This was my latest project, and because of the shipping time involved with shipping from Australia this took a couple months.
Quick history lesson on the Pontiac GTO, it wasn't made in the US, or by Pontiac for that matter. The GTO is a Holden Monaro with a new nose, everything else is identical. The Monaro is the coupe version of the Holden Commodore sedan, which is basically the Chevy Impala of Australia. So, they're every where, they have an identical interior as me, and they have a 4 windows! I got my hands on a 4 window switch block which fits perfectly in my GTO.
The first thing I did was isolate the lower 3 switches by taking a dremel and physically cutting the copper on the board. I then rewired it to my liking, allowing me to input the + side of my switches, and then when closed it completes the circuit to ground. RR up is "Mode" for the SR7, LR up is "Mute" for the SR7, so holding both up allows me to enter programming mode. LR down is also "Mute" for the SR7. but this is the remote mute, so I can control the volume with it. The child lock switch controls power to the SR7 and the LIs.
The block still looks stock from every perspective. There are no hoaky wires coming out of it, I was able to use the stock harness already in the car. I got an extra harness from a wrecked GTO, pulled the pins from the harness, and put them into the open spaces in our connector meant for the commodore functions. I have 5 extra functions, and all it required was 5 more wires.
The last modification I did was change the LEDs on the lower windows and child lock switch. I replaced the single OEM green with 2 12v 3mm Red LEDs, which seem to match the green output perfectly. I changed the LED circuit a little too, the red LEDs only come on when the system is on, otherwise just the two green LEDs are lit.
Modified Vs Stock -------- GTO vs Commodore
The switch modified (looks completely stock)