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General E46 Forum
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Old 10-10-2012, 05:24 PM   #1
rd5150
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seat heater problem

the drivers seat in my 02 325i is not heating properly. the bottom cushion gets extremely warm on any setting, and the back does not heat at all... or if it is, it isnt noticeable.

I looked through realoem but didnt find anything really descriptive about how the heater works. has anyone repaired these? is there a chance that something just became disconnected in the backrest and is causing the lower cushion to overheat? aside from the switch in front of the shifter, and the heating elements, are there any other components? and if necessary, wheres the best place to get new heating elements?
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Old 10-10-2012, 07:06 PM   #2
dmax
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There's a chance that the connector for the back seat grid is just unplugged.

My bottom grid got messed up from me kneeling on it...and that stopped my entire seat heat from heating. If I recall, it's a small two wire connector somewhere in the back part of the seat bottom going up. There might be one for the lumbar adjustment if you have that too.

If you check wds.spaghettidecoder.org you should be able to find the wire colors you're looking for...if you can't find anything, call out and I'll check Bentley later.
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Old 10-10-2012, 07:17 PM   #3
rd5150
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alright, ill grab a flashlight... now if i could just get this 'B' pillar out of the way
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Old 10-10-2012, 07:27 PM   #4
dknightd
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I didn't even know the back would get warm too. Damn, I need to do a heated seat conversion. Is there a DIY retrofit out there?
Yess, I could google it, but what fun is that?
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Old 10-10-2012, 07:36 PM   #5
choxor
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Quote:
Originally Posted by dknightd View Post
I didn't even know the back would get warm too. Damn, I need to do a heated seat conversion. Is there a DIY retrofit out there?
Yess, I could google it, but what fun is that?
Yes, there is. Google it.
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Old 10-10-2012, 08:57 PM   #6
montchobadmoves
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Maybe this info can help you. habitually, if 1 heater failed, the others get more power, so you should check for the faulty one.
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Old 10-10-2012, 08:58 PM   #7
rd5150
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alright, disassembled the seat, and backrest. found the two wires i need. resistance between the two is 50 ohms when cold. i applied voltage for about 5 min and tested the resistance again, dropped down to 43. so does anyone know what the resistance is supposed to be for one of these backrest pads?

if nothing else ill measure the resistance on the pass side. however, i cant get to that side right now. and without the drivers seat in, its gonna be quite fun moving the vehicle out of its spot.
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