Auto headlight function doesn't work. Lights on all the time in Auto...

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Mar 2, 2012 | 10:14 AM

John7894

Thread Starter

Cargo Master

Joined: Jan 2002

Posts: 2,079

Likes: 11

From: LA and CO

Auto headlight function doesn't work. Lights on all the time in Auto...

My headlights and foglights are on all the time while the switch is in the AUTO position. Any ideas? They do go off when I switch it off. Would like the AUTO function to work properly.

Any ideas?

Mar 2, 2012 | 10:46 AM

fbnmark

Junior User

Joined: Oct 2010

Posts: 68

Likes: 0

bad sensor on the dash

Mar 2, 2012 | 10:51 AM

BroncoEx

Senior User

Joined: Mar 2007

Posts: 146

Likes: 0

Something covering the sensor up? I do that all the time....... throw a paper onto the dash and my lights come on!!

Mar 2, 2012 | 10:56 AM

John7894

Thread Starter

Cargo Master

Joined: Jan 2002

Posts: 2,079

Likes: 11

From: LA and CO

Nothing covering the sensor. All wires appear to be OK

Mar 2, 2012 | 11:47 AM

smokewagun

Cargo Master

Joined: Feb 2004

Posts: 2,101

Likes: 60

From: N. Illinois

Does your truck possibly have DRL's - daytime running lamps?

Mar 2, 2012 | 11:57 AM

ccerniglia

Elder User

Joined: Aug 2006

Posts: 557

Likes: 1

From: Bristol, CT

Quote:

Originally Posted by smokewagun

Does your truck possibly have DRL's - daytime running lamps?

There is something wrong with the switch or photo sensor.

Mar 2, 2012 | 12:01 PM

John7894

Thread Starter

Cargo Master

Joined: Jan 2002

Posts: 2,079

Likes: 11

From: LA and CO

No DRL that I know of. All are on though. Run, fog and head.

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Mar 2, 2012 | 12:07 PM

dchamberlain

Lead Driver

Joined: Sep 2007

Posts: 8,180

Likes: 669

From: Scio, OR

There is a sensor on the dash. Dome looking thing at the edge of one of the defrost vents. I'd say this is most likely the problem. I don't think it's expensive. You might try just unplugging it and see if the lights go out.

But, it might also be a problem with wiring rubbed through, a short or break in the wires, or a problem in the module the control the autolamps. I'm not sure which one that is in either a 2001 or 2002, it could be the GEM or the Vehicle Security Module. Sometime in about that time period, the GEM went away. I don't have wiring diagrams for those years either.