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Steering Wheel Control aftermarket head unit

8330 Views 7 Replies 4 Participants Last post by  mikeell1, 
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This is my new head unit. Binize 7 inch Touchscreen Apple... https://www.amazon.com/dp/B088FM8SGF?ref=ppx_pop_mob_ap_share

The manufacturer says it is compatible with analog OEM steering wheel controls.
It has one brown “Key” wire for the SWC.

However, my ‘05 RAV4 has 3 wires for SWC on the third harness.
1. What do those 3 wires correspond to? Blue, Yellow, and Green.
Wiring chart or list would be greatly appreciated :)
2. Can I connect my unit’s “Key” wire to maintain SWC without an interface as the unit claims?

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K
The SWC wiring diagram is shown below. The 3-wire setup is a resistor network that the OEM radio will recognize depending on which button is pressed. For your Binize headunit, I would connect the yellow wire with the ground wire in the harness, and you can try either the blue or light green wire to the "Key" wire to see if it works.
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KTL said:
The SWC wiring diagram is shown below. The 3-wire setup is a resistor network that the OEM radio will recognize depending on which button is pressed. For your Binize headunit, I would connect the yellow wire with the ground wire in the harness, and you can try either the blue or light green wire to the "Key" wire to see if it works.
View attachment 165744
Click to expand...

Thanks!
This worked perfectly except one detail.. I had nowhere to connect the blue Key2 wire so the 5th OEM “Mode” button doesn’t relay any signal to the unit.
Can I twist Key1 & 2 together or is that a bad idea?
My speakers now crackle when I turn on the car after installing my new head unit :/ (all my connections are soldered/shrink-tubed, and secure)
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K
Looking at the circuit again it seems like the light green (SW1) and blue (SW2) wires are tied near the buttons, seemingly the same function, but it's unlikely. Is there a way you can check the voltage levels on those wires when the particular button is pressed? You may need to use the stock headunit to see the proper values. Otherwise, I don't know what will happen if you tie the blue wire together.

As for the crackle sounds, are they always heard, or only just starting up the vehicle?

Sent from my moto g(6) plus using Tapatalk
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KTL said:
Looking at the circuit again it seems like the light green (SW1) and blue (SW2) wires are tied near the buttons, seemingly the same function, but it's unlikely. Is there a way you can check the voltage levels on those wires when the particular button is pressed? You may need to use the stock headunit to see the proper values. Otherwise, I don't know what will happen if you tie the blue wire together.

As for the crackle sounds, are they always heard, or only just starting up the vehicle?

Sent from my moto g(6) plus using Tapatalk
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Looks like I have some homework to do 🤙🏽

The crackle is only upon startup, even if the unit is left off.
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I was looking at the which SWC controller you may need and it seems the PAC SWI-RC-1 would work. I modified the below picture from what the wiring guide says for an Android radio to show the actual factory wire colors.
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Just going to add this for help as I was a bit lost with my new android unit on my 09 Rav4.

The harness that came with the unit plugged into the 2 main plugs, but I had an extra couple plugs off the units loom that did not fit anything else, though it did have 3 pins on one of them. So if you've got a blue plug with an adapter on the end, you can pull the 3 pins out the new units adapter and plug them into the correlating holes where the other wires go into on the backside. Which colour goes where was me matching up the negative black wire first and then following next to that.

After this was working I then taped the pins up so there was no contact between them and secured them to the other oem white adapter that goes onto the blue (or just use the blue one). The purple wire didn't need to do anything. So I tucked that away.

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Tarav4 said:
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Thanks!
This worked perfectly except one detail.. I had nowhere to connect the blue Key2 wire so the 5th OEM “Mode” button doesn’t relay any signal to the unit.
Can I twist Key1 & 2 together or is that a bad idea?
My speakers now crackle when I turn on the car after installing my new head unit :/ (all my connections are soldered/shrink-tubed, and secure)
Click to expand...
@Tarav4 When you connected the green wire, did that activate the up & down buttons as well as the volume buttons, but not the "mode" button (like you already mentioned)?
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