With some Mercedes Benz models there occurs a 'Dead spot' with the seat adjustment.
If you have checked fuses try pressing the fore/aft button and at the same time gently try to push the seat forward or backwards. If it does start to move under motor power, when it reaches the stop point it should then re-set itself and hopefully continue working.
The fuses are fine. The seat does move fore/aft when the memory button is pressed. The fore/aft switch does not make the seat move, however, it does still have the ability to make the seat tilt and adjust the height.
The motor is definitely working. The issue is likely either the control module with a loose wire; the door switch; or something totally different.
Perhaps there is a way to resync the seat control similar to the way the windows or sunroof can be resynched?
Al, perhaps a visual check to confirm that all wires, plugs and sockets are correctly in place would be a good idea. Then check the continuity of the door switch with a multi-meter. I will try to find out the colour coding of the switch wires and post back into this thread later.
Thanks for getting back to me. I conducted a visual check of the wiring, it appears to be fine. The connectors are all fine.
I have never used a multi meter (but can figure it out w/instructions), so could you explain how and exactly what I am supposed to hook one up to on the door control.
Have you ever heard of just one function of the seat controller not working? The fore/aft control lever also adjusts the seat height, which works. All the other seat/headrest/wheel functions work fine.
Just one other question, looking at my Alldata information on your model, it shows two seat adjustment switches, one on the door and the other on the side of the seat itself.
Does the fore and aft motor not work on both switches?
The only seat adjustment switches are on the door panel.
OK, then looking at the circuit diagram, M1 of the M20 seat motor group, I would suspect a fault in the driver seat module itself N32/1. If the memory function will operate the the fore and aft motor (M1) then the motor would appear to be OK.
The passenger side seat does share certain common parts of the electrical circuit but does have it's own seat module. Assuming that the passenger seat operates from the door switch without any problem then this would also suggest that the driver side seat module is at fault. (see photo)
You could try swapping over the modules for elimination purposes.
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