Convenience circuit diagnostic terminal - where is it?
 

I've got a water logged 1992 300D 2.5 W124. The only window that is working since it got wet is the drivers side rear window. The rest of them don't do anything. The 'convenience' relay N57 in the floorboard at the back clicks when I push the window switches.

I have checked the switches, they're good, and there is good voltage at the switch terminals.

So I'm trying to get the diagnostic codes for the convenience system, and which terminal I use with the flashing LED thing I made for the engine codes.

I have the FSM, but haven't found anything in it (or on the forum actually)

Anybody know where the diagnostic codes for the convenience system can be found, or if there is some other place I should be troubleshooting?

Thanks

on the 107's it is located on the left of the bay next to the sidewall . . . It has a black screw on cap, approx 1 inch in diameter. . I think the 126's are similar, Id figure the 124's are probably the same. .

OK, I found the little b'tard. It's actually easy to get to - the drawing on the FSM is misleading - it looks like it's in the floorboard, but it's actually under the back seat. Pull the back seat out and there it is.

All except one of the relays is working fine. But only 1 of the windows works.... I applied power directly to the motors and the windows all work. SO I'm guessing the CCU is funky. Weird that the relays click but the windows don't roll up. I'm thinking the contacts must be fouled from the water. I tried cleaning them but it's hard to get in there.

Thanks for making an effort Lexani, I appreciate it.