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Old 12-18-2014, 04:21 PM   #1
Registered User
Join Date: Feb 2013
Location: Humboldt County, CA
Posts: 13
My Ride: 2001 325i Sport
Question Cigarette Lighter Troubleshooting with DMM

Hi there,
My 2001 325i cigarette lighter is not functioning. Checked the fuse and fuses around it and they checked out ok. Swapped out the fuse with a new one even though it was not broken. Removed the ashtray unit by removing the shift boot, unscrewing the 2 screws, removed the sunglass pocket and removed 2 upper screws. This is where I decided to use the multimeter to see if there was any juice. Connected 1 point of DMM to the middle then touched the side with the other. POP. There goes the fuse. I removed the wires from the cigarette outlet and tried 1 point of the DMM into the brown wire and the other point into the other wire. POP goes the fuse. Why is this happening? The wires are not touching and are completely separated.

The problem with the cigarette lighter seems to be that its just really dirty and is soaking in some paint thinner then will get a good scrubbing.

I just would like to know why I keep popping a fuse with the digital multi meter.
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Old 12-18-2014, 04:28 PM   #2
Registered User
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 12,665
My Ride: '06 330CiC, '03 M5
Do you know how to use a VOM?

You may have the test leads in the current shunt withing the meter.

Take a picture of your meter with the leads in the position you are using it as well as the way you have the dial selector positioned and post it here.

Best to check with a test light.
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cigarette lighter socket, dmm, fuse 47

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