Identifying Exterior Lighting System Problems
NOTE:
Perform SYMPTOM ID TEST 1A before proceeding with this test. For connector terminal identification and wiring diagrams, see
BODY CONTROL COMPUTER - INTRODUCTION. Perform VERIFICATION TEST: VER-2A after each repair.
CAUTION:
Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
Using scan tool, select READ DTCs. If scan tool displays HEADLAMP SWITCH INPUT FAILURE, go to EXTERIOR LIGHT TEST 2A . If scan tool does not display HEADLAMP SWITCH INPUT FAILURE, go to EXTERIOR LIGHT SYSTEM DIAGNOSTIC TEST DIRECTORY .
EXTERIOR LIGHT SYSTEM DIAGNOSTIC TEST DIRECTORY
| Problem | Perform |
|---|---|
| Low Beam Headlights Will Not Turn On | EXTERIOR LIGHT TEST 3A |
| Low Beam Headlights Will Not Turn Off | EXTERIOR LIGHT TEST 4A |
| Parking Lights Will Not Turn On | EXTERIOR LIGHT TEST 5A |
| Parking Lights Will Not Turn Off | EXTERIOR LIGHT TEST 6A |
| High Beam Headlights Will Not Turn On | EXTERIOR LIGHT TEST 7A |
| High Beam Headlights Will Not Turn Off | EXTERIOR LIGHT TEST 8A |
| Fog Lights Will Not Turn On | EXTERIOR LIGHT TEST 9A |
| Fog Lights Will Not Turn Off | EXTERIOR LIGHT TEST 10A |
| Headlight Time Delay | EXTERIOR LIGHT TEST 11A |
| Auto Headlights And/Or Fog Lights Not Operating Properly | EXTERIOR LIGHT TEST 12A |