Stock Sub working w/ aftermarket hu
Thread Starter
Driver
Joined: Sep 2008
Posts: 133
Likes: 1
From: NJ
since the stock sub amp is used, you don't have to worry about ohms...a sub that is 2 ohms needs an amp that can output at 2 ohms...it has nothing to do with the headunit...everything should be ok...
Just finished up my install. Everything works as twong82 said.
Question for the guys that used the Crutchfield harness. Did you guys hook up the amp turn on wire from the Crutchfield harness to the amp turn on wire of the aftermarket head unit harness?
Question for the guys that used the Crutchfield harness. Did you guys hook up the amp turn on wire from the Crutchfield harness to the amp turn on wire of the aftermarket head unit harness?
Hopefully I can help you.
I didnt cut any harness and hardwire. Just used the supplied Crutchfield harness/adaptor...spliced some power, ign, ground, and turn on wires to the aftermarket headunit harness and plugged it all in. Had to use a ground loop isolator for my stuff thugh. Bought a RCA to speaker wire adaptor to get the sub working. I just plugged in the end leads of the adaptor into the factory plug and taped them together.
I didnt cut any harness and hardwire. Just used the supplied Crutchfield harness/adaptor...spliced some power, ign, ground, and turn on wires to the aftermarket headunit harness and plugged it all in. Had to use a ground loop isolator for my stuff thugh. Bought a RCA to speaker wire adaptor to get the sub working. I just plugged in the end leads of the adaptor into the factory plug and taped them together.
Do I need to bypass the factory amp to get rid of the whine?
Last edited by howiedoit; Apr 8, 2009 at 08:16 AM.
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Lexus Test Driver
Joined: Jun 2008
Posts: 1,257
Likes: 1
From: Hell
Same question for me. I'm getting alternator whine after installing my Kenwood DNX5120 with the Crutchfield harness. I'm using the RCA's to the headunit. Everything else is factory stock. I got the factory sub to work like you described...I tapped into those 2 wires, but I get the whine whether or not I hook into the factory sub.
Do I need to bypass the factory amp to get rid of the whine?
Do I need to bypass the factory amp to get rid of the whine?
I just installed my headunit. I bypassed the factory amp, which is underneath the CD changer in the trunk because I was getting alternator whine. I tapped into the wires that the OP posted and connected it to my headunit through an RCA and everything works (all speakers and sub) with no more whine!
Thanks OP!
Thanks OP!
tried this, didn't work.
Using the intellexual diagram for the sub amp, I was going to run wire from the head unit straight to the amp itself, but weird thing: The wiring harness that plugs into the sub amp, it does not have all 10 pins! Either pin 1 (or pin 4 depending on how you look at the diagram) does not even have a wire running through it from the harness - yet with the stock head unit, my sub was working fine. Any thoughts/ideas?
Using the intellexual diagram for the sub amp, I was going to run wire from the head unit straight to the amp itself, but weird thing: The wiring harness that plugs into the sub amp, it does not have all 10 pins! Either pin 1 (or pin 4 depending on how you look at the diagram) does not even have a wire running through it from the harness - yet with the stock head unit, my sub was working fine. Any thoughts/ideas?
Lexus Test Driver
Joined: Jun 2008
Posts: 1,257
Likes: 1
From: Hell
tried this, didn't work.
Using the intellexual diagram for the sub amp, I was going to run wire from the head unit straight to the amp itself, but weird thing: The wiring harness that plugs into the sub amp, it does not have all 10 pins! Either pin 1 (or pin 4 depending on how you look at the diagram) does not even have a wire running through it from the harness - yet with the stock head unit, my sub was working fine. Any thoughts/ideas?
Using the intellexual diagram for the sub amp, I was going to run wire from the head unit straight to the amp itself, but weird thing: The wiring harness that plugs into the sub amp, it does not have all 10 pins! Either pin 1 (or pin 4 depending on how you look at the diagram) does not even have a wire running through it from the harness - yet with the stock head unit, my sub was working fine. Any thoughts/ideas?
I did run all new speaker wires and bypassed the amp in the trunk, but I thought the sub amp would still work, I guess not
Lexus Test Driver
Joined: Jun 2008
Posts: 1,257
Likes: 1
From: Hell
I really have not had a chance to try it as of yet............no time lol
Hrmm, i'll try to wire the sub directly the sub out with new wires and see if that works.
Im looking at the installation manual and if you check page 10, you can wire the sub directly to the rear speaker wires. There's also a note: "When using a subwoofer of 70W (2ohms), be sure to connect V & V/b leads. Do not connect anything with the G & G/B leads". I have no idea what the specs are on the stock sub, so i'd appreciate if someone here can enlighten me
Im looking at the installation manual and if you check page 10, you can wire the sub directly to the rear speaker wires. There's also a note: "When using a subwoofer of 70W (2ohms), be sure to connect V & V/b leads. Do not connect anything with the G & G/B leads". I have no idea what the specs are on the stock sub, so i'd appreciate if someone here can enlighten me