/NG or OK | OK: L code certification result normal NG: L code certification result abnormal |
- |
OK |
END (ID CODE BOX IS DEFECTIVE) |
NG |
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here |