Aftermarket Head Unit Key(+) wire?

[DentMan06]

Hello, everyone!

I've got a 2015 Chevy Sonic Hatchback with the 6-speaker setup. Today, I replaced all of my speakers and my head unit. The head unit I went with was the ATOTO A6 Pro (https://www.amazon.com/ATOTO-A6Y272...to+a6+pro&qid=1561862778&s=electronics&sr=1-1). I went with this unit because I wanted as close to a full Android experience without breaking the bank. So far, I love it.

That said, I have a single issue: I did not purchase the Metra ASWC-1 harness that will retain stock steering wheel controls. Before shelling out the cash, I e-mailed ATOTO support and they got back to be quickly with the following message:

"I checked and found that your car uses analog resistive based signal to control dashboard stereo, so you don 't need any other module (ASWC-1 interface is never required!).
May I know how many wires that you found are relative to the steering wheel controls? Please connect the positive wire(s) to the Key(+) / Key#(+) wire, connect the ground wire to the ground wire of ATOTO A6."

That being said, I have some questions:
1) WTF is "analog resistive based signal"? Google didn't help with that one.
2) I have the Key(+) and Key#(+) wires coming off the back of the aftermarket head unit. That said, it sounds like there ought to be a couple of wires coming from the steering wheel for the stock controls that I will have to connect to the Key wires. Any idea where I can find these?

If I can save $50 and avoid the ASWC-1 adapter, that would be nice!

 

[skurtov]

Hello, everyone!

I've got a 2015 Chevy Sonic Hatchback with the 6-speaker setup. Today, I replaced all of my speakers and my head unit. The head unit I went with was the ATOTO A6 Pro (https://www.amazon.com/ATOTO-A6Y272...to+a6+pro&qid=1561862778&s=electronics&sr=1-1). I went with this unit because I wanted as close to a full Android experience without breaking the bank. So far, I love it.

That said, I have a single issue: I did not purchase the Metra ASWC-1 harness that will retain stock steering wheel controls. Before shelling out the cash, I e-mailed ATOTO support and they got back to be quickly with the following message:

"I checked and found that your car uses analog resistive based signal to control dashboard stereo, so you don 't need any other module (ASWC-1 interface is never required!).
May I know how many wires that you found are relative to the steering wheel controls? Please connect the positive wire(s) to the Key(+) / Key#(+) wire, connect the ground wire to the ground wire of ATOTO A6."

That being said, I have some questions:
1) WTF is "analog resistive based signal"? Google didn't help with that one.
2) I have the Key(+) and Key#(+) wires coming off the back of the aftermarket head unit. That said, it sounds like there ought to be a couple of wires coming from the steering wheel for the stock controls that I will have to connect to the Key wires. Any idea where I can find these?

If I can save $50 and avoid the ASWC-1 adapter, that would be nice!

GM does not have formal control wires from the steering wheel. It's all handled via data transmission through CANBUS

 

[ScarabEpic22]

Yea GM has pretty much put all the controls via CAN for years now. They were VPW based before CAN in 06 since 96. You wont find dedicated button wire(s) as they simply arent there.

You might be able to get around it, but you'd have to run wires through the column to each button, open the button case up and solder new wires directly to the switch PCBs. I'm all about being cost effective, the ASWC-1 is pretty cheap at ~$50 to just hook up a few wires and not worry about it IMHO.