Can you help me determing the reverse signal [PHOTO]

[Mariusi]

I took a picture of wire diagram of my car stereo I don't know where the reverse signal is can you please help me?

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[subzero 5,000+ posts]

I took a picture of wire diagram of my car stereo I don't know where the reverse signal is can you please help me?

My guess is the line that says "back"

 

[Mariusi]

is there a way to test it with a voltmeter? what should it read?

 

[subzero 5,000+ posts]

you can test it with a volt meter. It shouldn't be energized until the reverse is engaged.