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front 12 VDC port quit working
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Manitoba MPV
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Joined: 11 Nov 2004
Posts: 719
Location: Winnipeg, MB, CA

PostPosted: Sun Sep 27, 2015 7:16 am    Post subject: front 12 VDC port quit working Reply with quote

A few weeks ago we lent the 5 to Jr & his wife for an epic road trip.

When they returned it, the GPS was completely dead. Eventually I figured out that the DC outlet on the console was dead. The rear DC port was still good, and the GPS came back to life when plugged into it.

My first thought was that this was a blown fuse, likely caused by the young people trying to run a computer off the DC port.

I'd thought the factory service manual was pretty comprehensive, but it doesn't have wiring diagrams. Therefore, I figured I'd have to test the fuses one at a time unless there was one specifically identified as being for the front DC port.

Looked at the massive collection of fuses and relays under the hood, and indeed, none of them jumped out at me as being dedicated to the DC port. I checked them all with a test light, excepting the larger ones with the clear plastic top. They all looked OK, but who knows. Figured I'd have to wait for a wiring book.

Then I tried the owner's manual. Lo and behold, there are additional fuses inside the cabin, behind a triangular access panel on the right-hand end of the dash.

Took the test light to them, and found one blown fuse. It was identified as CIGAR. Aha!

The fuses are very small, and I had none of that form factor at home. Fortunately, Canadian Tire was still open and had blister packs of the correctly-sized mini fuses in the correct amperage (15 A). (The port is rated @ 120 W - nominally 12 V x 10 A, and in reality more like 14 V x 9 A. In any case, if you can draw up to about 80% of the fuse rating steadily, you should be able to run an accessory using up to about 168 W (14 V x 12 A).

So, lots of words just to say if that front DC port quits, check the fuse first!

Manitoba MPV

'82 GLC 1.5 5-speed ('82 - '95); '79 GLC Sport 1.4 5-speed ('87 - '89); '85 626 2.0 5-speed ('97 - '05); '90 MPV 2WD 2.6 5-speed ('96 - '01); '95 Bawngo GL Super 9 pass 2.0 5-speed ('03 - '04); '97 AllSport 2WD 3.0 auto ('01 - ?); '01 Protege 1.6 5-speed ('05 - '13); '09 Mazda 5 GT 5-speed ('13 - ?)
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