damaged wiring or extra wiring that looks out of place, as in someone had previously installed something like an aftermarket alarm, or stereo and did a shoddy splicing job. all the factory wiring will be in nice neat bundles with the awesome black felt tape and carefully secured by nice clips and routed deliberately. Shouldn't be any wires or bundles hanging loosely anywhere, or using zip ties for bundling. Damaged wiring should be obvious because either melted plastic or frayed/cut wire bundles should be fairly easy to spot.

And one more clarification, the NAV/Radio screen doesn't turn on, do you still get sound, or it is totally inoperable?

Will the radio work if the key is just turned to the Accessory position?

If the ignition switch has a bad contact, turning the lights on could allow the light control circuit to backfeed the other items on the ignition switch that share a common contact point.

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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i