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Thank you, Frank, for your reply. I knew about the stepped resistor setup, but I think the preset switch panel (the clock one) is what "translates" those resistor values into CANBUS (AV COM H/L) signals. Plus, being that the dial rotates, there are encoder signal values (A, B, L/R, etc.) as well. I just need to find a way to determine what those pinout values are for the ribbon cable then I can hopefully figure out my next move.
Regardless, many thanks for your- and iCrap's- work!
Last edited by ILM-NC G37S; 06-07-2022 at 07:25 PM.
This thread reminds me of how much space I need. My friend an I sat on many interior parts for months only to recycle them when no interest found.
This included a Navi button panel
This thread reminds me of how much space I need. My friend an I sat on many interior parts for months only to recycle them when no interest found.
This included a Navi button panel
Yeah I feel that, my house is full of random car parts lol.
Could be worse, in 2018 I threw away what would be big $$$$ today in extra S2000 parts
Yeah I feel that, my house is full of random car parts lol.
Could be worse, in 2018 I threw away what would be big $$$$ today in extra S2000 parts
I did a wire tuck on an AP2 11 years ago. Fun stuff, parts were dime a dozen. Back then folks hated the AP2 over electronic throttle/clutch slave delay and 8k rpm hard tops averaged $1-15k. We had a guy who became an AP top expert from the amount of frustrations shared on s2ki.
On another note, there was a guy 3 years ago who did a VHR on an AP2. Unsure of the latest news from this car.
350whp all motor 3.7 8k rpm would be fantastic in a S2000. You figure between drive train and parts pulled from the S you could come out even in a swap.
After spending 1/2 a day yesterday and 6 hours today, with a magnifying glass and a ohm meter, I can confirm the switches DON'T use a resistor ladder for the buttons.
It uses a (6 x 5) switch matrix, similar to this:
How do I know this?
Well my non-nav dial/switches has 19 LEDs on it and 19 resistors. Generally each LED requires its own resistor.
That means there are no resistors on the board that can be used with the switches.
That means there are only 30 (6 x 5) different combinations to try.
Once we know the column and row, an external switch could be used to bring up the MFD.
I'm talking a break to rest my old eyes, and will try to map out the switch matrix later this afternoon.
My suspicion still is that the AV unit will ignore the button press unless it's somehow spoofed to think it's coming from a GT-R button panel, because it ignores when I send the Function CAN signal from the GT-R data dump. I hope I'm wrong though.
Catching up on two weeks of y'alls good work (seriously)... is there a way to change what the button panel reports itself as? IE, can we make a G37 panel tell the AV unit it's the GT-R panel? Other than the function button, do they have the same general buttons?
And - matrix strobing the button panel - man, there had to be an easier way to engineer that.
Buttons are identical on the two, with the only difference being the missing Function button. Maybe it's possible to reprogram the G panel, but that's something I would have no idea how to do unfortunately.
Better question: how do devices on a CAN bus identify themselves?
Each module (ECU, TCU, BCM, etc) has one or more CAN BUS IDs.
The module will send a specific CAN ID, followed by 1-8 bytes of data.
Since CAN bus is a "broadcast protocol" it is like 5 people in a room, waiting to talk, then shouting out a message one at a time.
The message goes to all modules and they decide if they require data from that module, via the CAN ID. (aka arbitration ID)
Buttons are identical on the two, with the only difference being the missing Function button. Maybe it's possible to reprogram the G panel, but that's something I would have no idea how to do unfortunately.
Oh, i just meant that the cars share the same general buttons with the only missing one from the G being the function button. I don't have a panel in hand so I don't know if the matrix would be the same of course.
06-07-2022, 03:34 PM
