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Cadillac DeVille Electrical/Lighting

151 messages,  Last post on Oct 27, 2009 at 1:37 PM

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What is this discussion about? Cadillac DeVille, Lights, Electrical, Sedan

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#121 of 151 Re: Cadillac DeVille dead battery [bossalways1024] by bolivar Jan 02, 2008 (5:05 pm)
Replying to: bossalways1024 (Jan 02, 2008 11:35 am) 1) This could be as simple as a bad battery. Especially if this is the original battery. Which would be 5 or 6 years old, and has every right to die. This battery is probably under the rear seat, which you can just pull straight up at the front, and there's the battery. (If you get back to the battery, tighten down the cable connectors where they go into the battery. The black, negative cable grounds to the body right there under the seat. Be sure this bolt is screwed down tight. {This was a problem on my 2005 Deville just a few weeks ago.})   You should be able to bring up the battery voltage on your DIC display by pushing the INFO buttons. Check that when the car is running you have at least 13.5 volts. More, up to about 15.0 volts is good. If you don't have this voltage running, you have other problems, such as alternator bad. But if a bad alternator, it should be showing an error message on your DIC display.   If the car will not start, the battery voltage is obviously low. But, if you are driving it every day and it is starting, here is something to do. Drive the car 20 miles or so - enough to get a good charge on the battery. More miles would be better. Turn everything off. Radio, AC/Heat, Lights, keep door closed, etc. Stop the car.Turn the ignition back to 'Run' position, but do not start the car. Bring up the battery voltage on the display. A nicely charged battery should show from 12.2 to 12.6 volts. If your battery, right after being charge up nicely, shows something less than 12.0 volts, your battery is probably 'bad'. If you can sit there a few minutes, and you see the battery voltage decrease, you also either have a bad battery (losing voltage quickly due to weak cells), or you have a huge power drain somewhere.   Most auto parts houses will also 'load test' a battery for free.   If the battery appears good, finding the drain is something an tech with experience in electrical systems is going to be needed. Does the car have Onstar? Cadillacs of about this age had problems with the Onstar module draining the battery. Whether Onstar was active or not. Otherwise, the drain could be in many places, your Caddy has lots of electronics in it.   2) Your car has a rear, self leveling air suspension system. There is a small air compressor near the rear tires. Every time the car starts, this system goes thru a 'self test'. The compressor starts and raises the car a little. The system then exhausts air back to the correct level. This is what you are hearing. I think the system will even do this with the ignition in Run, without starting the car, and you can very easily hear all this. It takes about a minute to go through all this. Of course, with your battery problems, I wouldn't be draining the battery by doing this (the compressor uses electrical power) until you get the battery/electrical problems resolved.
#122 of 151 Re: Cadillac DeVille dead battery [bossalways1024] by bolivar Jan 02, 2008 (5:15 pm)
Replying to: bossalways1024 (Jan 02, 2008 11:35 am) P.S. 'Battery Saver Mode' - Read your owner's manual. It describes this.   Some of the electrical system is probably not protected by the 'Battery Saver', so you could still have something that is draining the battery.
#124 of 151 Electrical Issue by dmagick Dec 21, 2007 (4:45 am)
I own an '86 DeVille. My problem is new. Whenever I turn on an accessory or the headlights they will periodically go dim then back to normal, same with the interior lights, etc. There is no decrease in engine power or idle speed, just the accessories acting funny. Any help out there? Replies to this message: bolivar (Dec 21, 2007 11:31 am)
#125 of 151 Re: Electrical Issue [dmagick] by bolivar Dec 21, 2007 (11:31 am)
Replying to: dmagick (Dec 21, 2007 4:45 am) -Bad alternator. -Bad cables.   No need to start a new thread, there is an Electrical/Lighting one. The host will probably move these there....
#126 of 151 electricall issue by engwang9091 Jan 05, 2008 (8:10 pm)
i have a 2001 cadillac deville. My power windows sometimes just stop working. It wont go up or down. After a a couple of days it starts to work again. It keeps doing this on and off Replies to this message: bolivar (Jan 05, 2008 11:32 pm) alimo1 (Mar 03, 2008 6:37 pm) bolivar (Mar 04, 2008 2:18 am)
#127 of 151 Re: electricall issue [engwang9091] by bolivar Jan 05, 2008 (11:32 pm)
Replying to: engwang9091 (Jan 05, 2008 8:10 pm) One window or all windows? If one window, is it dead from the door switch and the driver's switch? Replies to this message: alimo1 (Mar 03, 2008 6:37 pm) bolivar (Mar 04, 2008 2:18 am)
#128 of 151 Re: 1986 Cad Deville [vandusen] by lawman5 Feb 18, 2008 (6:29 pm)
Replying to: vandusen (Sep 28, 2007 7:06 pm) sir did you find out why fuel+heatand a/c read out not working ?acquired a1991 sedan de ville it has the same problem all fuses are good   Sir: I have acquired a 1991 Sedan Deville with the same problem you had. Fuel guage inope plus heat/ac - no readouts on either. Any recommendations you have would be appreciated. Hope you fixed your problem.
#129 of 151 Re: electricall issue [bolivar] by alimo1 Mar 03, 2008 (6:37 pm)
Replying to: bolivar (Jan 05, 2008 11:32 pm) I have a rare problem, 2001 DeVille rear passenger door window, the window stopped working from both the passenger door switch and the drivers door switch for the rear window, replaced the door window switch and replaced the drivers switch, checked all the connectors and wiring........ the window works ( up/down )off both switches when the rear door is open, as soon as you close the door the window fails to operate from either switches ! Anyone had this problem and what is the fix ? My guess is the module in the rear door but would appreciate it if anyone can throw a little light on the problem. Replies to this message: bolivar (Mar 04, 2008 2:18 am)
#130 of 151 Re: electricall issue [alimo1] by bolivar Mar 04, 2008 (2:18 am)
Replying to: alimo1 (Mar 03, 2008 6:37 pm) Well, I've read where the later model Cadillacs do have a 'module' in each door. I really don't know what this module controls.   But from your description of the problem, I would also suspect a pinched wire, possible inside the rubber boot that covers the wires where they go from the body to inside the door.

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