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So pink on GM side to blue on stereo side?

That grey wire 4th from left is going to Orange/White to the Metra plug, but the other side is not pinned for a wire.

That blue wire, 3rd from left on the Metra plug, is in the same position as the pink wire, 3rd from left on the GM Metra plug. I have the pink wire cut and not connected. The blue wires are also not connected.

No speaker in center console.

So I have premium sound, not Bose.

Is that C1 on the far right? Why can’t they show me based on what pin it’s going to on the plug? Secondarily, which wire goes to the amplifier?

Front row, 4th wire/pin from the left, tell me what that wire goes to and does. I can’t find it in the shop manual and I can’t really tell the color. Tan? Grey?

I have the GM manual and have been using it.

Shown in pic is the back of the transfer case switch which has two plugs. What is the third large unused plug for? I’m putting this POS back together for the day so I can run to the market and do an oil change on it.

So not needed for this Pioneer head unit.

On the bottom of the GM side Metra plug I have a Green and Green/White pair of wires which are not connected. Manual suggests the Dark Green/White is for Transfer case control module with Electric shift. WTF is it doing in a plug for the old stereo? Again a diagram showing wire colors to pin...

GM side Metra plug. L to R 6 wires: Yellow (missing in pic), Orange (missing in pic), Pink, Grey, Violet/White, Black. Yellow is Hot in ACCY and Run. It is connected to Yellow at the Pioneer (P) harness plug which is power regardless of ignition position. Orange is hot at all times. It is...

RPO sticker:

On the plug to the Pioneer head unit, I have three wires not used/connected: Reverse gear input is for a back-up camera, which I do not have installed, nor intend to. System remote control not used. It came with a remote fob, but I have no intention of using it. Mute, I assume is for muting...

No XM satellite. That came into play about 2001. The middle section of my RPO codes have rubbed off the sticker.

Center portion of the RPO code sticker is rubbed off, so I do not have all of the RPO codes. If it were Bose, it would be advertised all over the truck.

No On-Star. No CanBus

2nd paragraph^^^

I don’t know what system it has. It is a 1999, not early to mid-2000s which would make it a GMT-800.

I think I may get a BOGO out of this. I installed a Pioneer AVH-2550NEX head unit. Got everything work except the the speakers, where I only have the front tweeters working. I used a Metra Plug to the Pioneer Head unit plug. They say the wires are color matched, which should make it easy. There...