INSPECTION PROCEDURE A-4: Selector "P" position-linked door unlock function does not operate.

  • Before replacing the ECU, ensure that the power supply circuit, the earth 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 .)


ETACS-ECU determines whether the shift position is at "P" or not according to the shift position signal which is sent by CVT-ECU.


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 customisation function.



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 "Always (P pos)" is set for "Auto door unlock by P position" with the customisation function.

Q. Is the check result normal?

Go to Step 3.

Set "Always (P pos)" for "Auto door unlock by P position" 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 M.U.T.-III Diagnosis code of other systems

Check that CVT sets a diagnosis code.

Q. Is the diagnosis 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.

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 ETACS-ECU.