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INSPECTION PROCEDURE A-4: Ignition "LOCK (OFF)" position-linked door unlock function does not operate.
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)
 
 
 
 
 
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 customization function.
 
 
 
PROBABLE CAUSES
  • Malfunction of CAN bus line
  • Malfunction of ETACS-ECU
  • Malfunction of ignition switch
  • Damaged wiring harness and connectors
 
 
 
 
DIAGNOSIS
STEP 1. Checking central door unlocking operation
Check that the central door locking system works normally.
Is the check result normal?
Go to Step 2.
Refer to Central Door Locking System Symptom Chart .
 
STEP 2. Check the customization function.
Check that "Always (Lock pos)" is set for "Auto door unlock by ignition LOCK position" with the customization function.
Is the check result normal?
Go to Step 3.
Set "Always (Lock pos)" for "Auto door unlock by ignition LOCK position" with the customization function (Refer to customization Function ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check CAN bus for diagnostic trouble code.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to GROUP 42B, "How to connect scan tool (M.U.T.-IIISE) ."
(2) Turn the ignition switch to the "ON" position.
(3) Check whether CAN bus lines related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
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.
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" (OFF) position unlocks tall doors.
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.