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Discussion Starter · #1 ·
2007.

Which wire under the dash is for the high beams? I'm setting up lights that I want to have come on with the high beams, and I want a wire to use to trigger the relay.

Thanks!
 

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Looking at the schematic for the combo switch it's a mess - it appears to be digital sending pulses of a certain duration to the BCM which are then converted to voltages which feed the IPDM (intellegent power distribution module) under the hood. THe IPDM outputs 55 and 56 are from the highbeam relays and are color coded G (green) and L (Blue).

(see pages LT-53 and LT-8)
 

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Discussion Starter · #3 ·
It took a lot of time and a digital oscilliscope, but I found that out the hard way. I just ran them from the wires you speak of under the hood.

What book are you looking at. I'd love to get one.
 
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