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I want to recreate this existing ALPS switch board (the board on the left) in Arduino, so I can control the switches (and 3 memory + 1 menu buttons) from my laptop. The ALPS switch board connects to a controller board (PSM) with relays, microprocessor, and DC motors connected to it. ALPS Switch Board + PSM

The idea is to use Arduino to completely replace the ALPS switch board, while still preserving the controller board connection and current wiring and connector (16 pins + 2 empty pins).

Is there a way I can just connect the 16-pin connector directly to header pins on a certain Arduino variant? And program the individual pins, to replicate the manual switch input + 4 buttons?

Pin diagram See pin diagram attached (seen from the other end of the wiring, on the controller board side), where I get a little bit confused about terminal #C4 - #C7.

If easily possible, I want to use the controller board power, not the Arduino power. I’m also not sure about what the 2000 Ohm resistor on the left side does exactly.

Edit 1: Hopefully the new picture above clears things up a bit. The switch board connects to a PSM (Power Seat Module), which controls the DC motors of an early 2000s car power seat (don't think the OEM matters here). I want to control the PSM with my Arduino (so I don't have to use the ALPS board anymore). In other words, I have to replicate all the functionality from the ALPS board with my Arduino.

Edit 2: A picture of underside of Alps board: Underside of Alps board

Edit 3: The P/N for the switch board is: ALPS ANJ971038D RH DR. And for the PSM (which includes the relays): ALPS ANV971018A. There is no public documentation that I found for any of the 2 boards. The pinout diagram above is from the dealership, but I'm not allowed to post further details about it.

Here are the results of what I measured myself using my multimeter. When the switch board is powered from the PSM I measured 4,5V on the + and - of the 4 memory buttons in neutral position. By pressing a memory butting the voltage drops to 0V. The + and - on the white switches measured 11,90V in neutral position. According to the pinout diagram the voltage is supposed to drop to 0V, but this didn't happen when I moved the switch while measuring. I also measured a resistance of 1490 Ohm between pin 2 and 5 of a white switch (so the neutral position), while the switch board was being powered! No resistance when the board is disconnected from the PSM.

I also measured pin #C4 and #C6/7 right from the connector, and I got 0,99V. #C5 and #C6-7 gave me 2,95V. Pin #C4 and #C5 are connected to the resistor (R1).

The switches are all momentary switches.

2 pictures of sketches/measurement results: Pin measurement diagram ALPS board measurement results sketch

  • I think there's not enough information given for anyone to say (unless they happen to have that same board, and can read your mind to discover what you want to do). Please edit your question to include the part number and model number the board is out of. Please edit your question to indicate which switch connects to which pin, which switches are momentary or latching, and draw a picture of before and after – ie, where the switch board is now, with what it connects to, and where you want it after whatever the conversion is. – James Waldby - jwpat7 Apr 5 '17 at 2:50
  • Yes you could do that, if you could find the matching half of the connector. You then run the leads off to your Arduino and write a program to do what you want. How you do it is anyone's guess, but you could do it. – Code Gorilla Apr 5 '17 at 8:27
  • Before we can answer this question we will need a little more information from you. I can see that this board is for an electronic seat adjustment system. Do you want to replace the board in the picture with an Arduino or do you want to keep it and have the board control an Arduino? Also, what car is this board from? – Matt Apr 5 '17 at 9:21
  • @Matt I just edited. Is it more clear for you now? – CocoaNut Apr 5 '17 at 10:40
  • @jwpat7 I just added more details. I think the pin diagram is clear enough on what pin connects to what switch, right? Which switch is doing what is printed on the switch board. All of the switches are in neutral mode as you can see on the picture. If you manually move the switch left or right or up or down, a signal will be send to the PSM and the motors to change the seat position. Let me know if you need further clarification. – CocoaNut Apr 5 '17 at 10:47

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