Inspection Procedure 5

Inspection Procedure 5: 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
- Damaged wiring harness and connectors
- Malfunction of the KOS-ECU
- Function setting error or no setting with a customization

DIAGNOSIS

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

(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."

(2)Turn the power supply mode of the engine switch to ON.

(3)Check whether the CAN bus lines related DTC is set.

(4)Turn the power supply mode of the engine switch to OFF.

Q. Is the DTC set?

YES Repair the CAN bus line Scan Tool Testing and Procedures).
NO Go to Step 2.
STEP 2. Using scan tool MB991958, read the diagnostic trouble code.

(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."

(2)Turn the power supply mode of the engine switch to ON.

(3)Check whether the KOS-ECU related DTC is set.

(4)Turn the power supply mode of the engine switch to OFF.

Q. Is the DTC set?

YES Diagnose the KOS-ECU. Refer to diagnostic trouble code chart 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 customization 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. 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 Codes Registration Procedure).
NO Go to Step 6.
STEP 6. Check of the troubles

Operate the lock/unlock switch and check that the door can be locked and unlocked.

Q. Is the check result normal?

YES The diagnosis is complete.
NO Replace KOS-ECU and register the ID codes (Refer to ID Codes Registration Procedure).