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I have done this in every bmw I have owned, its very simple. If I remember correctly usually brown in ground (or brown stripe). If you take in your radar detector to radio shack you can get all the parts you need for about 8 bucks without having to cut up your regular cord. Pick up the correct 2 prog connector for your model radar, the cord, and a inline fuse. Then its just a matter of finding the correct wire up in the map lights/sunroof controls. On my e53 it turns on and off when the car doors are unlocked and locked. It stays on for about 5-10 min when I lock the car and then powers off when the cars AUX power is cut off.
I think there is a e53 write up on the homepage for this, it is very simple to do and should be very close to your e70. the wires you use might be different colors though.
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2002 4.6is Dinan S2
Titanium Silver/Black Alcantara
DINAN
Stage 4 Engine Software
Automatic Transmission Software
High FlowThrottle Body
Free Flow Exhaust
Cold Air Intake System
High Flow Air Mass Meter
OTHER
CCFL Angel Eyes
Stealth XM Radio in ashtray : FM Mod
Pilot H3 Fog Bulbs
Cleared Headlights: Hi/Lo Beams
Hardwired Radar Detector
IN PROGRESS
Powerstop C/D Rotors: (on backorder)
W/EBC Red Stuff (F)
W/Axxis Deluxe (R)
Dice Ipod: Aux Input for XM
THINKING
SMG II
MK4
Bluetooth
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