1995 Cadillac El Dorado electrical gremlins. Uuuugh!

Tiny
SL600
  • MEMBER
  • 1995 CADILLAC EL DORADO
  • 95,000 MILES
Blinkers will not work with headlight on.

if I turn the headlights on and adjust the dash light brighter then they start to flicker and the buzzer/chime makes a noise (not a normal noise) that's distorted.

The twilight system no longer functions. If I turn it on at night from the slider switch the light just dimly flicker and once again the chime/buzzer seems to be making distorted sounds.

The only way that the system seems to function properly is if I have one of the doors open and the interior lights are turned on by fully turning the dimmer switch fully clockwise.

The only codes displayed that would have anything to do with the problem would be I022 "panel dimming switch pot circuit"

I have replaced the headlight switch assembly, checked the grounds on the radiator support, left/right kick panels, checked all the fuses, headlight relay and nothing seems to be a miss.

I've never used a service like this so I'm kind of leery about paying for something that I'm not sure I'll receive. I will pay the minimum and if you help me rectify the problem I'll be more then happy to compensate fairly.

Thanks in advance for your help,

Marc
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Monday, October 21st, 2013 AT 6:55 AM

6 Replies

Tiny
HMAC300
  • EXPERT
Check the things I've pointed out in the pic. It may be your turn signal module is bad the relay just switch with a like relay to see if it does the same and you might try a new flasher. Also clean the grounds in trunk l&R wheel wells. However a pro may need to look at this to fix it.
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Monday, October 21st, 2013 AT 9:43 AM
Tiny
HMAC300
  • EXPERT
For got diagram sorry
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Monday, October 21st, 2013 AT 9:44 AM
Tiny
SL600
  • MEMBER
Hi hmac300,

thanks so much for a speedy reply, much appreciated. I'll be sure to check out the key points that you suggested and give you an update once they have been performed.
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Monday, October 21st, 2013 AT 10:34 AM
Tiny
SL600
  • MEMBER
Well after many hours I narrowed it down to a single area/circuit. If I remove the left side (drivers) park lamp fuse in the trunk I lose all of my left side parking lamps (of course) but everything else functions as it should (break lights, blinkers, headlights.) I have checked all the grounds that are associated with this circuit and made sure they are clean and secure. After looking at the a full wire diagram I have I'm thinking maybe it could be the "parking lamp/exterior light" body control module that's located behind the seat in the trunk maybe? It' looks like the only other link in the chain so to speak.
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Friday, October 25th, 2013 AT 3:54 AM
Tiny
SL600
  • MEMBER
Ok! After studying the wire schematics I have I now see that there is not a dedicated BCM for the parking/exterior lights, it's one unit that controls a multitude of things, so this would rule out a bad BCM. At this point I'm guessing it's rather simple and just a bad connection/damaged wire somewhere. I've removed the rear taillights, checked the bulbs, wires, bulb sockets and all looks well.
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Friday, October 25th, 2013 AT 5:27 AM
Tiny
HMAC300
  • EXPERT
Best thing to do her eis to get a circuit breaker to put in place of fuse then start unplugging things to see where the short is. If this has ever been in an accident on that side then check the area where it was hit or damaged. It may be a wire pinched there. Circuit breakers are available at auto parts and you only need a small one like 15 amp or 20 amp it will put power off and on until you find the shorted area.
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Friday, October 25th, 2013 AT 7:02 AM

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