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Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007 Forum for discussion of the Ford Taurus, Mercury Sable and Ford Taurus SHO. Covers vehicle years: 1986-2007

 
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post #1 of 3 (permalink) Old 10-27-07, 10:53 AM Thread Starter
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2000 Merc Sable Auto Lights

In automatic on/off mode, my lights automatically turn on (regardless of light conditions) at ignition, but the problem is they no longer turn off in daylight conditions ... that is, they stay on all the time. The auto function itself seems to continue to work, in that the lights do turn off automatically and normally after you turn the engine off.

Trying to figure which part(s) to replace, I don't know if the problem is in the daylight sensor itself (wherever it is -- I don't know), or in a relay somewhere along the line, or the switch itself. Thanks for any help.

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post #2 of 3 (permalink) Old 10-27-07, 01:18 PM
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Re: 2000 Merc Sable Auto Lights

I had the same problem with my GMC truck. Turned out to be a build-up of armour all and dust on the sensor. Mine is on the dash but have seen them on the rearview mirror as well.
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post #3 of 3 (permalink) Old 10-27-07, 02:21 PM
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cool Re: 2000 Merc Sable Auto Lights

Quote:
Originally Posted by TeddyMac
In automatic on/off mode, my lights automatically turn on (regardless of light conditions) at ignition, but the problem is they no longer turn off in daylight conditions ... that is, they stay on all the time. The auto function itself seems to continue to work, in that the lights do turn off automatically and normally after you turn the engine off.

Trying to figure which part(s) to replace, I don't know if the problem is in the daylight sensor itself (wherever it is -- I don't know), or in a relay somewhere along the line, or the switch itself. Thanks for any help.
Probably a bad sunload sensor on top of the dash. When the one on my 2001 Taurus SEL went the sensitivity went way up- the lights would come on when there was only minimal clouds in the sky, and my EATC was throwing a code for it when I ran the EATC's diagnostic mode. Don't remember the exact price but it was relatively inexpensive at the Ford dealer.

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