every time i unlock the the master door lock driver's door the #c fuse blow's and the door lock's havent worked for at least 3 years but now
out of the blue the fues is popping,anyone have any idears?.

 

It's mostly likely either the lock actuating switch inside the door or a short in the wiring harness. There is a remote chance of a short in the vacuum controller itself. Most likely culprit is the actuating switch - they seem to be problematic.

The MB locks are either locked or unlocked by either grounding or connecting +12 volts to a "trigger" line. With a short or a malfunctioning switch, the +12 volts (via the C fuse) gets connected to ground when you turn the key, thus blowing the fuse.

To troubleshoot:

1. Disconnect the wiring harness plug to the vacuum controller under the rear seat (slight chance of a cure, but easy to check).

2. If the problem persists, disconnect the actuator switch inside the door.

Hope this helps.