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Author Topic: Chevy Camaro Compatibility  (Read 1390 times)

Pining for the Fjords

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Chevy Camaro Compatibility
« on: October 16, 2013, 01:37:28 PM »
So, as many of you are aware of, the Unika is not compatible with a TON of American cars. I'm just dropping this here in hopes that someone has come up with a hack of some sort to get it to work with the standard Chevy steering wheel controls. The 2010+ cars and trucks have pretty much the same systems it seems like, so once someone figures out something for one, it should work for the others. I'm not that electrical engineeringly inclined to risk it myself.

Any tips or help would be appreciated.

Pining for the Fjords

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Re: Chevy Camaro Compatibility
« Reply #1 on: October 16, 2013, 01:38:15 PM »
On a side note, the Metra universal kit is not compatible with Parrot, and after calling Metra I was told there are no plans to support it at all as of right now. Great....

moogvo

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Re: Chevy Camaro Compatibility
« Reply #2 on: October 18, 2013, 04:48:43 PM »
My Olds uses a resistive ladder setup, but instead of measuring the resistance to ground, it is resistance to positive which won't work with the Unika without a small amount of engineering.

The first thing you are going to have to do is to figure out if it is a resistance ladder (which they all are at some point, but may not be by the time it gets to the control wire in your stereo harness)

If you have a positive resistance ladder at the back of your stereo, you are going to have to use 180 ohms of resistance between V1 and ground to make sure that the input (V1) wire to the Unika never gets more than 5 Volts when you press the buttons.

Having said this, what happened to me was that the buttons worked when the car was running, but when you shut the engine off, the buttons don't work the same. In my case, Volume up became Volume down. This is because there is a drop in voltage when the car is off. I am working on using a DC to DC converter so that I get 12.0Volts to the switches regardless of what the voltage from the battery/alternator is. The will correct the engine-off problem with the buttons.