Harness Splitter for head unit

[camspeld]

Hey everyone,

I am taking on a new project which is to install an aftermarket head unit into my car whilst keeping the original stock head unit for the climate control settings/clock.
How exactly would i wire the two head units together?

Additional info: Honda accord euro 06- installing double DIN head unit into glove box.

[camspeld]

Bump, does anyone have any idea how to wire it?

[safetycar]

1: Window Antenna Coil Amp.
2: Ign/Switched +12V
3: Steering Wheel Controls +ive.
4: Multiplex Integrated Control Unit
5: RR +ive
6: LR +ive
7: RF +ive
8: LF +ive
9: Illum./Dash Lights
10: +12V
11: Steering Wheel Controls Ground
12: Nav. Unit
13: Nav. Unit
14: Nav. Unit
15: RR -ive
16: LR -ive
17: RF -ive
18: LF -ive
19: Dimmer
20: Ground
http://www.ozhonda.com/forum/showthread.php?83611-Radio-Harness-Pin-Outs