Central lock system

Tiny
CHARLES PIUSON
  • MEMBER
  • 1999 MERCEDES BENZ ML320
  • 15,234 MILES
When I lock from the driver's door of ml 320 Mercedes Benz the other doors do not lock and yet if I press the central lock button in the car all doors lock up together what might be the problem with the central lock system of the car. How is a central system of that car controlled. How many relays does it have and where are they located, how are their connected to one key lock at the driver' s door?
Tuesday, May 10th, 2016 AT 3:06 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,841 POSTS
Hey CHARLES,

It sounds like you have a problem with the door key switch which has connects that control the other doors. There are no relays just a central controller. Here is a wiring diagram, I would start at the drivers side door lock switch first

Let me know how it goes

Best, Ken
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Wednesday, May 11th, 2016 AT 7:22 PM

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