Inspection Procedure 8

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

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 function

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.

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.







1. Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III). How To Connect The Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Check whether the CAN bus lines related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q : Is the DTC set?

YES : Repair the CAN bus line.

NO : Go to Step 2.

STEP 2. Using scan tool MB991958, read the diagnostic trouble code.

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.







1. Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)." How To Connect The Scan Tool (M.U.T.-III)
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. Diagnostic Trouble Code Descriptions

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 (Refer to - Door - Troubleshooting). Symptom Chart

STEP 4. Check the customization function.

Check that either of the followings other than "ENG strt 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 strt enable" or "Both disabled" for "KOS feature" with the customization function. Programming and Relearning

STEP 5. Using scan tool MB991958, check data list.

Check the signals related to the door entry operation.

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.







1. Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)." How to Connect the Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Check the ETACS data list.
- Remove the ignition key from the ignition key cylinder.







OK: Normal condition is displayed.

Q : Is the check result normal?

YES : Go to Step 6.

NO : Refer to, Inspection Procedure 3: ETACS-ECU does not receive any signal from the key reminder switch. Inspection Procedure 3

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. 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. ID Codes Registration Judgement Table