Vacuum door lock quick 1989 300E
 

1989 300-e W124 M103 six cyliner engine. Noticed vacumn door locks, trunk and gas door just quit. I check the Mercedes-Benz CD on the W124 series very confusing to me.
I was told to check fuses the fuse that controls the door vacuum locks also work the electric antenna, that works and the fuse looks good. How can I proceed what is next to check.

I also tried to use the passender door and trunk with the key also no response. could it be the vacuum pump under rear set?

Could use some solid suggestions.

Thank You
bob Geco
1989 300-E sedan

First of all...
 

it is not possible to tell, by reading your message, what works and what doesn't. Please redo it so that those who have knowledge and are willing to share it can help.

Can you hear the pump run?

If so, very likely you have a broken vacuum line, there is only one (vac to lock, pressure to unlock). If the pump does not run, you will have to check the wiring to it for power (the connector can come off). If it has power and does not run, replace it.

Peter

Check the wiring if the pump doesn't run...
 

Under the carpeting, in front of the rear seat on the passenger side, there is a connector with five (5) wires...and they corrode!...

Remove the rear seat...run the front passenger seat up towards the front of the car as far as it will go....remove the trim so you can peel up the rear carpeting and in the channel wrapped with tape, you will find the connector. (I think the wires are red). Mine were green with corrision...

I soldered the connections and that solved the problem...

There are posts with photos in this forum...seek and you will find....very helpful.

The Tenor Man