Before you take the seats out, swap the relay from the seat that works to eliminate that first.

If the relay still does not work the seat, pull the seat control buttons off the control box, remove the cover and spray some contact cleaner into the switches. Work the switch levers back and forth to work the contact cleaner into all the crevices.

If still no luck, check all the wiring for splits and cuts.

Remember there are two motors for the seats and it is unlikley that both have gone at the same time.

Swap over the switch from the working seat.

If this works then suspect the switch on the defective seat.

These are quite dear to buy but you can get the same switch for early mecedes cars from Euro car parts, they are the same.

Thanks but not sure which the relay for the seat is. If you could id it I would be very grateful.

charles b said:

Thanks but not sure which the relay for the seat is. If you could id it I would be very grateful.

Click to expand...

There are two relays under the front passenger seat, one for each seat.

Left hand looking forward for left hand seat.

Thanks for that, just a thought but do you know where the wiring splits on the lhs front central locking accuator. Ihave the panel off and a replacement to go in but was expecting to be able to split the loom near the lock. It seems as if the connector is by the leading edge of the door and it doesn`t seem very easy to thread the wiring thru the inside of the door panel.
Any thoughts appreciated.

charles b said:

Thanks for that, just a thought but do you know where the wiring splits on the lhs front central locking accuator. Ihave the panel off and a replacement to go in but was expecting to be able to split the loom near the lock. It seems as if the connector is by the leading edge of the door and it doesn`t seem very easy to thread the wiring thru the inside of the door panel.
Any thoughts appreciated.

Click to expand...

What is wrong with your central locking?

Actuator does not work on that door, not too bothered as I have a donor classic to get the bits from.
Thanks for your help.