The "remote on" wire for amp from head unit indicates that it is grounded. Is this normal for this wire when the head unit is OFF? However, its still shows ground when head unit is on. Possible bad head unit? Everything else with the head unit is working, amp will not come on using head remote on, however, it comes on when jumpered. Verified head unit is configured for sub-woofer mode (power on).
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If you have a voltmeter or a 12V trouble light, check to see there is 12V at the remote terminal when everything is on. The remote wire coming out of the head unit cant supply a lot of current (usually around 1/2 amp). even a quick short to ground on the remote wire can render it useless.
The remote wire DOES need to be connected to the head unit. You can see if thats the problem simply by touching the remote wire to the power wire. The unit should come on. The head unit should either have a remote lead, or a power antenna lead, and thats what you need to turn the amp on and off. BE SURE your ground is solid, and its usually best to take that to the battery as well to prevent unwanted engine noise. Hope this helps!
With these units, the internal amplifier is an IC that fails sometimes. It can leave the rest of the unit working ok, bit will have no audio. There may be audio from the line level RCA's but not from the speaker outs. Smell the back of the unit to see if it smells burnt. Most of the time it will, but not always. The IC is usually something like a PAL007a or similar. If you are good at soldering, you can order the part, and change it yourself. If not, you will need to seek a technician to replace the part. You may also try an external amplifier and RCA's instead of fixing the IC.
the speakers hook to speaker wires not to any thing else no power no negative poles do you have a remote shut off switch connected to amp this would be important to cut off amp
when cut off amp if you still here the humming this can be an indicator of low power being produced by alternator alternators produce 14 anything below 12 would mean replacement of alternator
if alternator fine then you need to find new ground for amp and make sure you have a good ground for sterio this can be checked with a test light
to check a ground all you do is hook gator clip to power then touch test light end to ground on radio end light comes on got a good ground (make sure not to touch any other sterio wires just the ground wire while connected to power to check grounds)
if pulsing in test light on the ground means you have a bad ground
just disconnect move to better ground
check the amp ground the same way as decribed above
Very common with pioneers. their is a ground loop fuse-located inside the head unit, that has to be repaired at the factory. Or, the best way-just like you said, is to ground the rca's, solder a thin wire to each rca, easiest and cheapest way. I had it happen to me with a 4800.
If you are saying that you wired the remote to the RCA from the amp outputs then that won't work. A good way to make the amp just turn on is to have NO speakers attached, no input RCA's attached. Just have ground to ground and B+ to 12 (battery). If your then temporarily jump 12volt from the B+ terminal to the remote terminal then the amp should turn on and stay on as long as the jumper is in place. In a normal hookup, the remote 12volts is supplied from the radio (head unit).