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I have a 1995 Impala SS and my digital speedometer has been going on and off while Im driving for the past couple months, I dont know whats causing. But in the last week it has completely not worked at all to where it usually goes on and off within a day or two max. Also along with that my gauge lights went out, the ones that I can see my fuel, oil pressure and battery information. They all work just no lights so I cant see them in the dark. Any ideas on how to fix these? I cant afford a whole new cause they look pretty pricey so any help would be much appreciated. Thanks.
 

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Welcome to the 'No Dash Lights' club. Mine went out about a month ago.
I've been trying to get mine working again too, It's driving me nuts.

Mine is a '95 too, with digi speedo.... Speedo works untill I turn on the headlights, then goes black...No dashlights what so ever... Well except the headlight switch lights up.

Does your headlight switch light up?
Have you done ANY electrical work recently? (stereo install) ?

Here is my thread:
http://www.impalassforum.com/vBulletin/showthread.php?t=338081

others threads:
http://www.impalassforum.com/vBulletin/showthread.php?t=274719
http://www.impalassforum.com/vBulletin/showthread.php?t=253935
http://www.impalassforum.com/vBulletin/showthread.php?p=2323433
http://www.impalassforum.com/vBulletin/showthread.php?p=3206306

B Body electrical gurus help us. :D
 

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Welcome to the 'No Dash Lights' club. Mine went out about a month ago.
I've been trying to get mine working again too, It's driving me nuts.

Mine is a '95 too, with digi speedo.... Speedo works untill I turn on the headlights, then goes black...No dashlights what so ever... Well except the headlight switch lights up.

Does your headlight switch light up?
Have you done ANY electrical work recently? (stereo install) ?

Here is my thread:
http://www.impalassforum.com/vBulletin/showthread.php?t=338081

others threads:
http://www.impalassforum.com/vBulletin/showthread.php?t=274719
http://www.impalassforum.com/vBulletin/showthread.php?t=253935
http://www.impalassforum.com/vBulletin/showthread.php?p=2323433
http://www.impalassforum.com/vBulletin/showthread.php?p=3206306

B Body electrical gurus help us. :D
Well today my speedometer lit up for the first time in a while, i tryed to use my dimmer knob but it didnt work at all but it does work to turn on my ceiling light so i dont think that its broke cause my headlight switch and everything else works. I think my fuse went out but idk where its at, do you know? And no my headlight switch doesnt light up nor does anything else includujg my heater lights and all my dash guages except for a pass key light or something like that i think but i could be wrong.
 

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My dash lights have been out ever since I bought my car, it's not a daily driver so it's been low on the priority list. Could just be all the bulbs are blown but I doubt that. Speedo works fine. 94 SS.
 

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Well today my speedometer lit up for the first time in a while, i tryed to use my dimmer knob but it didnt work at all but it does work to turn on my ceiling light so i dont think that its broke cause my headlight switch and everything else works. I think my fuse went out but idk where its at, do you know? And no my headlight switch doesnt light up nor does anything else includujg my heater lights and all my dash guages except for a pass key light or something like that i think but i could be wrong.
The fuse block is located on the driver side of the dashboard.
Open the driver door and look at the side of the dashboard, take the cover off. The fuse that operates the instrument panel cluster dimmer is #42.
 

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The fuse block is located on the driver side of the dashboard.
Open the driver door and look at the side of the dashboard, take the cover off. The fuse that operates the instrument panel cluster dimmer is #42.
The fuse was blown, I replaced it and it still isnt working. Any more ideas?
 

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The fuse was blown, I replaced it and it still isnt working. Any more ideas?
the dimmer is a switch and a variable resistor. the resistor gets damaged when someone uses this circuit to operate a device. this can occur when connecting a radio up and not using the proper connections.

the dash lights use very small lamps , draw little power . the wire color to these are specific. so check to see what color the wire is and follow this wire to find a short circuit or that this circuit feeds some non oem device.

I would not hook up a new headlight switch/dimmer assy until this circuit is checked out.
 

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Hello and Happy Tuesday to all, hope this post finds you well. I am cleaning up my 1995 Impala SS (112k miles) to sell it (wife says its time to go now that the twins are here....sigh). My digital dash speedo works fine UNTIL I put the headlights on, then the speedo goes out completely. I assume it is the headlight switch or the rocker switches next to it ? Nothing but problems with these digital speedos !! Any suggestions on what to replace, part numbers, how to get these switches out, etc. ?? Thanks in advance for any assistance, Chris [email protected]
 

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I assume it is the headlight switch or the rocker switches next to it ? Nothing but problems with these digital speedos !! Any suggestions on what to replace, part numbers, how to get these switches out, etc. ??
These switches have no direct connection to the dash light dimming circuit. I do not have the time to point to other threads where someone has waisted time and money by replacing the headlight switch with no diagnostic reason to do so. Actual dimming is done by a module .
DimMod.jpg

Your problem is most likely a bad ground. There are several going to the speedometer cluster.
 

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These switches have no direct connection to the dash light dimming circuit. I do not have the time to point to other threads where someone has waisted time and money by replacing the headlight switch with no diagnostic reason to do so. Actual dimming is done by a module .
View attachment 192487
Your problem is most likely a bad ground. There are several going to the speedometer cluster.
I think it is the illumination dimmer thing.....the wheel switch that controls the brightness of the dashboard lights and turns the interior light on. If I jiggle/play with it a little, right before it turns the interior dome light on, it works (albeit intermittently) . Any ideas on the name of that switch or part # ? Thanks !! Happy Thursday !!
 

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I think it is the illumination dimmer thing..
For those that want to diagnose the problem: the dimmer control output is the dark green wire and the output from the module is a gray wire, When the dimmer knob is moved the voltage at these two points should track the knobs movements without gaps or sudden changes. The spot to check them could be at the module in the picture I posted.

The dimming circuit controls lights on the radio,heater controls, and the gauges. If one of them works properly then the headlight switch or dimmer module is not the problem.
 
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