To those who are interested in having the
'Rear door speakers ON AT ALL TIMES':
You are exactly where I was when I thought to alter the 4Runner's speaker wiring to allow continuous operation of the rear door speakers. As you may have already realized, the stock headunit's sound quality is pretty pathetic when "Party mode" is set to the
OFF position; which almost forces you to opt for the PM on feature! But then the problem is that you lose the rear door speakers... "I'm going over this slowly for the benefit of those who may have read the "PM Composition" but either didn't fully understand it, or believed it required more work to execute than the benefits were worth!"
My first approach was to rearrange the speaker wiring at the hu's rear panel and relay terminals in the passenger-side kick panel. I had already drafted a new plot of how the speaker wiring would need to be changed to allow constant operation of the rear door speakers. But when I saw the poor wire access between the many junctions that are buried behind the dash, I decided that there would have to be another way to get it done. I let it go for a couple days and then it hit me... instead of rearranging the speaker wiring, I could just leave it as it is and kill the relay coils, preventing them from operating.
The
'DEFAULT' relay contact position (PM-OFF/RLY COILS DE-ENERGIZED) allows constant operation of the rear door
'AND' tailgate speakers in a
series wiring configuration. So they can all be left turned on to work together! But the benefit to all of this is having the ability to activate the headunit's EQ filter without disconnecting any of the truck's tail or door speakers! Disconnecting the speaker selection relays and having the PM button on will also provide a much richer sound quality throughout the entire program signal's dynamic range!
Making the change is very simple: First remove the HU. Now remove the small trim panel that houses the PM button. You're going to cut the
White wire at the
#1 terminal on the hu... no need for me to rewrite these easy dirctions, just follow these simple steps w/pictures and you'll be done in 20 minutes!:
http://www.toyota-4runner.org/1730717-post1.html ...you don't need to read the whole composition, just the part instructing how to move and terminate the one white wire. This is the part that
By-passes the relay coils and so prevents them from disconnecting the rear door speakers!
HERE'S THE WIRE TO CUT AT THE HU REAR PANEL "See red arrows"
Take a look at these instructions and let me know that you're understanding them,
Cheers!