No output via "remote amp" cable. Cant turn on other amp automatically. Help!

[mc_bob]

Hi,

My head-unit doesnt seem to send the 12V required down the blue/white wire. It should automatically turn my JBL amp on. Up until now I've just had another switch to turn it on now, but I think I should get it sorted properly
Ive checked all my wiring so there must be something to do with the HU.
Its a Pioneer DEH-6500R.

Any help is appreciated
Thanks

 

[mc_bob]

Lol splitz. I checked the output with a voltmeter but there is no output. Should I just leave it as a seperate switch then ?

Have you switched the sub on in the HU's setup menu system?

The subwoofer works fine so I think Ive turned it all on correctly.