Stereo upgrade B4 Liberty

[B4_sonic]

I'm in progress of installing a new head unit and I've noticed I have 1 plug I don't know what it is and what it does. It's on the drivers side of the stereo and it's not the antenna. I have no clue what it is. Also I had a test and I noticed I have only 1 speaker working. What's the cause of it. I used ISO harness no cutting of wires. And I've also noticed it sits back too much when it's all back together any help will be greatful

[seanmau5]

Got a picture of the plug?

It's more than likely that the speakers are blown.

'It sits back' as in the whole head unit? If so, take it back out of the car, move the mounting brackets back and put it back in.

[B4_sonic]

Well it was the amp plug. The amp needed to be wired into the new headunit. So what needed to happen was wire it to the speaker output of the headunit and only just the ISO plug for the power to the headunit. So now it's been done I have all speakers working. Speakers weren't blown but I'm putting in new speakers in, in the next few days. The whole headunit sat back too far but I've moved the brackets and now it sits perfect. But I didn't use the supplied harness that came with the new headunit and now I can't watch DVDs need to bypass it somehow.

First photo attached was of the plugs. I know the 2 plugs together are antenna but it was the plug at the bottom by itself was the one I didn't know about but I found out it was the amp plug