Hopefully posting this in the right place, apologies if I've not.
Bought a 2004/54-plate 3.0 V6 Alphard a fortnight ago and been tinkering with it over the last week. It did have an aftermarket head unit connected up, which I (think I) managed to break while trying to reconnect the ceiling DVD player.
I managed to pick up an original head unit from eBay for £21, which the seller assured was working when they removed it from their car, but I'm struggling to get it working in my Alphard. I plug it in, making sure all the available connections are attached, but I get no display (ignition on and off). Weirdly though, if I press the Open button, the front opens up and I have access to the CD and minidisc drives. I tried holding in the Power button for a few seconds, but no joy.
I checked all the fuses and they seem fine. I found the 12V pin on the connector and put a multimeter on it and got a good signal (over 12V). There also seems to be a good ground connection.
Not sure what else I can check, or if there are known issues transferring a head unit from one Alphard to another? (Security locked or something?)
Any help would be appreciated here, as its driving me bonkers. Cheers!