Instrument cluster does not light up. (94 Bonneville) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-15-2004, 02:31 PM   #1
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Default Instrument cluster does not light up. (94 Bonneville)

I just bought a used 94 Bonneville. I brought it home last night and discovered the instrument cluster does not light up. Headlights come on, and other interior lights work. The indicators on the left side (airbag, service engine, parking break, etc) illuminate correctly but the gas gauge, tachometer, and spedometer do not.

I check the fuse (9C, 10 Amp) and it seems to be alright. The manual does not specify a replacement bulb for the cluster, nor have I been able to discover where I am to insert one. Any help would be greatly appriciated. Thanks!
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Old 07-15-2004, 04:11 PM   #2
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Check all your fuses. I lost my dash lights when I installed my stereo (Tape off any unised wires, btw) and an odd fuse blew, taking the dash lights with it. It wasn't the dash light fuse...
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Old 07-15-2004, 06:33 PM   #3
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Try wiggling the rheostat around on the headlamp switch.
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Old 07-15-2004, 06:49 PM   #4
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Quote:
Originally Posted by MOS95B
Check all your fuses. I lost my dash lights when I installed my stereo (Tape off any unised wires, btw) and an odd fuse blew, taking the dash lights with it. It wasn't the dash light fuse...
Hmm, that might be it. The previous owner yanked out all his aftermarket stero equipment before sale and left quite a few dangling wires behind. (That'* another issue, while putting the stock unit back in no sound comes from any speaker. I even tried with a kenwood I know works.) Is there any documentation available on the Bonneville audio system? I have a feeling I have lots of reconnections to make... :(
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Old 07-15-2004, 08:35 PM   #5
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Quote:
Originally Posted by fuddyduddy121
Try wiggling the rheostat around on the headlamp switch.
Same problem I have now, dash lights work ok just got to wiggle alittle.
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Old 07-16-2004, 09:29 AM   #6
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Power to the instrument cluster backlights goes through a rheostat in the headlight switch. Yours might be toast. I just replaced my headlight switch for $40 and my instrument cluster lights no longer flicker. The old rheostat was pretty corroded.

Here'* the procedure if you want to pull out the switch and look at it. It took me about 20 minutes to get mine out. You'll need a Torx 15 bit. The procedure doesn't mention this, but I had to put my gearshift into drive in order to pull the trim panel off.
http://www.bonnevilleclub.com/techinfo/?article=56
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Old 07-16-2004, 09:31 AM   #7
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it is the headlight switch i had the same problem
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Old 07-16-2004, 10:03 AM   #8
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Ditto on the headlamp switch
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Old 07-16-2004, 01:24 PM   #9
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do you have parking lamps? check fuse #14
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Old 07-16-2004, 02:23 PM   #10
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Quote:
Originally Posted by bambam
do you have parking lamps? check fuse #14
Which is #14? I just found out A9 and B9 are out, going to replace those at lunch and see if that helps.
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