Headlights on in bright sunlight

Asked by Aug 06, 2015 at 05:40 PM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

With automatic headlight control on, headlights always on. Off position turns them off.

4 Answers

50

Replace the sensor

1 out of 1 people think this is helpful.
100,035

Yep sounds like the sensor is no good....

1 out of 1 people think this is helpful.

Unless you have a dash cover-protector covering the 'eye' sensor. Then it 'thinks' it's always dark

1 out of 1 people think this is helpful.
64,995

Unplug the sensor and connect the two wires in the plug together, for testing purposes, with a short jumper wire. If the headlights now stay off in the "auto" setting, the sensor is bad. Low resistance across the sensor is light, so the headlights will be off, high resistance across the sensor is darkness, so the headlights will be on. HTH. -Jim

1 out of 1 people think this is helpful.

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