1999 Cadillac Deville 1999 Cadillac Deville electrical prob

Tiny
MIKE31416
  • MEMBER
  • 1999 CADILLAC DEVILLE
Electrical problem
1999 Cadillac Deville V8 Automatic

The battery, starter and alternator are Ok. But, occassionally, typically in very cold weather, the car will not start. What happens is that when the key is turned to the "ON" position, the display does not light up and then nothing happens when the key is moved to the "START" position. The problem always goes away by itself, and is therefore difficult to diagnose.
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Thursday, January 28th, 2010 AT 11:23 AM

5 Replies

Tiny
FACTORYJACK
  • EXPERT
By nothing, there is no chime, dome lights, or any indication of battery power at all?
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Thursday, January 28th, 2010 AT 6:27 PM
Tiny
MIKE31416
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I called the customer and he said that when the problem has occured, the door lights and the map lights still worked, and the headlights and the backlighting of the various knobs that comes on with the headlights worked, but the radio did not work and the radio antenna did not come up as it does when the radio is turned on.
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Thursday, January 28th, 2010 AT 7:16 PM
Tiny
FACTORYJACK
  • EXPERT
Have you observed the vehicle with this condition, or can the condition be duplicated? There are some checks that can be made, if it can be duplicated it would be best. Initially, in reviewing the schematic, I think that it is loss of power to the IPC that may be causing it. The resulting no start/crank is because it is a key player in the theft system. The cluster fuse in the rear compartment fuse block receives power from the body 3 fuse in the underhood fuse block, via a combination of power relays, controlled power in rear compartment relay center 1, and a controlled power backup relay in rear compartment relay center 2. Both of these relays are controlled by the PZM or body control module. If you can get it to fail, Check for power on the cluster fuse, as well as the radio/phone fuse. If you want to try something and the customer is O.K. Doing the R&D, swap the controlled power and controlled power backup relays both, with similar 'known good' relays, and see if the fault reoccurs.
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Thursday, January 28th, 2010 AT 10:50 PM
Tiny
MIKE31416
  • MEMBER
I have never observed the condition, and to date we don't know how to duplicate the condition. Your diagnosis makes good sense to me. Can you tell me more specifically where to find some of the fuses and relays you mentioned.
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Thursday, January 28th, 2010 AT 11:42 PM
Tiny
FACTORYJACK
  • EXPERT
The rear fuse panel is accessed in the trunk, behind the parcel shelf/rear seat liner. There should be a legend beside it. The relay centers, there are four of them, are behind the rear seat back on the passenger compartment side. They are 1-2-3-4 from left to right, when looking toward the rear, #1 being closest to the center of vehicle. I have not found a breakdown of the relay centers in GM service info, there may be legends next to them, I am not certain.
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Friday, January 29th, 2010 AT 11:55 PM

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