head unit wiring question

[david harvey]

I have recently bought a Sony cdx-m9900. the auxiliary input does not
display video on the screen unless you connect a light green wire to the
handbrake switch wire for safety reasons. if I wanted to bypass this(eg for
reversing camera) what should I connect this wire to? constant 12 volt
supply?

[mayhemkrew]

Almost all units need a ground for the monitor to work. So ground that
wire, if that's what yours needs, and you are all good.

"david harvey" > wrote in message
...
> I have recently bought a Sony cdx-m9900. the auxiliary input does not
> display video on the screen unless you connect a light green wire to the
> handbrake switch wire for safety reasons. if I wanted to bypass this(eg
for
> reversing camera) what should I connect this wire to? constant 12 volt
> supply?
>
>