98 DeVille Heated seats
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 98 DeVille Heated seats in Past Cadillac Vehicle Discussion; The heated seats in my 98 cad work, except that if I turn on the drivers side heater, it stays ...
  1. #1
    gcad98 is offline Cadillac Owners Member
    Automobile(s): DeVille D'elegance1998
    Join Date
    Jan 2014
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    2

    98 DeVille Heated seats

    The heated seats in my 98 cad work, except that if I turn on the drivers side heater, it stays on after I shut the car off and overnight it will drain the battery. I put the switch on in the low setting and I believe the seat gets too hot for the low setting. I don't use the passenger side so I have not had this problem there. The indicator light on the switch does go on and off with the switch. Would this indicate a bad switch or is there something else in the system that is keeping the seat heater on after the car is turned off? Why does the power go to the seat after the car is turned off, shouldn't everything be off with the key being in the off position? I have removed the fuses for now so the battery does not drain. It's winter so I would like to use the heater, I hope someone can help me with this problem, thanks. Gary

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  3. #2
    kidzstang is offline Cadillac Owners Fanatic
    Automobile(s): '98 Cadillac Concours
    Join Date
    Jul 2007
    Location
    York, PA
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    Re: 98 DeVille Heated seats

    I have a 98 Deville and can only use the heated seats for a short time on low setting before my bum gets burned. Much different than my Jag that has a butt temp sensor that makes sure that my sensitive bum can't get too hot; consequently it doesn't heat up enough (go figure).

    I thought on the Caddy that there would be a relay but having a quick look at ALLDATA I see that there is something called the "heated seat module". There is one for each seat. That module takes the input from the selector switches and sends it out to the seat heat elements. The input to that module is hot at all times. It is for all intense and purposes the relay system for the high amperage current. I would suppose if that module is bad, or slow, or sticking, that you would have the problem that you are having. I haven't had experience with this but would like to be kept informed of the outcome; for future recall.

    Cheers,
    Jack

  4. #3
    gcad98 is offline Cadillac Owners Member
    Automobile(s): DeVille D'elegance1998
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    Jan 2014
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    Re: 98 DeVille Heated seats

    Jack, thanks for the information. Do you have any idea where this module is located so that I can replace it?

    Gary

  5. #4
    kidzstang is offline Cadillac Owners Fanatic
    Automobile(s): '98 Cadillac Concours
    Join Date
    Jul 2007
    Location
    York, PA
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    121

    Re: 98 DeVille Heated seats

    HI Gary,

    Alldata says that the part number may be 12110047? The location is under the seat. They do call it a relay module in some places so I suppose that a relay is stuck closed. (Skill level B for replacing it) in case you wanted to know. Let me know what you find out as I use my seat heat quite often (which may be better as the relays will get exercise).

    Cheers,
    Jack

  6. #5
    stoveguyy is offline Cadillac Owners Connoisseur
    Automobile(s): 03 STS
    Join Date
    Aug 2007
    Location
    mpls mn
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    2,494
    Think most 90's caddys had the relay mounted under front seat lip. My driver seat has no heat. Good fuse. Relay is quiet when I use console switch. Pass seat works fine, relay clicks. I swapped relays and now driver side does click but still no heat. Pass side does not click with swapped relay so it looks like seat heat grid and relay are both bad. Coincidence? And I also installed 2 different console switches.

  7. #6
    kidzstang is offline Cadillac Owners Fanatic
    Automobile(s): '98 Cadillac Concours
    Join Date
    Jul 2007
    Location
    York, PA
    Posts
    121

    Re: 98 DeVille Heated seats

    Quote Originally Posted by stoveguyy View Post
    Think most 90's caddys had the relay mounted under front seat lip. My driver seat has no heat. Good fuse. Relay is quiet when I use console switch. Pass seat works fine, relay clicks. I swapped relays and now driver side does click but still no heat. Pass side does not click with swapped relay so it looks like seat heat grid and relay are both bad. Coincidence? And I also installed 2 different console switches.
    Have you checked for current potential at the relay "always hot" feed for the control relay pack?

    Have you checked the continuity of the heater element feed wires (to rule out a break in the wire)?

    Try the relay pack from the driver side in the passenger side seat to see if the relay pack is bad.

    Cheers,
    Jack

  8. #7
    stoveguyy is offline Cadillac Owners Connoisseur
    Automobile(s): 03 STS
    Join Date
    Aug 2007
    Location
    mpls mn
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    2,494
    My grand prix seats are hotter than caddy pass seat. Perhaps my pass seat heat grid is so-so. The bun and seat back heat both work. Just don't feel real hot like the grand prix. The gp is 1 heat setting. ON. Caddy is low/hi. Low is wimpy and hi is so-so

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