Inspection Procedure 14: The welcome light function does not work normally: Diagnosis

WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, Check the configuration function.
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) ."
2. Turn the ignition switch to the "ON" position.
3. Check that any one of the followings other than "Disabled" is set for "Welcome light" with a customization function.
  - Small light
  - Head light
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is it set to other than "Disabled"?
1. YES: Go to Step 2.
2. NO: Set "Welcome light" to any one other than "Disabled" with a customization function (Refer to CUSTOMIZATION FUNCTION ).
  
  Fig 1: Identifying Special Tools
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code
1. Turn the ignition switch to the "ON" position.
2. Check whether the ETACS-ECU DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES: Diagnose the ETACS-ECU. (Refer to DIAGNOSIS )
2. NO: Go to Step 3.
STEP 3. Check the keyless entry system operation
Check that the keyless entry system operation normally.

Q: Is the check result normal?
1. YES: Go to Step 4.
2. NO: Troubleshoot the keyless entry system. Refer to TROUBLE SYMPTOM CHART < KOS > or TROUBLE SYMPTOM CHART < WCM >.
STEP 4. Check the tail lights and headlights.
When the lighting switch is operated, check that the tail lights and headlights illuminate/go off normally.

Q: Is the check result normal?
1. YES: Go to Step 5.
2. NO: Troubleshoot the tail lights and headlights. Refer to TROUBLE SYMPTOM CHART .
STEP 5. Retest the system.
Check that the welcome light function works normally.

Q: Is the check result normal?
1. YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO: Replace the ETACS-ECU.