Question about 2002 Cadillac DeVille DTS
Bulb okay, ground okay
Each headlight lens assembly has two bulbs - did you check both? These bulbs are used independently in different ways depending on the commanded tasks [e.g. unlocking car, car running during daytime with running lights (if equipped), headlights on (auto or manual - low or high beam)].
If both bulbs check out, I would replace them one at a time anyway just to be sure. It is not uncommon for a bulb to show a good resistance reading with a multimeter and then go open under full load. Also verify the bulbs and the wiring harness connector are seating properly.
Posted on Dec 07, 2014
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Posted on Jan 02, 2017
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