onstar audio

 which pins on the 1858 does the onstar audio come in on?  I have a 2002 buick rendezvous and would like to feed it through my aux on the headunit....thanks

I believe the onstar has it's own harness on the back of the factory radio. I know metra makes a harness that allows you to run onstar audio through a pair of rca's to an aux in on an aftermarket HU.

oh and an 02 rendezvous won't use the 1858, it's a classII data radio, use 70-2003, or use the GMOS-01, that will retain the onstar and chimes.

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

if it's a bose system(which I think rds systems are) you can use the GMOS-04, which provides low level inputs for the factory amplifier as well as retaining all the factory features


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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

what i did was i used a metra 70-2003t harness to relocate the factory headunit to the back, i also plan on extending the  onstar plug to the back also but how can i get onstar audio with this setup?

oh; you've already got the t-harness, there should have been a separate plug on the back of the factory radio, that's the onstar audio plug. It's a single row, 5 or 6 pins i think. There is a metra harness that allows you to do exactly what you are trying to do, but I cannot remember the specific model number. you could try Metra. You should be able to get the specific model.

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

hey; I just found it, it's 70-2006

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

ok, so let me get this right....i've got the factory radio relocated to the back with the t-harness, i get the 70-2006 and plug it into the 3-wire factory onstar plug and use the aux-in on the headunit...am i right so far?

you got it; then when you need to use the onstar, just switch your headunit to aux, and away you go

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

just one more question....with this setup (t-harness) i don't know where to get a 12v constant from, there isn't one on the harness itself (just ground and accessory)...do you have any ideas where i can get it?

you should have a ground and constant in the harness, there is no switched acc wire in the factory harness. You can grab the orange wire at the ign harness for acc power.

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

ok i looked at the factory harness and there aren't any red wires indicating constant 12v, there are a couple of orange wires and a few other colors...on the t-harness there is a black ground wire, yellow accessory wire, and other wires for front and back audio....does anyone know where i can tap a 12v constant at on this vehicle and what color it would be?? Also, i don't think the onstar aux harness would work for me because as of right now the onstar doesn't have any power without being the small plug being connected to the factory radio so I don't know how to power it up without this connection...anyone have any ideas? thanks

yellow is constant, red is switched. You've got em backwards, just run the red to the orange wire in the ign harness.

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

Run the red to the dark brown in the ignition harness. This is actually the accessory wire off the ignition switch.

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sparky

sorry to sound stupid but is the ignition harness the factory harness that plugs into the radio?