Inspection Procedure A-4: Selector "P" position-linked door unlock function does not operate normally. <Vehicles with automatic transmission with keyless entry system>


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENT ON TROUBLE SYMPTOM
If the doors are not unlocked when the selector lever is shifted to the "P" position, the shift position signal input circuit(s) or the ETACS-ECU may be defective. Also, the function to interlock the shift P position with door unlocking may have been disabled with a customisation function.

POSSIBLE CAUSES

  • Malfunction of the ETACS-ECU
  • Damaged harness wires 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 .

STEP 2. Customize function by using the M.U.T.-III
Use the M.U.T.-III customisation function to confirm that "Inhibit" is set other than to "Operation".

  • Inhibit (Initial setting)
  • Operation

Q. Is the check result normal?
Go to Step 3.
Use the M.U.T.-III customisation function to set "Operation" (Refer to ).

STEP 3. M.U.T.-III CAN bus diagnostics
Using the M.U.T.-III, diagnose the CAN bus lines.

Q. Is the CAN bus normal?
Go to Step 4.
Correct the CAN bus line (Refer to GROUP 54C, Troubleshooting ).

STEP 4. M.U.T.-III other system diagnosis code
Check whether the A/T-ECU-related diagnosis code is set.

Q. Is the diagnosis code set?
Diagnose the A/T (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?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.