1999 Deville warning lights
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 1999 Deville warning lights in Past Cadillac Vehicle Discussion; Just started this morning. When I start the car, all of the warning lights seem to stay on a while. ...
  1. #1
    johnrgregory is offline Cadillac Owners Fanatic
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    1999 Deville warning lights

    Just started this morning. When I start the car, all of the warning lights seem to stay on a while. Then all of them disappear except the ABS and traction control lights, they stayed lighted all the way to work. Nothing seems different driving the car. Any thoughts about what I should check? Would reading the codes give me more information?

    Thanks in advance for your help
    John

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    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: 1999 Deville warning lights

    Reading the codes will ALWAYS give you more info and should be the first thing you do.

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    johnrgregory is offline Cadillac Owners Fanatic
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    Re: 1999 Deville warning lights

    Thanks Ranger, I will have to do that after work

  5. #4
    Team ZR-1 is offline Cadillac Owners Member
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    Re: 1999 Deville warning lights

    Also do a load test on battery as a weak cell will cause odd conditions and also check battery post connections clean and tight

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    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: 1999 Deville warning lights

    You will need a tech 1 or tech 2 scanner to read ABS codes, those can't be read onboard.

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    They can on a '99.

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    johnrgregory is offline Cadillac Owners Fanatic
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    Re: 1999 Deville warning lights

    I checked with Autozone, the battery is 4 years old, I will have them test it and I might as well have them read the codes while they are at it. I remember now that when the battery went bad, it manifested the problem in odd ways.

  9. #8
    Team ZR-1 is offline Cadillac Owners Member
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    Re: 1999 Deville warning lights

    If the battery is the root of the problems then the DTCs shown now could be bogus
    If replacing battery, then clear DTCs and start clean to see if any valid DTCs trip

  10. #9
    johnrgregory is offline Cadillac Owners Fanatic
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    Re: 1999 Deville warning lights

    I went down to the parking garage and got the codes. Most are marked as history or no codes. There are only two current codes IPC U1255 and SDM U1255. Something about "Class 2 Communication Malfunction and Serial Data Line Malfunction. I am not sure what that tells me. I will clear the codes and see what comes back.

  11. #10
    Team ZR-1 is offline Cadillac Owners Member
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    Re: 1999 Deville warning lights

    Both codes are comm DTCs which mean the controllers could not talk on the car's Starbus network
    This is more common when battery issues and controllers are not getting enough voltage level to function correctly

  12. #11
    johnrgregory is offline Cadillac Owners Fanatic
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    Re: 1999 Deville warning lights

    UPDATE
    Yes it was the battery. I replaced it and after a few miles the warning lights went off. Bad batteries in the Deville does strange things. I think the battery replacement made another issue go away. The engine used to "stutter". Kind of like a miss, but not quite. The RPMs would slow momentarily. Mostly while idling at a stop light or backing out of the garage. The car seems to run smoother now at all speeds.

  13. #12
    rodnok01's Avatar
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    Re: 1999 Deville warning lights

    Yes these are very picking about voltage and grounds. Replaced the battery in my 98 at holidays just because of flaky things happening and they went away.

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    johnrgregory is offline Cadillac Owners Fanatic
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    Re: 1999 Deville warning lights

    I had Autozone test my battery a few months ago, because I thought the engine was turning over slowly in the cold weather. At that time the battery tested as good. This time it did not. It was still under warranty.

  15. #14
    johnrgregory is offline Cadillac Owners Fanatic
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    Re: 1999 Deville warning lights

    My celebration was premature. The warning lights came back on, then off for a few hours, not back on. ABS and Traction Control lights. The ABS light blinks sometimes and is solid other times. I am thinking of taking the dremel with a wire wheel and polishing the batter cable connectors. They don't look bad, no corrosion but the electrical is so finicky on these cars. Is there a way to clear all codes at once? Or just by each category?

    ----------

    Another question...How long does it take for a code to go from "current" to "history"? Once the issue is no longer an issue?

    ----------

    These are my current codes as of yesterday
    PCM P1602
    IPC U1255
    SDM U 1255

  16. #15
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    Submariner409 is offline If it won't run, chrome it
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    Re: 1999 Deville warning lights

    Codes in your system ............. Different types of codes are affected in different ways........... It takes one or two fault detections to actually set a code or turn on a warning/light/icon. As long as the startup and running checks detect the fault the code stays Current and the warnings remain. BUT, if the code was a transient hiccup (no permanent fault) it will go to History after 3 start-run events during which the code does not set. If the fault is then not detected for 30, 40, 50, 100 start-run cycles (Code-type dependent) then it self-clears from the system memory.

    Does your system ask, at the end of the module scroll sequence "CLEAR ALL CODES ?" If you want to, hit YES.

    If you practice the code pull-read sequence several times and get creative with the yes/no commands you can either let the system do its own scrolling or you can step through one module at a time as well as clear codes from only one or more specific modules.

    In the DIC control system that uses the 3 buttons to the right of the DIC, you enter the system. ^/v remains a scroll button; INFO RESET becomes NO; ON/OFF becomes YES. Enter diagnostics - the DIC asks "ALL ?" - you answer NO. The DIC asks "ALL CODES ?" - you answer NO. Now the system will display, one at a time in alphabetical order, each module - you use the NO/YES buttons to perform functions in each module, then step to the next module.

    To exit at any point, simply turn OFF the ignition key.

    Use the link in the "How to pull codes" sticky ^^^ to get definitions of found codes - we don't have all of them memorized yet ..............

    N*Caddy or JimD, When did the DIC/instrument panels gain the ability to enter the diagnostic systems ?

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