2002 Trailblazer / GMC Envoy Owners

[hijacker]

Just a note to those who have the Class II RDS w/Bose and 6-disc in-dash radios (model #15058231): Apparently, no one make an AUX-IN kit that works correctly with this particular unit. I talked to an engineer at PAC-AUDIO and at USA-SPEC, they both said the radio has the aux disabled because it uses it for the built in 6-disc.

But there is a work around: The head unit sends its audio to the amps at a constant level, and the amp's volume is digitally controller via the Databus. So you can do this: Wire up a relay switch to toggle between your own input and the radio's output.

24-pin connector:
A9 - Left (-) dk green
A8 - Left (+) tan
B10 - Right (-) org / blk
B11 - Right (+) lt green

You MUST use a ground loop isolator and 2 DPDT relays so that you are completely disconnecting all 4 wires from the head unit and connecting them to your own input.


Radio Left (-) ----------/------- Amp Left (-)
Radio Left (+) ----------|/------ Amp Left (+)
Radio Right (-) ---------||/----- Amp Right (-)
Radio Right (+) ---------|||/---- Amp Right (+)

In L (-) --------|************| --- To Amp L (-)
In L (+) --------|GND Isolator| --- To Amp L (+)
In R (-) --------|************| --- To Amp R (-)
In R (+) --------|************| --- To Amp R (+)


I tried it out and it works great! It's a little tight to splice the factory harness, but it does the trick.

-hj