JAY ALAN

I parked the car for 6 months, the battery was dead so I jumped it with a charger. It now runs with a high idle,the abs light stays on,the fan blower will not turn off, the passenger front seat is moving even after the key is removed from the ignition, this drains the battery dead. I replaced a blown fuse in the ovp relay and one in the fuse box, same results after replacing fuses. Thanks for any ideas you might have

gjonesgrad

You may try another forum...BenzWorld.org. Seems like the things I post on here don't get answered as fast.

number_one_c55

Please provide more info. The ABS and idle issues sounds like a OVP relay. You are not supposed to JUMP start these cars. You run the risk of blowing OVP relays or worse control units $$$$. The seat on the W126's are supposed to move even with the key removed. Either one of the front doors have to be open in order to adjust the seat even with the key out of the ignition. Try sitting in the car with the key out and all the doors and try moving the seat. Keep me posted!

number_one_c55

Even though you have replaced a fuse in the OVP relay it is highly possible that it has failed internally. There are a series of solder connections inside the OVP relay which break off after time and on a 22 year old S-Class this is quite likely.

JAY ALAN

when I connect the terminals to the battery it sparks, must have a dead short. After I start the engine the ovp relay fuse blows, fuse 15 which is for the control unit seat adjustment is shorted to ground on the input side of the fuse holder, which is the bottom of the fuse holder.
The seat still moves with fuse 15 removed, key removed, door shut.
Thank you for your help.

BENZITCH

Fuse 15 controls the memory in the seats as well as the factory alarm and locking system, not the movement of the seats. Replace the OVP after getting a new battery. If your battery isn't putting out at least 14.5 amps than you will see problems of an electric nature.