blowing fuse #c when unlocking door's
Thread Starter
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Joined: Aug 2010
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1990 300e 2.6ltr
blowing fuse #c when unlocking door's
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?.
out of the blue the fues is popping
,anyone have any idears?.
MBWorld Fanatic!
Joined: Nov 2002
Posts: 1,028
Likes: 133
From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
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.
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.
