Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test 47A - Identifying Headlight System Problems (With Auto Headlight System)
Diagnosis of AUTO headlight system is separated into 7 categories. Identify problem area(s) listed in TEST 47A DIAGNOSTIC DIRECTORY table and perform the indicated test(s).
| Complaint | Perform |
|---|---|
| Headlights Will Not Turn Off | TEST 45A |
| Headlight Time Delay Will Not Turn On | TEST 46A |
| Headlights & Parking Lamps Inoperative In AUTO Mode | TEST 48A |
| Headlights Inoperative In AUTO Mode | TEST 49A |
| Parking Lamps Inoperative in AUTO Mode | TEST 50A |
| Headlights & Parking Lamps Will Not Turn Off | TEST 51A |
| Parking Lamps Will Not Turn Off | TEST 52A |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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