Mercedes clk 230 1999 electric seat problem
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CLK230 Convertible 2000
Mercedes clk 230 1999 electric seat problem
Hi, my MY 2000 clk 230 has a seat problem.
both drivers and passengers seats will only move forward.
if i push the seat control forward, seats go forward.
if i push backwards, seats go FORWARDS.
there is no water ingress, fuses are both in good order.
the seats move! So i assume the motor is good.
the seats move! So i assume the door switches are good.
the seats move! So i assume the underseat modules are good.
where and what should i be looking for or at.
also does anyone have a wiring diagram of the seat electrics and which fuses, relays need to be checked.
many thanks in advance.
lastly, how do i move the seat back without using the switch, is there a manual way to do it.
both drivers and passengers seats will only move forward.
if i push the seat control forward, seats go forward.
if i push backwards, seats go FORWARDS.
there is no water ingress, fuses are both in good order.
the seats move! So i assume the motor is good.
the seats move! So i assume the door switches are good.
the seats move! So i assume the underseat modules are good.
where and what should i be looking for or at.
also does anyone have a wiring diagram of the seat electrics and which fuses, relays need to be checked.
many thanks in advance.
lastly, how do i move the seat back without using the switch, is there a manual way to do it.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
Likes: 209
From: Boston North Shore
2001 CLK320 Cabrio
I believe you'll be able to solve the problem you describe, by simply resynchronizing the seat's forward/backward motor, by moving the seat fully forward and holding the switch for 5 seconds, followed by moving the seat fully backward and holding the switch for 5 seconds.
Note: To enable all the seat features, all of the seat motor(s) off/on limits, directional control etc., are determined by counting the motor's shaft revolutions, upon which the seat controller then adds/subtracts the stored motor revolutions. Should the resynch above not immediately correct the problem, move the seat using one of the stored seat memories and then repeat the full forward/backward/hold procedure.
Note: To enable all the seat features, all of the seat motor(s) off/on limits, directional control etc., are determined by counting the motor's shaft revolutions, upon which the seat controller then adds/subtracts the stored motor revolutions. Should the resynch above not immediately correct the problem, move the seat using one of the stored seat memories and then repeat the full forward/backward/hold procedure.
Last edited by Serndipity; Mar 31, 2018 at 10:40 AM.
Thread Starter
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Joined: Mar 2018
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CLK230 Convertible 2000
Hi serendipity.
i am not sure if the original post was clear.
the seats will only move forward.
they will not move backwards.
push tbe seat switch backward and the seat will still ONLY move forward.
also, how can i move the seats manually, without power.
i am not sure if the original post was clear.
the seats will only move forward.
they will not move backwards.
push tbe seat switch backward and the seat will still ONLY move forward.
also, how can i move the seats manually, without power.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
Likes: 209
From: Boston North Shore
2001 CLK320 Cabrio
drustan595......your original post was quite clear/understood.
Usually, when the seat gets stuck in the forward position, it's because the motor shaft rotation values, that start/stop the motors and directional movement, are out of kilter, which can be restored by the reset procedure that I noted above.
I've read one variation of this procedure, that also mentioned that the door should be open and seat unoccupied, when doing the reset.
If this fails, the seat can usually be moved backwards, using one of the stored memory buttons, which I understand your vehicle is not equipped with.
As shown in the enclosed functional diagram, voltage-coded signals from the power seat switches are read into the associated door control modules (N69/1, N69/2). Then, the door control modules (N69/1, N69/2) send a CANBus message to the associated electronic seat adjustment control modules (N32/1, N32/2) which actuates the seat adjustment motors.
When the memory functionality works or all the other adjustable seat positions work properly (up/down, seat back, headrest), would suggest that switch group fore/aft switch might be faulty, which could be checked out with a multi-meter. Note: To save on wiring, the signals from the switch group to the door control module are voltage coded, which means a properly operating switch would show 2 different resistance measurements, in ohms, between the fore/aft positions.
