1994 Mercedes-Benz S320 Q&A
1994 Mercedes-Benz S320 Question: Power lock stop working,
I have a 99 its 320 and I had the exact same problem as you. While troubleshooting I found that my vacuum pump which is located under the rear seat on the passenger side, has quit working. I tested the pump and it is no good and must be replaced. I since then have replace the pump and everything is back to normal working condition. I hope this helps you and good luck - hellwelder13
I can no longer use power to lock and unlock doors, trunk and sunroof.Please help.