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Electrical Discuss anything related to OEM & aftermarket electrical devices including: stereos, speakers, video, batteries, starters, the body control module, lighting, etc.

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Old 09-28-2010, 03:42 AM   #1 (permalink)
Chris_S
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Dimming Dash Lights

If I am driving the truck down the road after about 30 minutes the dash lights (Cluster, radio, A/C & heater Controls) will dim, then will brighten back up. Bumps don't seem to effect it, and it will only do it if I am driving around for at least 30 minutes. The bright to dim and back will last anywhere from 30 seconds to 5-10 minutes. I have moved the dash light dimmer switch around, and it is not a smooth low to high illumination, so I am thinking this might be what is going south. Anything else I should be looking for?
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Old 09-30-2010, 02:40 PM   #2 (permalink)
Chris_S
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I replaced the headlight switch, that did not solve the problem. Anyone have any ideas what may be causing the dimming gremlin?
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07 Chev Classic Crew Cab D/A LBZ Long Bed 4x4
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Autometer UltraLite II Boost/Pyro with Pillar Mount
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2008 Jayco Eagle 299RLS 5th Wheel - Sold
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Last edited by Chris_S; 09-30-2010 at 02:40 PM.
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Old 11-29-2012, 06:20 PM   #3 (permalink)
Lingus
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I'm gonna drag this one out of obscurity...

I have the same exact problem. Any ideas?
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Old 11-29-2012, 07:01 PM   #4 (permalink)
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I believe the light sensor in the middle of the top of the dash near the windshield is responsible for dimming/brightening the dash lighting to compensate for night (dims the lighting) and day (brightens the lighting) driving.

Perhaps your sensor is partially or completely obstructed or is going bad.

It doesn't kick back and forth immediately because it's trying to be smart enough to handle passing through a shady area during the day, and passing under street lamps at night. In other words, it only switches once it senses a difference in ambient lighting over a small sustained period of time.

-Garrett
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Old 11-30-2012, 10:52 AM   #5 (permalink)
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Lingus,

I agree with “garrett41”, it may be related to the light sensor. Is it clouded or covered by chance?

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Old 12-03-2012, 12:58 AM   #6 (permalink)
bruce625
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my truck has/had this issue been ok for a few months but when it was acting up i played with the dimmer switch when turned all the way up the problem went away I was thinking it wad abad dimmer switch
just a thought
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Old 12-03-2012, 08:16 AM   #7 (permalink)
Diesel52
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Dash Lights

I thought that the light sensor in the middle of the dash was for the day time running lights, the inside clear ones? It has fallen down on mine and is usless! What a stupid design! I would figure the the rehostat ( girlfriend is busy at work this time of the morning for my spelling) is going south? And or need cleaning?
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Old 12-22-2012, 12:01 AM   #8 (permalink)
Lingus
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Quote:
Originally Posted by GM Customer Svc View Post
Lingus,

I agree with “garrett41”, it may be related to the light sensor. Is it clouded or covered by chance?

Louis
GM Customer Service
Thanks for responding.

I didn't even think of the light sensor. Is it really part of that dash light circuit? I will check anyways.
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Old 12-24-2012, 12:04 PM   #9 (permalink)
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Keep us posted Lingus! Let us know if you have any questions.

Tricia, GM Customer Service (Assisting Louis).
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Old 04-02-2013, 03:27 AM   #10 (permalink)
pbar34
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Same Problem

Did you guys find the fix for the dim then bright, then dim dash lights? I can have my dimmer switch all the way down (low) and then the dash lights will come on almost full bright for a bit then go dim then repeat. Dimmer switch will work fine at times then not. I don't understand why the light sensor on top of the dash would override the dimmer switch. I suspect a faulty dimmer switch (?). Thanks.


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