What Causes the Bulb Failure Warning Light to Illuminate?

1 Answers
LeSamantha
07/30/25 7:01am
When the bulb failure warning light comes on, it indicates that one of the vehicle's bulbs has burned out, reminding the owner to immediately inspect all the vehicle's lights. In most cases, replacing the faulty bulb will turn off the warning light. If all lights are checked and found to be functioning properly, but the warning light remains illuminated, there are several possible reasons: 1. There may be a loose connection in the wiring, causing excessive resistance in the lighting circuit, which the vehicle's computer mistakenly interprets as a bulb malfunction. 2. Poor contact in the wiring. 3. The bulb filament may be partially broken. Solutions: 1. Park the vehicle in a safe location, turn off the engine, and use a wrench to disconnect the negative terminal of the battery. Wait for 15 seconds before reconnecting it, then observe if the warning light turns off. 2. If the light goes off, the issue is resolved. If the light remains on, visit a 4S shop or a professional auto repair shop to use a code reader to diagnose the exact location of the fault.
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