Cayenne V8 S 2004 Electrical Gremlins

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Wife was out in the 2004 Cayenne V8S yesterday and totally randomly the reverse lights came on, the bonnet open warning came up and the wipers stopped working. Got it home and still the same. I disconnected the battery under the passenger seat, (and broke the plastic seat runner trims).No boot battery in ours,so let it sit with no power for ten minutes and re-connected, still the same ...
Looks like its an OPC thing- sure to be expensive.
Anyone got any bright ideas?
Many thanks in advance.

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Paulog13 said:

I would hazard a guess that the car is on it's original battery and that as it's now losing power, it's throwing up electrical anomalies....

It's certainly the first thing I'd be checking....

Many thanks for the recommendation. Having booked it into Bournemouth Porsche for tomorrow I get home and it's flat. Charged on a big charger for an hour and she starts with no erroneous problems. Drove about 10 miles all OK and definately charging as it's showing about 13 volts. Get home turn engine off and voltage is down to about 11.5. Looking around it's an 019 battery of 96AH, about £130 from Euro Car Parts or Halfords for a Bosch with 5 year guarantee. So plan to postpone booking tomorrow morning and try a fresh battery first, fingers crossed!

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Fitted a new 019 Bosch Calcium battery at £130 seems now to be OK, fingers crossed!

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JW911 said:

Trade it for a Range Rover. Always reliable and no electrical problems whatsoever. At all.

Yes but they don't depreciate quite as "well" as Cayennes, if that's the right expression. Couldn't afford a new shape or Sport for a third car !

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Cayenne gremlin resurfaced. Took it into OPC, they say its wet under the front footwell carpet and that there is wiring loom corrosion. £1,900 labour plus at least £900 in parts plus VAT. And I only took it in for a new key! Gremlin only surfaces about once every three months. So how do I find out if there was a wiring recall as one poster has suggested?

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Told them I will pick it up today and look at the problem myself. Will keep you posted. Is there a body control ecu under the steering column somehwere as it seems that it may be water damaged?

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Pope, you have hit the nail on the head! Removed the A pillar cover and the rear wash pipe had split on the join, pushed it back together and then wrapped insulating tape all over to prevent it happening again.
So got out the body control ECU and sure enough there were five corroded pins that were on the verge of breaking off on the top right multiplug which I would imagine is the switching loom as the pins are tiny. The socket was full of greenish gunge which I cleaned out with contact cleaner. In fact two pins did break off when I removed the 26 way multiplug. A little judicious work with a soldering iron and we seem to be back in business. Saved nearly £4K as per the OPC quote. Will keep you posted.