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This generation of Vibe may have the upgraded audio system installed from the factory. In order to get the audio from an aftermarket radio to play through the factory amp, the factory remote turn-on lead must be located. If you are using an adapter harness, it may have the wire installed, just attach the blue/white stripe wire from the Alpine to the blue or blue/white stripe wire on the aftermarket harness adapter.
ok when you look at the front of your system there is a button that has a (F) on it press and hold tell stuff comes on the screen then just keep pressing it tell you get to AUX off you should get it from there hope this helps
The Alpine has two tigger wires when it turns on. One is an AMP TURN ON wire (blue/white) and a PWR ANT wire (blue) and that wire only comes on when using the radio or an optional HD radio unit ... When it was installed/connected . someone hooked your amp turn on wires for your "full range amps" to the PWR ANT wire. And the sub amp trigger is either hooked correctly to the AMP TURN ON WIRE or somewhere else, it probably shouldn't be... Check it. Amp triggers should all be to the blue/white wire from your alpine. Warning: Alpine trigger wires, are very easy to mess up they supply a very limited amount of power.
Certainly, the output IC might need to be replaced, also check to see if there is a factory amp somewhere in the car.
Additionally, double-checking the wiring is a must.
How long does it take for the unit to heat up?