Just an update for anyone changing fabric seat base only. The TPS part number is 7LA963555C
[Guide] Heating Seat Failure And Repair
- Thread starter Robert
- Start date
SICAdler89
New Member
Hello,
My heated seats are not working. I checked a fuse but everything is fine.
I took it apart and now I see it is not burned out.
A quick check with an ohmmeter shows 20 ohms resistance in the driver's cushion element and 24 ohms in the backrest element.
Can anyone tell me if these are normal values or if they are faulty?
My heated seats are not working. I checked a fuse but everything is fine.
I took it apart and now I see it is not burned out.
A quick check with an ohmmeter shows 20 ohms resistance in the driver's cushion element and 24 ohms in the backrest element.
Can anyone tell me if these are normal values or if they are faulty?
Yes, you are correct. I checked and the back rest heat pad is faulty but I can't find the correct replacement.
To add to the list of my T6 woes, I now have a failed heated driver's seat. Thanks though to @Robert, I have a fighting chance of fixing this problem.
Only curiosity I have is that my seat has not totally failed. You do get a wee bit of heat after a while but much reduced from normal.
Measuring the resistance of each pad I get 1.2Ohms for the back rest and 13.8 Ohms for the base (confirmed measured 15Ohms at the main plug since elemenrs are connected in series). Given that heated seats typically use about 50 Watts of power, I'd have expected to see a total resistance of ~3Ohms (V^2/R, 12^2/3 = 144/3 ~48W). At 15 Ohms, I'm only getting ~10W which explains why I have a cold bottom.
So, I'm guessing I need a new seat base element (7LA963555C thanks @LambethBoy). Just wondered if anyone could confirm my thoughts on resitance and let me know what the base resistance shoud be? I know I could remove my own passenger seat to measure that one but I've run out of time this week for driveway wrenching.
Plus, holy cr*p, these parts have got expensive. Seems they used to be ~£50. Now they are more like £150!
Cheers, Cuiken.
Only curiosity I have is that my seat has not totally failed. You do get a wee bit of heat after a while but much reduced from normal.
Measuring the resistance of each pad I get 1.2Ohms for the back rest and 13.8 Ohms for the base (confirmed measured 15Ohms at the main plug since elemenrs are connected in series). Given that heated seats typically use about 50 Watts of power, I'd have expected to see a total resistance of ~3Ohms (V^2/R, 12^2/3 = 144/3 ~48W). At 15 Ohms, I'm only getting ~10W which explains why I have a cold bottom.
So, I'm guessing I need a new seat base element (7LA963555C thanks @LambethBoy). Just wondered if anyone could confirm my thoughts on resitance and let me know what the base resistance shoud be? I know I could remove my own passenger seat to measure that one but I've run out of time this week for driveway wrenching.
Plus, holy cr*p, these parts have got expensive. Seems they used to be ~£50. Now they are more like £150!
Cheers, Cuiken.
Last edited:
TPS should be able to give you the part number!?
Tried that but they won't give me the part number.
Some are fitted / stiched directly to the seat cover and some are glued to the foam base. I’m guessing yours will be the same as @Robert at the beginning of this thread.
See here for backrest.
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[Guide] Heating Seat Failure And Repair
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