I have a 2004 Envoy XUV w/ Onstar(not going to use Onstar so no bypass needed) and am trying to install the Pioneer AVIC-D3 unit. So far I can get the unit to turn on and play through all speakers without any problems. I have connected the accessory wire off the pioneer unit to the Midgate fuse in the fuse box as I was told on this forum that works perfectly. As soon as I do this, the unit will turn on without any key in the ignition. I have installed dozen of decks in my time but this is the first one I have attempted where there no accessory wire in the stock harness. Any ideas why the deck stays on all the time?

Also if anyone has installed a GPS unit in the exact model/year, where can I find the Speed Sensor wire? Anyone have pics of the exact wire? Thanks!

Accessory orange + ignition harness

Speed Sense dk. green/white PCM

4.2L: The PCM is attached to the driver side of the engine. VSS is in the blue plug, pin 32.

5.3L: The PCM is near the lower front driver side of the engine. VSS is in the green plug, pin 50.

Can also get vss at the radio harness, same color as posted above.

yes most gm cars accessory isnt on the stock radio harness i have a cobalt with out the on star same way its in teh ignnition harness under the steering wheel