SNKPWR
forum member
First of all, I'm posting in 2005+ tech instead of tunes because my question is more about electrical wiring than the stereo system.
So I have read many threads (dozens and dozens) on here and other mustang sites and have determined that it is quite easy when swapping a newer GT500 or Boss steering wheel on an 05-09 to make the horn, cruise, and lights to work properly. I also think I have a great handle on making the audio controls work, routing the purple wire from the audio button through a wpt440 connector into and out of the clock spring to a PAC swi-rc, and grounding the green wire.
My question is has anyone come up with a way to make the phone controls of the GT500 wheel work through the PAC? My understanding is that he PAC monitors the resistance on its input wire, which is modified with each different SWC button pushed, so it knows what output to give the aftermarket head unit. If you read through the PAC instructions, you basically use the physical input of each button, in specific order, so the PAC can see which command is associated with each button.
I think the problem lies is that the phone control buttons use common resistances to the music buttons, so you can't just combine the purple and blue wires with the white PAC wire, or the PAC would not know the difference between a phone or music command which share the same resistance, right? I reference this thread showing button resistance values:
http://www.s197forum.com/forum/showthread.php?t=96951
So what I'm thinking is that I could just add a resistor inline with one of the button outputs to the PAC to bump the resistance for that buttons' functions to give different values that the PAC sees. That way each button whether on the phone or music wire would all be providing different resistances to the PAC (as far as it knows), and all is happy. Does that sound feasible?
That is also assuming that the manual button programming with the PAC works the way I think it does, by "learning" the resistance of each button and assigning it to a certain function. Can anyone confirm that this is how it works?
Thanks in advance for any help, and sorry if I rambled, I have done a TON of reading and have not been able to find anyone covering this specific issue on the steering wheel upgrade.
So I have read many threads (dozens and dozens) on here and other mustang sites and have determined that it is quite easy when swapping a newer GT500 or Boss steering wheel on an 05-09 to make the horn, cruise, and lights to work properly. I also think I have a great handle on making the audio controls work, routing the purple wire from the audio button through a wpt440 connector into and out of the clock spring to a PAC swi-rc, and grounding the green wire.
My question is has anyone come up with a way to make the phone controls of the GT500 wheel work through the PAC? My understanding is that he PAC monitors the resistance on its input wire, which is modified with each different SWC button pushed, so it knows what output to give the aftermarket head unit. If you read through the PAC instructions, you basically use the physical input of each button, in specific order, so the PAC can see which command is associated with each button.
I think the problem lies is that the phone control buttons use common resistances to the music buttons, so you can't just combine the purple and blue wires with the white PAC wire, or the PAC would not know the difference between a phone or music command which share the same resistance, right? I reference this thread showing button resistance values:
http://www.s197forum.com/forum/showthread.php?t=96951
So what I'm thinking is that I could just add a resistor inline with one of the button outputs to the PAC to bump the resistance for that buttons' functions to give different values that the PAC sees. That way each button whether on the phone or music wire would all be providing different resistances to the PAC (as far as it knows), and all is happy. Does that sound feasible?
That is also assuming that the manual button programming with the PAC works the way I think it does, by "learning" the resistance of each button and assigning it to a certain function. Can anyone confirm that this is how it works?
Thanks in advance for any help, and sorry if I rambled, I have done a TON of reading and have not been able to find anyone covering this specific issue on the steering wheel upgrade.
Last edited: