I asked this question about four months ago and didn't get a single idea. So... maybe there are some fresh minds out here that might be able to help with my problem.

AVIC-Z3 installed in new car equiped with OnStar in July, anytime I use the OnStar service, including the OnStar mobile phone, the AVIC completely powers off. As soon as the OnStar is done, the AVIC powers on automatically. Not a terrible thing, but very annoying if I'm trying to use the navigation while talking on/with OnStar.

Any thoughts?

thanks

'c'

I don't know much about wiring in cars or anything so this is just a brainstormed idea:

I wonder if maybe your OnStar system and your AVIC are spliced into the same 12v line, and when the OnStar turns on it sucks all the power away from your AVIC system.

If I'm a retard someone please tell me and I'll shut up.

Mine doe's the same .. I have a 2007 Impala

Did you get the right onstar adaptor for your specific vehicle when it was installed?

GM LAN ,I'll have to find the number..

check to see that whoever installed your unit with the gm Lan adaptor (probably a GM -oso1 or oso4) used a relay on the switched output.

the lan adaptor might need a relay to be triggered, instead of connecting to the 12 ign wire.

im am more willing to bet that they wrong adaptor is being used. and its NOT the onstar adaptor.

The adaptor shoudl interrupt FRONT SPEAKERS only when onstar is activated. The problem you are describing is that whoever installed it is interrupting power to the radio.

The only logical explanation for this is, that the shop/installer didn thave to correct adaptor, and somehow needed to stop the radio from comming out the speaker at the same time as the onstar. so instead of using the correct adaptor, they used a relay to shut off the radio only when onstar is active.

OR

you have a bose system, and you cant actually turn off the factory amp when onstar is active because then you wont hear the onstar, so they just shut off the radio.

in either case, it seems like the wrong Lan adaptor was used. There are 7-10 different GM lan systems and adaptor.

go so Metra's website and see which is the correct for your vehicle.

you will need to know the following

Year

Make Model

Onstar (yes or no)

Bose (yes or no)

RSE (rear seat entertainment) (yes or no)

Factory nav (yes or no)

good luck

Wolfz23

im having a similiar problem with my z2 - its in a 09 trailblazer SS with the correct adapter and when i hit the phone button the sounds goes away but the unit doesnt shut off like the OP.