Inspection Procedure 8

Inspection Procedure 8: No door will be locked or unlocked by operating a lock/unlock switch on any door.

CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

TROUBLESHOOTING HINTS

- Malfunction of the CAN bus lines
- Malfunction of the central door locking system
- Malfunction of the keyless operation key
- Malfunction of the key reminder switch
- Damaged wiring harness and connectors
- Malfunction of the KOS-ECU
- Function setting error or no setting with a customization

DIAGNOSIS

Required Special Tools:

- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, read CAN bus diagnostic trouble code.

(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes".
(2)Turn the ignition switch to the "ON" position.
(3)Check whether the KOS-ECU related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the KOS-ECU. Refer to Keyless Operation System (KOS).

NO Go to Step 3.

STEP 3. Check the central door locking operation

Check that the central door locking system works normally.

Q. Is the check result normal?

YES Go to Step 4.
NO Perform troubleshooting for the central door locking system Symptom Chart).
STEP 4. Check the customize function.

Check that either of the followings other than "ENG start enable" or "Both disabled" are set for "KOS feature" with the customization function.

- Both enable
- Door Entry enable

Q. Is the check result normal?

YES Go to Step 5.
NO Set either of the followings other than "ENG start enable" or "Both disabled" for
"KOS feature" with the customization function (Refer to Configuration Function).
STEP 5. Key reminder switch check

(1)Disconnect the C-315 ETACS-ECU connector.

(2)Measure the resistance at the harness-side connector with the ignition key removed from the ignition key cylinder.

(3)Check the continuity between the C-315 ETACS-ECU connector terminal No. 13 and the ground.
OK: Continuity exists (2ohms or less)

Q. Is the check result normal?

YES Go to Step 6.

NO Check the C-211 key reminder switch connector, the C-315 ETACS-ECU connector, the wiring harness between the C-211 key reminder switch connector (terminal No. 3) and the C-315 ETACS-ECU connector (terminal No. 13), and between the C-211 key reminder switch connector
(terminal No. 2) and the ground. If they are normal, replace the key reminder switch.

STEP 6. Check with another registered keyless operation key.

Q. Does the IG knob turn? (Is the keyless operation key recognized?)

YES Replace the keyless operation key with which the IG knob does not turn (no recognition) and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table).
NO Go to Step 7.
STEP 7. Check of the troubles

Operate the lock switch and check that the door can be locked and unlocked. Also, check that the unlock sensor can lock and unlock the door.

Q. Is the check result normal?

YES The diagnosis is complete.
NO Replace KOS-ECU and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table).