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1 Fault Found: 01218 - Side Airbag Igniter; Passenger Side (N200) 001 - Upper Limit Exceeded - MIL ON
Disclaimer: Do this work at your own risk, I am not responsible for any damage that happens to your car.
M50 driver bit
Electrical wire stripper/cutter
Solder gun and solder/flux
6 inches of 20 gauge wire
Appropriate sized heat shrink material
Disconnect your battery after unbolting the seat.
Driver's seat needs to be tilted back - there are 4 M50 bolts holding it down, remove them. Note that the seat will need to be moved forward and backward to access the seat rail bolts:
Audi likes to put these little trim parts over the seat rails. The need to come off to access the M50 bolts. Remove the small plastic retaining pin with a small flat screwdriver, then the covers will come off.
On the two rear seat rail covers, there are also small T25 screws that need to be removed:
This is also the PERFECT time to vacuum up all the crap that you normally can't get to, and get to that black hole area between the drivers seat and the center console:
Now it's time to disconnect your battery!!
Lift the plastic floor cover and carefully disconnect the plugs from the harness, then the seat can be tilted all the way back:
Here's where I forgot to take pictures. Basically find the little yellow plug, cut the blue and black wires on each side, and remove the connector. Don't cut any other wires!
Cut about 3 inches of your splice wire, and prep it to be soldered - I prefer to flux and tin each wire before making the final solder connection. Also make sure to have your heat shrink cut and ready.
Break out your soldering skills and solder those wires into the area where the connector was. The B6 Audi A4 only has two wires, yours may vary, but be sure to match the colors up like so:
blue --- blue
black --- black
Melt the heat shrink around your solder joints, and then use some electrical tape to secure them snugly together:
Take up any slack in the extra wire and zip tie everything back so it's nice and secure:
Install of the seat is the reverse of removal, do that, and be sure to reconnect your battery. Then you'll need to open VCDS, open your airbag module and clear the code that is still hanging around. And then you are fixed!