Key1 Key2 GND Steering wheel – What Are Key1 Key2 Wires

  1. Our Unit have 3 cables for the steering wheel function (GND cable, Key 1 and Key 2 cable)

a- GND cable connects to negative

b- Key 1 and Key 2 cable connect to the vehicle to get the function for the buttons on the steering wheel

2) First, Uninstall the original head unit from the vehicle

3) Unplug all the cables

4) connect the cables for the speakers, power and radio antenna.)

5) The rest of the cables are for the steering wheel control function. GND Key1, Key2

Basically, the head unit produces 5V from Key 1 or 2 then when grounding it makes the loop so that when you press a button on your steering wheel, then the head unit detects the appropriate voltage drop and reacts to that.

How to find out the steering wheel control function on the vehicles

Use the multimeter, to touch any 2 of the cables, then press any button on the steering wheel. Until the beep sound is “On” on the multimeter , then that means those 2 cables are for the steering wheel control, if no beep sound when try the first 2 cables, then try the rest of the two cables until got the beep sounds.

Once found the cables (2 or 3) on different vehicles.

Then just connect those cables from the vehicles to the key 1 and key 2 cable on our unit, then go to the steering wheel setup page on our unit, and set the function for all the buttons on the steering wheel controls to our unit


Our unit is only compatible to the analogue steering wheel control. If you have digital steering wheel control you may need to use an adapter.

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