Dome light will not come on

CSA1

MEMBER
2001 FORD F-150
5.4L
V8
2WD
AUTOMATIC
235,000 MILES

My truck is the Lariat. It is having a odd electrical problem. Up until a couple weeks ago, everything worked fine, but last week, the dome light will not come on and windows will not roll down. Checked all the fuses and they are all good. Any idea's what I should check next? Had a friend tell me it is possibly the G.E.M. Gone bad?

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HMAC300

MECHANIC
48,601 POSTS

Both are hooked up to the GEM module and also the battery saver relay. The lights also run through the interior light relay.

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Wednesday, February 8th, 2017 AT 12:18 PM

CSA1

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78 POSTS

Should I start with GEM or battery saver relay?

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Saturday, February 11th, 2017 AT 11:37 AM

CSA1

MEMBER
78 POSTS

Checked the grounds, all good & ohmed out like they should, It's like a relay or fused is popped somewhere, but all the fuses are good & I replaced the battery save relay, If the windows have their own relay, I'll be damned if I can find it :/

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Saturday, February 11th, 2017 AT 11:51 AM

CSA1

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78 POSTS

Question, after changing the GEM ( Numbers matched ) does it need to be reprogrammed?

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Saturday, February 11th, 2017 AT 12:27 PM

KEN L

MASTER CERTIFIED MECHANIC
48,397 POSTS

Hey,

I have heard of people plugging them in and they work, but then others times they don't and they will need to be reprogrammed.

Please let us know happens so it will help others.

Best, Ken

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Wednesday, February 15th, 2017 AT 9:52 AM