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Old Dec 29th, 2013, 08:05 AM
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Wet electrics problems

Carpets in my 2003 Mini Saloon got wet in local floods. All general lighting (headlamps, indicators etc) and standard installed anti-theft device etc all malfunctioning. All told that this may cause car to be written off. Question- is it practical to strip floor area and install new wiring harness? Owned car since new, full main BMW dealer service record, only 29000 miles recorded. No desire to replace it
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Old Dec 29th, 2013, 09:46 AM
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I would strip out the front seats (disconnect battery due to seat air bag wiring conns under seats) and carpets yourself, not a big job (many posts on here for removing front seats and carpets), beneath the carpet there is very thick (1-2 inches) soundproofing felt which acts like a sponge, remove this and dry it out plus the few wiring connectors you see, unlikely you would need a new wiring harness.

The main thing to dry out (depending on depth of flood) is the BC1 Body Control Module which could also be causing malfunctions. This is situated in the Drivers footwell and there are many posts on drying this out (see below)......if successful you won't have to replace it, it is essential the 4 large connectors plugged into it are dry (especially those low down which may have got wet) to prevent short circuits of signals to various components/modules around the 'bus' wiring network.
More Info Here:
The BC1 (Body Control Unit) - totalMINI Forums - MINI Forum

or Here:
The BC1 (Body Control Unit)

The only reason the car would be written off is because of the time it takes to dry things out and the high hourly labour rates in main dealers, but you have nothing to loose by trying a diy solution first if you wish to keep your car.
I successfully dried out a Renault Clio for a family member over the Xmas break which was in a similar flood and would have been written off.......we borrowed a Vax water vacumn cleaner to remove the worst but with the Mini it is also essential to dry out the water retained in the thick soundproofing felt in the cavities below the carpet.
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Old Dec 30th, 2013, 08:06 AM
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Firstly, many thanks for your helpful reply. The flood water had reached just above the bottom edge of the doors before I moved the car manually to dry ground. When I got into the car the was little evidence of water other than the damp carpet. I guess the soundproofing would have absorbed it all?
Secondly, had to move the car rearwards up a slope which meant the front of the car very briefly dipped into the flood water (just above bumper). I think I should check the oil as there would have been water in the exhaust which may have run forwards (downhill), though is no sign of contamination on the dipstick.
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Old Dec 30th, 2013, 08:37 AM
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It's very unlikely for water to get into the engine from the exhaust. If the engine was running, the exhaust gasses would have blown any water out and anyway the exhaust ports (connecting the exhaust to the engine) are fairly high up.

In any case, if the engine runs, no water has got in. I believe if you try to start an engine with water in the cylinders, it won't turn over, as the water isn't compressible, so the engine will stop with a clunk before it gets started.
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Old Dec 30th, 2013, 07:47 PM
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If flood water is drawn into an engine through a low down air intake it locks solid and is usually a write-off......so your mini should be fine if it runs ok......once you have dried it out inside.

I would make sure the two lower BC1 wiring connectors near the driver floor in footwell are completely dried out and any wiring connectors under the floor soundproofing.
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