SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Passenger Side Bench Seat Heater Not Working

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Old 11-14-2020, 12:00 PM
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1999 SL 500 & 2011 E 550 4Matic
Passenger Side Bench Seat Heater Not Working

Where would I start to try to fix this myself?
Is there a fuse for the bench alone? The back works.
Is there a weak point in the wiring?
Does the element eventually burn out?
Old 11-14-2020, 01:16 PM
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After some Google research:
- I note that the switch lights (1) or (2) both light up.
- I note that the yellow wiring connection at the back of the seat is plugged in.
- I think I can feel heat coming from both bolsters. But not the interior seat cushion.




Last edited by ChrisB; 11-15-2020 at 01:46 PM.
Old 11-14-2020, 11:51 PM
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The yellow connector isn't for the seat heaters.

Pull the seat cushion (two screws) and inspect the 2 seat heater connections by independently applying power to the separate heaters and see what works.

Yes, the heating elements (fine wires) are somewhat fragile.
Old 11-15-2020, 01:53 PM
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I found someone who posted that they switched a bolster wire to the inner seat wire to improve.
His broken wire must have been upstream of the elements.

Another fellow located a break in his bolster wire and soldered it back together.

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