I have recently brougt this second hand ,power is at the plug on the back of unit but nothing works.
I have checked the fuse on the back and have pressed the re set button on the front but still nothing please help.
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Make sure the antennae input is plugged into the back of the head unit. There should be a lead behind the dash coming from the car for the antennae. This will plug straight into the back of the head unit to receive radio signals.
Hi. On the back of the ISO lead switch the red and the yellow. The VW constant positive (station memory) comes off a different pin to other cars. Therefore when you are switching your engine off you are switching the memory power.
If you've got 12v constant on the yellow, 12v switched on the red, and chassis ground to black, your fuses are good the radio is powered properly.
When you plug the harness into the back of the radio you should hear the CD transport cycle. That's telling you the radio's getting power. Hit the reset button (pin-hole switch on front panel) and hold the small square open/close button for 2-3 seconds.
If still nothing, the radio needs service. I'd send that model to Alpine in CA for repair.
Its probably your wiring harness that came with the stereo. Which can cause many more problems. alpine changed their wiring harness around that time. But they used the same plug, just wired different. So now there are crossed wires, but the plug fits, causing the amp chip to fry. maybe even further than the amp chip. an amp chip replacement runs about 80$ at a repair shop. if its just that.