Head unit fitted but no sound. supplied harness connects into car iso plugs. HU powers up and displays track playing but I have no sound.
car has Hi-line HK with amp and sub.
question1. do i need to connect the new HU blue/white wire (remote on) to pin5 of grey iso to wake up the OEM amp.
question2. will the speaker outs from the HU be compatible with the amp; not sure if amp input are high or low level.

hope this make sense!

any help ould be great.