Inspection Procedure 1: None of taillights illuminates: Diagnosis
- STEP 1. License plate light operation check
Check that the license plate light illuminates normally.
Q: Does license plate light work normally?
YES: Go to Step 2.
NO: Replace the ETACS-ECU.
- 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.
- Connect scan tool MB991958. Refer to DIAGNOSIS .
- Turn the ignition switch to the "ON" position.
- Check whether the ETACS-ECU related DTC is set.
- Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES: Diagnose the ETACS-ECU. Refer to ETACS, DIAGNOSIS .
NO: Go to Step 3.
- STEP 3. Using scan tool MB991958, check data list.
Use the ETACS-ECU data list to check the signals related to the taillight illumination.
- Turn the taillight switch to the "ON" position.
Item No. Item name Normal conditions Item 218 Taillight ON Q: Does scan tool MB991958 display the items "Taillight" as normal condition?
YES: Go to Step 4.
NO: Troubleshoot the ETACS-ECU (Refer to TROUBLE SYMPTOM CHART FOR INPUT SIGNAL ).
- STEP 4. Retest the system
Check that the taillight illuminates normally.
Q: Does the taillight work normally?
YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
NO: Replace the ETACS-ECU.