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Heated Seats Just Stopped Working Need Help 2000 Deville


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Heated seats front and rear just stopped working. Last night they worked this morning no go. All the switches light up as should. All the fuses look good unless there are more fuses I need to check. I checked the ignition relays and they seem good also. This may or may not have happened after I disconnected and reconnected the battery. I don't think all the elements can go bad at once and if they did I should play the lottery. Something must be causing these seats to not work all at once. No codes. There has got to be one main source that sends a signal to all the seats. I don't buy that this is a individual seat problem because they all went out at once. Is there a module or something that commands the heated seats? 2000 Deville

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There is a RIM (Rear Integration Module)

Check for codes and see if there are any codes.

I have a 98 Seville but I'm pretty sure the components are the same, the locations are probably changed to protect the innocent.

The IGN 3 fuse powers the RIM on mine.

THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!!

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THANKS BUT LIKE i SAID NO CODES, AND THE FUSES ARE GOOD. I DON'T KNOW WHERE TO PROCEED FROM HERE AND TAKING IT TO A DEALER WOULD PROBABLY COST ME A FORTUNE.

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Okay, i seen the "no codes"statement, but I also saw the statement about disconnecting and reconnecting the battery - sorry, but that always sets a code.

If you want to reset the modules, disconnect both battery cables and touch them together ( away from the battery of course). That will clear any transient power / memory. Or you can disconnect both battery cables and leave them disconnected for 20 minutes.

i could be mistaken but I think there is a power/fuse center under the rear seat or in the trunk on the Deville, that's why I gave you the IGN 3 fuse information. If the under hood fuse block is the only one you checked you need to find the other fuse block.

THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!!

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I did the touching of the cable thing for another reason and that's what may or may not have caused my heated seats not to work because they stopped working right around the time I did that. The fuse box where I have been checking is indeed in the trunk because all the power in the heated seat system runs thru that box and all fuses and relays are good. I never checked any thing under the hood because nothing points in that direction.

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The heated seats on the 2002 models (should be the same) are driven from the door modules.

Any problem will set a Bxxxx code. Most simple code readers only show Pxxxx codes. The A/C and DIC method *will* show the Bxxxx codes.

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Jim can you expand a little bit on the modules? From what some people told me there is one module under the front seat for the front and one module under the rear seat or back there somewhere for the rear seats. This has really got me stumped. There are no codes and the heated seats worked Tues night and when I went to work Wed morning they didn't. All four seats cut out at once. Doesn't that seem strange and with this symptom shouldn't it be a little easier to narrow down the cause. It's kind of obvious that one single thing is effecting all four heated seats to all not work at once. Don't forget I said no codes are present.

Edited by Ron 2000
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Did you have the rear seat cushion out? If so, did you reconnect the seat connector (blue)?

Did you disconnect the small connectors at the battery cable ends?

THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!!

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Did you have the rear seat cushion out? If so, did you reconnect the seat connector (blue)?

Did you disconnect the small connectors at the battery cable ends?

Yes the rear cushion was out and I did disconnect the blue wire but made sure it was reconnected properly. The small connectors from what I remember were in place and I never touched them. I will double check them anyway. Isn't the blue connector just for the back anyway? I was also thinking that if I turn the rear seat heater on and disconnect the blue connector and put a test light on it, that would be a great way and easy way of telling if the rear cushion is getting power. If that lights the test light then I know something is wrong with the seat cushion element.

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Yes, The connector is just for the rear, but if you left it disconnected the rear heaters would not work and would skew your diagnosis. If you have a DMM it would be better to check the voltage at that connection. Do you have, or have access to a repair manual or schematic of the circuit?

There should be four fuses in the fuse/relay box under the rear seat; could be numbers 6, 16, 31, and 37 and they will be identified as HTDST followed by LF, RF, LR, RR. Ten Amperes.

Maybe this will help ----

heatedseat_zpsk33xrs8l.png

THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!!

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I disconnected and reconnected the battery because I am getting a C1252 and C1253 (C1252 Left front normal force malfunction and C1253 Right front normal force malfunction ) code that doesn't go away when you clear the codes from the dash. Probably the module connected to the ABS pump. Anyways after one last clutching at straws move I disconnected the battery again and touched the negative and positive cables for 30 seconds to clear all memory. This is the third time I tried this. Guess what, this time it worked and the seats work again. A mechanic friend of mine said I hit a million to one shot as probably the same way I disrupted the modules when I disconnected the battery they somehow reset when I did it again. Sort of like rebooting a computer. Why only the heated seat modules reacted this way when I originally disconnected the battery is anybody's guess and we will never know, but they work now! I wanted to post the outcome of this so I didn't leave this thread hanging with no resolution. What I did was not a cure because as far as I can tell I caused the problem in the first place. And thanks OLD TECH for sticking with me throughout this thread.

Edited by Ron 2000
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