Audi UrS6 seat heater failure diagnosis






The Question:
> Any hints on how to isolate whether an S6 driver's side seat 
> heating element is bad? Fuse is ok. Switch lights up when on. 
> Anything else I should check before shelling out $$ for 
> a new element? 




    Assuming it's the same as the 94, which is probably pretty likely, 
    here's the info.  

    Locate the 6-pin green connector under the seat.  

    Pin 1 is a blue/yellow wire that is the power feed from the 
    controller in the dash.  This connects to one side of the seat 
    element.  Pin 3 has a brown wire that connects one side of the 
    backrest element to ground.   Pins 5 and 6 are connected together 
    by a brown/blue wire.  Pin 5 is the other side of the seat element 
    and pin 6 is the other side of the backrest element.  

    The brown/blue wire connects them in series.  

    To run a thorough check, make sure you've got +12 on pin 1 and 
    +0 (ground) on pin 3.  If that's ok, check the voltage at pins 
    5 and 6.  If it's +12 the backrest is out, if it's +0 the seat 
    is out, and if it's +6 everything is OK and you need to go back 
    to square one.  You can pull the plug and verify the resistance.  
    I think a good element is between 1 and 2 ohms.  Pins 1 and 5 
    are the seat, and 3 and 6 are the backrest.

    The switch lighting up means nothing.  It's not associated with the
    wiring to the heater elements.

    I just got a seat element from Clair for $111 (list is $131).  
    Trouble is I need the backrest so it will be going back and 
    I'll get to find out how much the backrest costs.

    Wayne Dohnal