Inspection Procedure 5: One of the headlight(s) does not illuminate: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB992006: Extra fine probe
MB991223: Harness set

STEP 1. Bulb check
Check the bulb(s) of headlight that does not illuminate.

NOTE: If discharge-type low-beam headlights do not illuminate, their bulbs cannot be inspected. In this case, assume the bulbs to be normal and proceed with steps.

Q: Is the check result normal?
- YES: Go to Step 2.
- NO: Replace the bulb(s) of the light that does not illuminate.
STEP 2. Resistance measurement at the headlight assembly (LH) or (RH) connector (ground terminals).
1. Disconnect the connector, and measure at the wiring harness side.
2. Measure the resistance between the connector of light which does not illuminate and ground.
  - Measure the resistance between the headlight assembly (LH) or (RH) connector (ground terminals) and ground.
    OK: The resistance should be 2 ohms or less
Q: Is the check result normal?
- YES: Go to Step 4.
- NO: Go to Step 3.
STEP 3. Check of open circuit in ground lines between the headlight assembly (LH) or (RH) connector and ground.
Q: Is the check result normal?
- YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
- NO: Repair the connector(s) or wiring harness.
STEP 4. Check of open circuit in power supply lines between the headlight assembly (LH) or (RH) connector and headlight relay (LO) or (HI) connector.
Q: Is the check result normal?
- YES: Replace the headlight assembly that does not illuminate.
- NO: Repair the connector(s) or wiring harness.