# 2008 Impala Wiring

**URL:** <https://community.cartalk.com/t/2008-impala-wiring/29681>\
**Category:** Maintenance/Repairs\
**Created:** [April 27, 2009, 2:20am UTC](https://community.cartalk.com/t/2008-impala-wiring/29681 "2009-04-27T02:20:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![fatherthuerauf](https://avatars.discourse-cdn.com/v4/letter/f/8e8cbc/32.png) [@fatherthuerauf](https://community.cartalk.com/u/fatherthuerauf)\
**Post date:** [April 27, 2009, 2:20am UTC](https://community.cartalk.com/t/2008-impala-wiring/29681/1 "2009-04-27T02:20:49Z")

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I have a 2008 Impala with an expired onstar system. I want to convert the onstar button to open/close my garage door. To wire in the remote, I need to locate the onstar computer. I don’t want to tear down the headliner to trace out the wires. Does anybody know where the onstar computer is located on these cars so that I can get to the wiring terminals?

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [April 27, 2009, 3:37am UTC](https://community.cartalk.com/t/2008-impala-wiring/29681/2 "2009-04-27T03:37:06Z")

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How can you force the On-Star transmitter to transmitt a garage door signal if it is not activated? Are you sure all the OnStar computer needs is +12v and a ground and it goes? You would be better off with the GM Home Link garage door opener or a aftermarket door opener.

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**Author:** ![mr\_josh](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mr_josh/32/3008_2.png) [@mr\_josh](https://community.cartalk.com/u/mr_josh)\
**Post date:** [April 27, 2009, 3:45am UTC](https://community.cartalk.com/t/2008-impala-wiring/29681/3 "2009-04-27T03:45:01Z")

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While I agree that the GM-branded garage door opener would be the better solution, I think the poster just wants to know where the OnStar button’s wiring terminates so that they can connect it to a third-party garage door opener.

I’m going to take a wild shot in the dark and say that the button is probably sitting right on a circuit board and would be pretty hard to interface with. I bet if you could weasel your way in to a Chevy dealer and talk to a tech, they could give you an idea.