I GOT A AVIC-X920BT INSTALLED IN MY 05 CHEVY TRAILBLAZER

OK HERE'S THE PROBLEM THE AV SOURCES AS WELL AS THE RADIO STATIONS SOMETIMES GO HAY WIRE N START CHANGING ON ITS OWN .

I TOOK IT BACK TO THE SHOP AND THEY CAN'T FIGURE OUT THE PROBLEM EITHER I USED A PAC AUDIO SWI-PS FOR THE STEERING WHEEL CONTROLS

AND OS-2CBOSE FOR THE ONSTAR N BOSE SYSTEM. HAS ANYONE HAD THIS PROBLEM WITH THERE UNIT ?

HAVE THE PAC MODULES LOOKED AT AND WHILE YOUR AT IT, HAVE THAT CAPS LOCK KEY CHECKED. ONCE THE LATTER IS FIXED FEEL FREE TO POST AGAIN.

they looked at the modules n said that they are plugged in correctly. so i dunno what it is

Well either they didn't look very well or you have a defective unit. Have it replaced and see what happens. Nice going on the caps lock BTW.

you think i have a defective Head unit?

Possibly but faulty PAC modules could also be the problem. Follow my advice and see what happens.

i would lean on more of a defective PAC module over a bad headunit, if the wires where not soldered, that could be causing an issue with reading the corect resistance of the factory controls, GM's are pretty consistant with there steering wheel controls working with out a problem.