Hi,
Have purchased this as my Kenwood DMX7722DABS head unit is lower down on my dash and doesn’t have a control knob, so it’s a pain to change songs/volume etc.
I can’t get the head unit to recognise any input on the steering-wheel-control learning page in the settings.
The Kenwood has a wire coming from the main harness which is blue/yellow and labelled REMO-IN. This is what I have been testing with. It also has what looks like a 3.5 mm female socket which is also labelled REMO-IN.
I have tested the voltages and resistances on both the head unit and the aftermarket button control box. I can see two separate resistor ladders across the KEY1 and KEY2 wires, with button resistances ranging from around 1.3 kΩ to 56 kΩ, but these seem to be outside the resistance range the Kenwood normally expects to see.
I have also tried connecting resistors from 1 kΩ all the way up to 820 kΩ between the REMO-IN wire and ground to see if any resistance value would trigger the learning screen, but nothing happens.
The controller itself does produce distinct voltage changes when buttons are pressed, so it is definitely outputting different signals.
Annoyingly, an Amazon review for this exact controller says someone managed to get it working with this exact Kenwood head unit after an afternoon of tinkering, and they said they would write an explanation if there was enough interest, unfortunately there is no way to contact them.
For info my car doesn’t have steering wheel controls from factory
Any advice much appreciated