I understand about the switch on the dash--I have to leave it in the always off position or the rear lights will stay lit all the time. I am wondering why in the 'auto' position they stay on with all doors closed.

Everything in the rear gate looks brand new (I have had the panel off) but I will open the rubber gaiter and see if harness is OK. Keep in mind all electrics in the rear gate (hi center brake, plate lights, rear wiper, rear defrost, and alarm on / off work fine. Also, If I use one of the front door locks the rear lock operates normally. It is only if I use the key in the rear lock to lock or unlock then the rest of the doors don't work.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro