Re: Seat Relay
Originally Posted by JimmySkullz
How do you test the relay to see what part is fried?
I have a digital multimeter, but the diode I found to be at fault could be tested using a bulb and a battery.
Diodes only let the power through one way, I used the buzzer feature of the meter and found that power went through the good diode only one way, but the other diode did not let any power through in any direction. This indicated that no power was getting to the seat switch with the door closed and the ignition on.
If you can put your hand on the relay and open the door you can feel the relay 'click' as it opens, shutting the door you can feel the same click as the door shuts.
If you have good ears you can operate the door switch and hear the relay click.
The seats now operate with the doors open with the ignition on or off or with the door closed and the ignition on.
The Mercedes sites mention the fact that this relay may have dry solder joints that cause problems.
Last edited by onehundred80; 11-23-2011 at 06:43 PM.
Reason: Error corrected on switch function.