FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Mitsubishi >> 2004 >> Lancer Evolution L4-2.0L DOHC Turbo >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> J - Charts >> Inspection Procedure J-7

Inspection Procedure J-7

Headlight and Taillight: One of the headlights does not illuminate.

Headlights Circuit Part 1:




Headlights Circuit Part 2:




TECHNICAL DESCRIPTION (COMMENT)
If one of the headlights does not illuminate, a headlight bulb may be defective.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The headlight bulb may be defective
- The high-beam indicator light bulb may be defective

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set

STEP 1. Check the headlight operation.

Q: Which of the headlights does not illuminate?

Low-beam (LH and/or RH): Refer to Headlight, Side Marker Light and Position Light Assembly - Lighting System Diagnosis.

High beam (LH): Go to Step 2.

High beam (RH): Go to Step 7

High-beam indicator light: Go to Step 12.

High beam (both RH and LH) and high-beam indicator light: Refer to Inspection Procedure J-3 "Headlights (high-beam) do not illuminate."

STEP 2. Check headlight (LH) connector A-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector.




Q: Are headlight (LH) connector A-15 in good condition?

YES: Go to Step 3.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the headlights illuminate normally.

STEP 3. Check headlight bulb (LH).
1. Remove the headlight bulb (LH).
2. Verify that the headlight bulb (LH) is not damaged or burned out.

Q: Is headlight bulb (LH) normal?

YES: Go to Step 4.

NO: Replace the headlight bulb (LH). Verify that the headlights illuminate normally.

STEP 4. Check the ground circuit to the headlight (LH). Measure the resistance at headlight (LH) connector A-15.




1. Disconnect headlight (LH) connector A-15 and measure the resistance available at the wiring harness side of the connector.




2. Measure the resistance value between terminal 2 and ground.
- The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 6.

NO: Go to Step 5.

STEP 5. Check the wiring harness between headlight (LH) connector A-15 (terminal 2) and ground.




Q: Is the wiring harness between headlight (LH) connector A-15 (terminal 2) and ground in good condition?

YES: Replace the headlight bulb (LH). Verify that the headlight (LH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the headlights illuminate normally.

STEP 6. Check the wiring harness between headlight (LH) connector A-15 (terminal 1) and front-ECU connector A-10X (terminal 2).







Q: Is the wiring harness between headlight (LH) connector A-15 (terminal 1) and front-ECU connector A-10X (terminal 2) in good condition?

YES: Replace the headlight bulb (LH). Verify that the headlight (LH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the headlights illuminate normally.

STEP 7. Check headlight (RH) connector A-21 for loose, corroded or damaged terminals, or terminals pushed back in the connector.




Q: Are headlight (RH) connector A-21 in good condition?

YES: Go to Step 8.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the headlights illuminate normally.

STEP 8. Check headlight bulb (RH).
1. Remove the headlight bulb (RH).
2. Verify that the headlight bulb (RH) is not damaged or burned out.

Q: Is headlight bulb (RH) normal?

YES: Go to Step 9.

NO: Replace the headlight bulb (RH). Verify that the headlights illuminate normally.

STEP 9. Check the ground circuit to the headlight (RH). Measure the resistance at headlight (RH) connector A-21.




1. Disconnect headlight (RH) connector A-21 and measure the resistance available at the wiring harness side of the connector.




2. Measure the resistance value between terminal 2 and ground.
- The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 11.

NO: Go to Step 10.

STEP 10. Check the wiring harness between headlight (RH) connector A-21 (terminal 2) and ground.




Q: Is the wiring harness between headlight (RH) connector A-21 (terminal 2) and ground in good condition?

YES: Replace the headlight bulb (RH). Verify that the headlight (RH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the headlights illuminate normally.

STEP 11. Check the wiring harness between headlight (RH) connector A-21 (terminal 3) and front-ECU connector A-10X (terminal 2).







Q: Is the wiring harness between headlight (RH) connector A-21 (terminal 3) and front-ECU connector A-10X (terminal 2) in good condition?

YES: Replace the headlight bulb (RH). Verify that the headlight (RH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the headlights illuminate normally.

STEP 12. Check combination meter connector C-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.




Q: Is combination meter connector C-01 in good condition?

YES: Go to Step 13.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the high-beam indicator light illuminates normally.

STEP 13. Check high-beam indicator light bulb.
1. Remove the high-beam indicator light bulb.
2. Verify that the high-beam indicator light bulb is not damaged or burned out.

Q: Is the high-beam indicator light normal?

YES: Go to Step 14.

NO: Replace the bulb. Verify that the high-beam indicator light illuminates normally.

STEP 14. Check the combination meter (printed-circuit board).
1. Remove the combination meter. Refer to Combination Meter Assembly and Vehicle Speed Sensor.
2. Remove the high-beam indicator light bulb. Then measure the resistance value between the bulb terminals.




3. Install the bulb to the combination meter, and then measure the resistance value between connector C-01 terminals 4 and 5. The measured resistance value should be roughly the same as the value measured in Step (2).

Q: Are these two resistance values extremely different?

YES: Repair or replace the combination meter (printed circuit board). Verify that the headlight-beam indicator light illuminates normally.

NO (roughly the same): Go to Step 15.

STEP 15. Check the battery power supply circuit to the combination meter. Measure the resistance at combination meter connector C-01.




1. Disconnect combination meter connector C-01 and measure the resistance available at the wiring harness side of the connector.




2. Measure the resistance value between terminal 4 and ground.
- The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 17.

NO: Go to Step 16.

STEP 16. Check the wiring harness between combination meter connector C-01 (terminal 5) and ground.




Q: Is the wiring harness between combination meter connector C-01 (terminal 5) and the battery in good condition?

YES: Replace the combination meter. Verify that the high-beam indicator light illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the high-beam indicator light illuminates normally.

STEP 17. Check the wiring harness between combination meter connector C-01 (terminal 4) and front-ECU connector A-10X (terminal 2).









NOTE: Also check intermediate connector C-129 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-129 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between combination meter connector C-01 (terminal 4) and front-ECU connector A-10X (terminal 2) in good condition?

YES: Replace the combination meter. Verify that the high-beam indicator light illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the high-beam indicator light illuminates normally.
pro multis Credits:Operation CHARM About Operation CHARM