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Discussion Starter #1
My back up warning "chimes" are not working. Lights go on but as you get closer to object behind you the "beeping" does not alarm.

Also, button on rear lift gate not working.

Any suggestions?
 

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Did you change any DIC settings for the Park Assist - on/off, or chimes on/off ??? Maybe by accident(no pun intended).

Liftgate - interior console switch on or off? Or is the console switch not opening, or is it the exterior touchpad above the license plate that is not operating the liftgate?

If it is the latter, I fear that the touchpad switch need replaced. I have already had to tackle mine. Here's an intense thread on DIY.
http://www.enclaveforum.net/index.php?topic=10566.0;all

Link to the 13.00 part(switch) Item #4
http://www.gmpartsdirect.com/auto-parts/2008/buick/enclave/cxl-trim/3-6l-v6-gas-engine/body-cat/liftgate-scat
 

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My guess is that the switch on the liftgate has shorted. That happened to mine a couple of years ago.
 

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Discussion Starter #5
will look into. now it is intermittent. works/doesnt work. Work about back up "warning sound". Lights work but sound doesnt.
 
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