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Working components :
Power
Speakers
Park brake switch
Reverse Sense
Paritally working :
Steering Control
Not working :
Rear Camera
The steering wheel controls can be seen to operation :
When the old head unit was plugged in the voltage varied depending on the button.
When not plugged in I get a varying resistance between the signal wire (Pink pin 5) and what I
gather is remote ground (White pin 20)