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Originally Posted by f5fstop
Wondering do you have an early build H3? Reason I'm asking is I'm trying to correlate some information on why some have the VSS wire to the connector and some don't. In addition, you say three purple wires, per the schematics, one of those three purple wires going to the radio is only for the GPS head unit. So, I'm only guessing here, but from what I seem to have found out, early builds have the plugs setup for the NAV system, even if they had no NAV system. Somewhere along the line, GM revised the wiring and the NAV wires were left out unless NAV was installed in the plant.
Now, back to those three purple wires. You say you have to splice them together? Doesn't the new system adjust volume for speed? The purple wires are the serial data bus wire, that the BCM uses for multiple reason. One, to signal the volume to go down or up depending on speed, to identify the radio that is part of the internal LAN system, and to chime and I believe the RAP circuit. So, the twisting of these wires together confuses me, since the information on the website regarding these adapters state the RAP circuit works, the volume is controlled.
Are there wires that need to be spliced into other circuits other than the radio circuits?
There is a small shelf just above the radio, where the factory NAV system antenna is mounted, and that should be okay for the Pioneer, at least that is where I'll mount the antenna.
Where did you install the XM box? Did you mount behind the radio, or over the glove box?
Sorry for all the questions, but those purple wires confuse me, but then again, I do not have the wiring schematics for the adapters.
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I purchased my H3 on Oct. 15, 2005. Not sure of the build date. Mine seems to have all of the wires there. There is a bulletin for the GMAH24B that states that the 3 purple wires have to be connected together with a jumper wire. If not, the GMAH24B may not work for OnStar and possibly the new stereo will not power up. Sorry, I don't have any other reason why.
The online instructions for the GMAH24B are horrible. It is for an old version. There is no longer a resistor wire kit. Also, the Monsoon system is not considered to be the Premium Bose system. Just connect all of the wires to the new stereo harness per the wire colors. They all match. I just connected them all so I am running the front and rear speakers through the adapter. I have have full balance and fader controls. All of the chimes are controlled through the GMAHCM adapter. I also have RAP for the new stereo. I don't believe that I have speed sensitive volume (I haven't paid attention). I assumed that was controlled through the factory stereo since you could change it or turn it off using the factory stereo controls, but you are the expert there. If it is in the BCM, then maybe it will retain the last setting when the factory stereo was removed. I never had mine turned on so I don't think I have it.
I actually slid the XM module right in front of the OnStar module. It is between the OnStar module and the front of the center console. There is a metal bracket that the OnStar module sits down into. The bracket just needs to be bent slightly towards the Onstar module for the XM module to fit. I can try to get a picture of it tonight or tomorrow.