Honda Ridgeline has resistive steering wheel remote controls.
It can be connected directly to CarPC JoyCon EX.

Reference this post
http://www.mp3car.com/vbulletin/input-devices/141393-joycon-ridgeline.html

Title : Joycon in a Ridgeline

This is a chart for Honda Ridgeline owners wanting to install a joycon.

Main (20 PIN) radio wiring harness connector. This is the largest connector that plugs into the back of your stock radio head unit. This chart for wires 3 and 11 are correct for 06-08 models. Not sure about the other wires but this is strictly for installing a Joycon.

1 —– Not used
2 YEL/RED ACC (main stereo power supply)
3 GRN/RED Radio remote switch <—–CONNECT POSITIVE WIRE FROM JOYCON
4 GRN/WHT Navigation display (SCTY)RED/WHT Multiplex integrated control unit (MICU) (SCTY)
5 RED/BLU Right rear speaker (+)
6 BRN/WHT Left rear speaker (+)
7 BLU Front passenger door speaker (+) Right tweeter (+)
8 LT GRN Driver’s door speaker (+) Left tweeter (+)
9 RED/BLK Lights-on signal
10 WHT Constant power
11 BRN Radio remote switch ground <—-CONNECT GROUND WIRE FROM JOYCON
12 BLU/RED Navigation unit (RG GND)
13 WHT Navigation unit (RG L+)
14 —– Not used
15 YEL Right rear speaker (-)
16 RED/YEL Left rear speaker (-)
17 RED Front passenger door speaker (-) Right tweeter (-)
18 PUR Driver’s door speaker (-) Left tweeter (-)
19 RED Dash lights brightness controller
20 BLK Ground (G404)