[Previous][Next]
INSPECTION PROCEDURE A-3: Selector "P" 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 ).
 
 
 
 
 
OPERATION
ETACS-ECU determines whether the shift position is at "P" or not according to the shift position signal which is sent by CVT-ECU.
 
 
 
COMMENTS ON TROUBLE SYMPTOM
If the doors are not unlocked when the selector lever is shifted to the P position, a malfunction of the shift position signal input circuit(s) or ETACS-ECU is suspected. Also, the selector "P" position-linked door unlock function may have been "disabled" with the customization function.
 
 
 
PROBABLE CAUSES
  • Malfunction of CAN bus line
  • Malfunction of ETACS-ECU
  • 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 (P pos)" is set for "Auto door unlock by P position" with the customization function.
Is the check result normal?
Go to Step 3.
Set "Always (P pos)" for "Auto door unlock by P 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 scan tool (M.U.T.-IIISE) Diagnostic trouble code of other systems.
Check whether CVT sets a diagnostic trouble code.
Is the diagnostic trouble code set?
Diagnose CVT (Refer to GROUP 23A, Troubleshooting ).
Go to Step 5.
 
STEP 5. Retest the system.
Check that shifting the selector lever to the P position unlocks the 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 ETACS-ECU.