Aftermarket radio problem
Are you still using the Monsoon amp or have you installed an aftermarket one? The Monsoon amp doesn't have a turn-on signal wire - it has constant power and turns on/off based on detecting audio signal input from the head unit. On the other hand, most aftermarket amps have a separate turn-on wire that powers up the amp whenever 12v power is applied on that wire.
So, if you still have the Monsoon amp and it is staying on then either it's seeing some audio signal from your HU or it's defective. If you have an aftermarket amp and it's staying on then it must be getting power on its turn-on wire all the time. Your Pioneer HU has a turn-on output (blue/white wire) that should be the only thing connected to the amp's turn-on wire. If it is connected that way then either your HU isn't turning off when it should or it's defective.
The raining thing concerns me... there should be no difference in what the audio system does regardless of rain. First because the wiring is all inside the car and second because even if it was outside it is all properly sealed from moisture (all your connections are tight and secure, aren't they?)
I would say it's a fair guess to figure the problem is somewhere related to the aftermarket HU installation since that's when the problem started. Do you still have the factory HU that you could plug in to check if the problem goes away?
From harness adapter I have two wires left (blue and orange) from aftermarket HU I have 4 wires left (blue/white, purple/white, orange/white and yellow black) number of connected wires are only 11. (Yellow, red, black, green, white, gray, purple, gray/black, green/black, white/black and purple/black. Do you see any flaw?
Plugged in old radio, works fine no problems.
Last edited by BamaBird22; May 3, 2016 at 05:45 PM.
This shouldn't happen when using an adapter harness but it never hurts to double check. Make sure that the red wire from the HU harness goes through the adapter harness and connects to the yellow wire in the factory wiring. Then make sure the yellow wire in the HU harness connects through the adapter harness to the orange wire in the factory wiring. Both are power so reversing them won't cause damage but it will cause weird symptoms.
While you're checking, connect your unused orange/white wire to either orange or orange/white in the adapter harness - whichever one goes to the brown wire on the factory side.
I think we're looking in the right place since reinstalling the old radio works properly. We just have to find what it is about the aftermarket HU installation that is causing the problem.
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Aftermarket -> Factory
red -> yellow
yellow -> orange
black -> black
orange -> gray (most aftermarket HUs won't have this wire)
orange/white -> brown
blue -> pink (Firebird only... used for power antenna)
white -> tan
white/black -> gray
gray -> light green
gray/black -> dark green
green -> brown
green/black -> yellow
purple -> dark blue
purple/black -> light blue
Note: There are colors used more than once in the factory harness. The power, ground and front speaker wires are in the black connector. The rear speakers are in the white connector.
Other wires:
brown -> (not used these days... it was for some devices that required an external mute signal)
blue/white -> aftermarket amplifier remote turn on (not used with Monsoon amp)
light green -> parking brake switch (used for GPS and video safety)
purple/white -> backup lights (used for backup camera activation)
Plug the aftermarket harness adapter into the factory connectors and then check that the adapter wires match up with the corresponding factory wires.





