toyota 4 runner and scion wiring

I recently purchases an oem premium alpine unit out of a 2010 scion. I am putting it into my 08 4runner. The plugs are the same but from what I read the c27 connector for aux and steering wheel controls have slightly different pins. Does anyone have reference for both connectors. My steewing wheel controls work but the aux jack only plays thought half the speakers.

Do you have or have access to a digital multimeter? I can probably help you to figure it out. How many pins are on the plug in question?

I do but not too familiar with that to check. There are 20 pins. I think only 9 in use. I was told I need to swap the ground pin from spot 14 to 18 but it didn't change anything. Those directions were from 10 to 08 scion. I figure the toyota may be different.

I do have a multimeter. How should I go about find this. As stated the plug has 20 spots, 2 rows however there are only 9 wires I believe.

Does anybody have the wiring for the non jbl system. There is nothing on here for an 08.

This is from a 2010 tC

Radio 12V	blue	+	radio, white 10 pin plug, pin 4
Radio Ground	brown	-	radio, white 10 pin plug, pin 7
Radio Ignition	gray	+	radio, white 10 pin plug, pin 3
Radio Illumination	green (parking lights); white (dimmer)	+,-	radio, white 10 pin plug, pin 10; white 6 pin plug, pin 5
Factory Amp Turn-on	white (subwoofer amp)	+	radio, white 10 pin plug, pin 9
Power Antenna	orange	+	radio, white 10 pin plug, pin 8
Left Front Speaker (+/-)	pink - purple	+,-	radio, white 10 pin plug, pins 2 and 6
Right Front Speaker (+/-)	lt. green - blue	+,-	radio, white 10 pin plug, pins 1 and 5
Left Rear Speaker (+/-)	brown - yellow	+,-	radio, white 6 pin plug, pins 2 and 6
Right Rear Speaker (+/-)	red - white	+,-	radio, white 6 pin plug, pins 1 and 3
Center Channel (+/-)	N/A
Subwoofer (+/-)	paralleled with front speakers
Aux. Audio Input Left (+/-)	black - yellow (common)	+,-	radio, white 20 pin plug, pins 17 and 16
Aux. Audio Input Right (+/-)	blue - yellow (common)	+,-	radio, white 20 pin plug, pins 15 and 16

Mike M2

Tech Manager

CS Dealer Services