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Ask Michael Warfield Your Own Question
Michael Warfield
Michael Warfield, Factory Mercedes-Benz Technician
Category: Mercedes
Satisfied Customers: 3142
Experience:  Mercedes-Benz Master Certified technician
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I have a 1999 ML320, I replaced the driver and driver side

Customer Question

I have a 1999 ML320, I replaced the driver and driver side passenger door, now my air bag light is on and my windows dont work on that side. Do I need to reset something?
JA: Is anything interfering with the seatbelt latch?
Customer: no
JA: What is the make/model of your car?
Customer: 1999 ML 320
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: yes. i had problem with door lock and window regulator, so I found a wrecked ML320 the same color, so I changed the entire door
JA: What year is your '99 ML320?
Customer: Mine is 1999, the one I found is 2002
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 8 months ago.
Category: Mercedes
Expert:  Michael Warfield replied 8 months ago.

I know this sounds remedial, but are the door harnesses connected properly? Are you sure the windows worked before you replaced the doors? Can you hear anything happening in the door when you try and move the window switch? Do the door locks work on that side?

Customer: replied 8 months ago.
There was no damage to that side of the vehicles, so I would assume the window worked! No, i don't hear any sound when I try the locks either.
Expert:  Michael Warfield replied 8 months ago.

There must be a connection problem. Did you replace the doors your self?

Customer: replied 8 months ago.
Expert:  Michael Warfield replied 8 months ago.

And all the connectors were the same on both doors? The door separation point at the jamb looks ok?

Customer: replied 8 months ago.
connectors and everything were the same.
Expert:  Michael Warfield replied 8 months ago.

I'm researching the wiring diagrams right now, so give me a few

Expert:  Michael Warfield replied 8 months ago.

I'm attaching a picture of the connector for the door separation point. I have a feeling they aren't installed or seated properly. Can you disconnect the driver's front door and measure voltage at pins 7 or 8 when actuating the window switch.

Expert:  Michael Warfield replied 8 months ago.

I would just take the door panel off and measure the resistance to ground at the ground wire for the door lock. That would confirm you have a good connection through the separation point. The only thing in common is the front fuse box assembly (All Activity Module) and that powers up the other doors as well so I doubt you just shorted the side that you replaced.

Customer: replied 8 months ago.
ok , it will be tomorrow before I can check it.
Expert:  Michael Warfield replied 8 months ago.

Ok, great. I'll be around. I think the website or my computer was having trouble connecting just recently in case you were wondering about the prolonged response.

Expert:  Michael Warfield replied 8 months ago.

We're you able to check the door yet?