I have a 2002 CLK430 that the driver seat will not move forward and back, all the other adjustments work except that one

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Seat adjustment ranges are sometimes limited and sometimes there is a fault, such as a coin or something falling into one of the runners.

Cars intended for the premium market often have forward/back, up/down and sometimes tilt adjustment for the driver seat while for the small car, basic or budget market usually only have forward or back. Because on average a person who has shorter legs and needs the seat forward will also have a shorter body so enterprising designers have made the seat runners of some models slope upwards to lift the driver as the seat is moved forward.

Adjustable steering columns are fairly common, though only in the rise/fall plane. I haven't seen a telescopic column for many years. What is really needed is adjustable pedals but designers and manufacturers are very reluctant to go down that avenue, though there are companies specialising in such modifications.

You need to be on the ground on your knees with a good light looking under the seat to see if the available adjustment range takes the seat to the true limit of its travel in both directions.

The automatic driver's seat may have been programed not to move forward when the key is in and go back when it's taken out. Or are you saying it doesn't move forward, back and not at all from the control on door panel?

You must remove the motor, move the seat to the desired position and then reinstall the motor to lock the seat in the position.

I had the same problem the passenger seat stopped working
I located the problem in the motor , i send the 12 volts to the black and white wire
needed a chik start with my fingers once start to spin was ok
the same in reverse polarity
seems a dead spot on the motor , part number of the motor is 2088200842Temic 12v 083314gp41a35h210801-a2b

cud be the switch or somethin lodged between the motor-try vacuuming-dont keep tryin cause motor will draw more amps

On ABS light most common problem is ABS control module , they failing left and right.
As for the seat adjustment , sound like you need a new seat switch.

I have a 2005 Jeep Liberty and the smae lever that tilts the seat also moves it forward and back. Press forward or back on the switch. Also check for blown fuse or a loose wiring connector under the drivers seat. Good luck, Techjoel

I just had the same problem. When the seat is powered all the forward, one of the worm drives reached the end of its travel and jammed against the threaded block that it passes through. To fix this the seat has to be unbolted and tipped back. There are four tiny 6mm bolts that hold the motor plate in. Remove these and the motor will come out. The worm drive is bolted in at one end and has a set pin at the other. Remove the worm drive and use a couple of vice grips or equivalent to loosen the threaded block from the worm drive.

Motor on the seat may have gone out, contacts in switch got dirty or worn, or assembly reached limit and stuck. Try sitting in it pushing back hard and adjust. If not youll need to replace switch,b take seat apart to fix or replace.