Inspection Procedure 2: None of the high-beam headlights 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. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III). Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III) ."
2. Turn the ignition switch to the "ON" position.
3. Check whether the ETACS-ECU related DTC is stored.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC stored?
- YES: Troubleshoot the ETACS-ECU. Refer to DIAGNOSTIC TROUBLE CODE CHART .
- NO: Go to Step 2.

STEP 2. Using scan tool (M.U.T.-III), check data list

Use the ETACS-ECU service data to check the signal related to the operation of headlight function.

Headlight switch to ON.

Item No.	Item name	Normal condition
Item 341	Head light switch	ON

OK: Normal condition is displayed.

Q: Is the check result normal?

YES: Go to Step 3.
NO: Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 11: THE COLUMN SWITCH SIGNAL IS NOT RECEIVED .

STEP 3. Headlight relay (HI) check
Refer to HEADLIGHT RELAY CHECK .

Q: Is the check result normal?
- YES: Go to Step 4.
- NO: Replace the headlight relay (HI).
STEP 4. Voltage measurement at the headlight relay (HI) connector
1. Remove the headlight relay (HI), and measure at the relay box side.
2. Measure the voltage between headlight relay (HI) connector (power supply terminal) and ground.
  OK: The voltage should measure approximately 12 volts (battery positive voltage).
Q: Is the check result normal?
- YES: Go to Step 5.
- NO: Go to Step 6.
STEP 5. Check of open circuit in HHI line between ETACS-ECU connector and headlight relay (HI) connector
Q: Is the check result normal?
- YES: Go to Step 7.
- NO: Repair the connector(s) or wiring harness.
STEP 6. Check of open circuit in power supply line between fusible link and headlight relay (HI) connector
Q: Is the check result normal?
- YES: Go to Step 7.
- NO: Repair the connector(s) or wiring harness.
STEP 7. Retest the system
Check that the headlights (high-beam) illuminate normally.

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