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post #1 of 6 (permalink) Old 10-16-2015, 01:53 PM Thread Starter
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Switched 12v Source in ACC Position

As the title says, I need to find an ACC position power source for an aftermarket radio. It seems the one who installed it, ghetto rigged the airbag status circuit but that is only live in the RUN position. I tried using the wiper circuit as was suggested on some forums but that too is RUN only.

Others suggest the sunroof circuit but I`m unsure my LS has a fuse position available (no sunroof) and the car is far away at the moment so I cant check it out. What other options do I have?
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post #2 of 6 (permalink) Old 10-17-2015, 04:50 PM Thread Starter
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Here`s an update, I tried the sunroof allocated spot in the fuse box and it will not accept a fuse. Back to square one and out of options. I cant believe no one else ever experienced this.
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post #3 of 6 (permalink) Old 10-17-2015, 07:29 PM
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The big pink with black stripe wire on BCM "C3" pin "D7" is accessory voltage.


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post #4 of 6 (permalink) Old 10-17-2015, 09:14 PM Thread Starter
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Thank you Coby. Is there ample current available from that wire to run the radio or should it only be used as a trigger voltage?
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post #5 of 6 (permalink) Old 10-18-2015, 02:58 AM
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There's also B5 accessory voltage.

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post #6 of 6 (permalink) Old 10-26-2015, 07:25 PM Thread Starter
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Follow up

D7 didn't work out but B5 did. The 2 brown wires going to that pin location do indeed go hot in the ACC position however, judging by the wire gauge, I was doubtful about the current capability of that circuit.

Just to be safe, instead of powering the radio off that I inline tapped both those 2 brown wires and used it to trigger a 12vdc, 30 amp SPDT relay and used the wiper circuit for the actual, discreetly fused power. The relay coil only draws < 80ma so the B5 circuit should essentially be un affected.
All is now good , thanks again Coby.

BTW, where does the other end of B5 go?
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