INSPECTION PROCEDURE 4: Ignition "LOCK (OFF)" position-linked door unlock function does not operate <Vehicles for General Export (without keyless operation system)>.
caution
Before replacing the ECU, ensure that the input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If a door is not unlocked when the ignition switch is turned to the LOCK position, a malfunction of the CAN bus line, ignition switch or ETACS-ECU is suspected. Also, the ignition "LOCK" position-linked door unlock function may have been "Disabled" with the customisation function.
PROBABLE CAUSES
Malfunction of CAN bus line
Malfunction of ETACS-ECU
Malfunction of ignition switch
Damaged wiring harness and connectors
DIAGNOSIS PROCEDURE
STEP 1. Checking central door unlocking operation
Check that the central door locking system works normally.
Q.
Is the check result normal?
Go to Step 2.
Refer to Central Door Locking System Symptom Chart .
STEP 2. Check the customisation function.
Check that "Enable" is set for "Door unlock function by IG lock" with the customisation function.
Q.
Is the check result normal?
Go to Step 3.
Set "Enable" for "Door unlock function by IG lock" with the customisation function (Refer to Customisation Function ).
STEP 3. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the CAN bus normal?
Go to Step 4.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
STEP 4. Check the ignition switch.
Check that the ignition switch works normally.
Q.
Is the check result normal?
Go to Step 5.
Repair the ignition switch (Refer to GROUP 54A - Ignition Switch Continuity Check ).
STEP 5. Retest the system.
Check that turning the ignition switch to the LOCK position unlocks tall doors.
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS, ETACS-ECU ).