hello everybody, mercedes w203

i have a f900bt and i bought all the dash kit and wire harness for my car. i matched up all the wires but the unit will not turn on. i read somewhere about tapping the cigarette light? can anybody help me..please

PM if easier, and i apologize if this is in the wrong section

do you have voltage at both the yellow and red (while the key is turned on) wires, do you have a good ground? if so then there must be a problem with your avic

nvm, i got it, i had to tap into the cigerate lighter for the ACC