E46 window switches with one touch function

[ajune]

Physical switches completely desoldered from the PCB to facilitate true view of tracer routes.

[ajune]

But I need some assistance and guidance on designing such a circuit

[ajune]

Thankfully mine is a coupe, I'm curious how to build a circuit that creates that function though.
For my project I want to design my own circuit to create the one touch feature using PCB and resistors and most likely an over current protection circuit on the board to stop the windows when the motor begins to draw more than typical current resetting the relays in the circuit due to reaching top, bottom, or encountering an obstacle that puts more than normal operating resistance on the motors and causing them to draw more voltage like a hand.

[StereoInstaller1]

Nice work so far...and just so you know, every 'vert owner needs that feature where the windows drop an inch when the door opens then closes back up after it shuts...

[ajune]

Okay time for the breakdown of photographs and what I've done so far with the switch.

Switches unmolested.



Half open but still unmolested



Fully disassembled (but still unmolested)



Pin out on bottom of switch, female end for harness on the actual switch itself.



Bottom side of unmolested PCB showing tracer routing



Top side of PCB showing top tracer routing



Another view of topside showing easier view of pins



Top side of PCB with rear up activation switch desoldered showing tracer routing hidden underneath the switch.



Bottom side of PCB desoldered



I'm in the process of drawing a full physical diagram of the circuit board that isn't displaying CAN-BUS style signalling, but rather actual current flow. As soon as I'm finished drawing it up I will be posing it as well as a secondary diagram with what gets nodded where and how to give traditional output signal.

[ajune]

Here is the diagram for the GM5 and the window switch. Position 0 corresponds to no signal on any of the activation pins (2 & 3; 4 & 5)

[ajune]

I'm going to retrofit my E30 using E46 window switches, and add motors to the popouts so that using them is more convenient. So far I have matted which pins on the switch activate in what order and for each function. They are the two window switches that have only six pins designed for use with a GM5 system. Considering how much of a complete nightmare instllig a GM5 into a pre-OBD vehicle would be, I'm opting to instead figure out how to get the switches to function in an E30 using alternatives to a GM5, up to and including pulling out some PCB and building a micro module to control just the windows.

Here's what I've got on the switch so far:

Pin 1 is common switch negative terminal
Pin 6 is the polarized illumination positive terminal (LED)

Functions:
-Front Push: half activates pin 3; full then activates pin 2 as well, providing the momentary signal to trip auto open after the GM5 has seen pin 3 activated first, which on its own signals open window.

-Front Pull: half activates pin 2; full then activates pin 3 as well, providing momentary signal to trip auto close after the GM5 has seen pin 2 activated first, which on its own signals close window.

Rear Push: same principle as front push using pin 5 to signal down, and then 4 follows with full push to activate auto open.

Rear Pull: same principle as front pull using pin 4 to signal up, and then 5 follows with full pull to activate auto open.

Next I will need to further study a relay setup to actuate auto open/close feature and any module diagrams to build and incorporate a simplified CAN-BUS style module to the GM5 that is strictly for window control that can interpret the signals sent and what each activation order means rather than being required to swap over an entire E46 CAN-BUS system.