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Old 01-11-2012, 07:47 AM
stuartjohn24 stuartjohn24 is offline
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Location: Chippenham, Wiltshire, UK
 
Join Date: Jun 2011
Posts: 664
Mein Auto: BMW E65 745i
This is the schematic for the circuit that switches the tuner on and off.



It is connected to terminal 30 via a fuse, and the switch input is connected to the power module. The ACC is switched to 12V when the key is in the ignition.

Q2 is a P-Channel MOSFET, it can be anything with a capacity of 10 or so amps, a low on resistance is ideal. Q1 can be any small signal N-Channel MOSFET few hundred mA at most.
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