I installed my new head unit....but no sound - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

1stcar240sx · 12-24-2002, 03:38 PM

I know that all the hookups are correct (speaker wires). I have the "active" stereo thing ...could it be that the amps are no longer turning on and therefore endingf the signal...what shoulod i do. Do i need to get speaker wire and bypass the stock "amps" or what. I have a 91 s13 w/ pioneer deh7400. The stereo has an amp turn on wire do i ned to wire this up?

1580 · 12-24-2002, 03:54 PM

i hope you are using a wire harness. either way, you have to send a remote turn on to the factory amp to get sound. its either going to be blue w/ white stripe or just solid blue depending on the new radio. if you are using a harness then its going to just be color to color. if not, then whatever wires you have left one of them will be the amp turn on wire. the easiest way to find it is to plug the factory radio back in turn it on and meter the wires on the factory amp the one thats reads 12v with the ignition on and 0v with it off is going to be your turn on wire. it will be the same color behind the radio. hope this helps

1stcar240sx · 12-24-2002, 04:43 PM

thx a bunch...wired that wire up and now it works....now time to go (online) get an amp...audiobahn 6.5 components (carbon ones)....and maybe a sub if the money keep up.

mbmbmb23 · 12-27-2002, 07:30 PM

You'd better bypass that "active" amp thing, I heard you can actually LOSE watts with that amp....like.......it only lets a certain amount of watts through (10-15..or whatver it is).....so if your head unit is sending 25 watts......15 goes thru, 10 gets wasted.

-m

*HaLo* · 12-27-2002, 08:55 PM

Agreed. You have to bypass the factory "active speaker" amps. If you don't, no sound will come out of the speakers.

Black240Matt · 12-29-2002, 01:23 AM

sound will come out, its jsut quieter, i bypassed mine

*HaLo* · 12-29-2002, 11:23 AM

That's weird... Because we didn't hear anything when the active speaker system wasn't bypassed.

12-29-2002, 02:09 PM

I didn't bypass mine. Bought a wire harness at Best Buy (company named "Turbo" produces them). The amp is the baby blue -w- white. The harness provides a different color for the amp, you just gotta match them up. I get great quality sound out of my CD player, never had a problem.

-I.M.

gfisch · 12-30-2002, 10:15 AM

My experience was that it worked, when I used a harness, but sounded like crap. Sounded much nicer when I bypassed it. You bought a new head unit, might as well take advantage of its amp. There are threads on here what wires need to be jumpered together on the factory amps to bypass them.
But, If youre gonna get a new amp anyways, I'd wait till you get it and pull all new wires. Thats what I did.

12-24-2002, 03:38 PM	#1
1stcar240sx Leaky Injector Join Date: Nov 2001 Posts: 70 Trader Rating: (0) Feedback Score: 0 reviews	I installed my new head unit....but no sound I know that all the hookups are correct (speaker wires). I have the "active" stereo thing ...could it be that the amps are no longer turning on and therefore endingf the signal...what shoulod i do. Do i need to get speaker wire and bypass the stock "amps" or what. I have a 91 s13 w/ pioneer deh7400. The stereo has an amp turn on wire do i ned to wire this up?

12-24-2002, 03:54 PM	#2
1580 Join Date: Dec 2002 Location: midwest Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	radio i hope you are using a wire harness. either way, you have to send a remote turn on to the factory amp to get sound. its either going to be blue w/ white stripe or just solid blue depending on the new radio. if you are using a harness then its going to just be color to color. if not, then whatever wires you have left one of them will be the amp turn on wire. the easiest way to find it is to plug the factory radio back in turn it on and meter the wires on the factory amp the one thats reads 12v with the ignition on and 0v with it off is going to be your turn on wire. it will be the same color behind the radio. hope this helps

12-27-2002, 08:55 PM	#5
HaLo from Canada, eh! Join Date: Sep 2001 Location: Montreal, Quebec Age: 46 Posts: 5,201 Trader Rating: (0) Rides Gallery: HaLo Feedback Score: 0 reviews	Agreed. You have to bypass the factory "active speaker" amps. If you don't, no sound will come out of the speakers. __________________ -> HaLo Race Car: '98 E36 BMW M3 Daily Drivers: '23 Audi Q4 e-tron & '13 VW Touareg SOLD: 01 GPW Honda S2000 PARTED: 93 Pearl White 240SX LE Fastback w/SR20DET SOLD: 93 Super White 240SX SE Convertible w/Silvia Front

12-29-2002, 11:23 AM	#7
HaLo from Canada, eh! Join Date: Sep 2001 Location: Montreal, Quebec Age: 46 Posts: 5,201 Trader Rating: (0) Rides Gallery: HaLo Feedback Score: 0 reviews	That's weird... Because we didn't hear anything when the active speaker system wasn't bypassed. __________________ -> HaLo Race Car: '98 E36 BMW M3 Daily Drivers: '23 Audi Q4 e-tron & '13 VW Touareg SOLD: 01 GPW Honda S2000 PARTED: 93 Pearl White 240SX LE Fastback w/SR20DET SOLD: 93 Super White 240SX SE Convertible w/Silvia Front

12-30-2002, 10:15 AM	#9
gfisch Zilvia Junkie Join Date: May 2001 Location: Warren,NJ / Baltimore,MD Age: 44 Posts: 576 Trader Rating: (0) Feedback Score: 0 reviews	My experience was that it worked, when I used a harness, but sounded like crap. Sounded much nicer when I bypassed it. You bought a new head unit, might as well take advantage of its amp. There are threads on here what wires need to be jumpered together on the factory amps to bypass them. But, If youre gonna get a new amp anyways, I'd wait till you get it and pull all new wires. Thats what I did. __________________ Greg Fischer [email protected] '97 240SX SE '98 Ford Explorer XLT

12-24-2002, 04:43 PM	#3
1stcar240sx Leaky Injector Join Date: Nov 2001 Posts: 70 Trader Rating: (0) Feedback Score: 0 reviews	thx a bunch...wired that wire up and now it works....now time to go (online) get an amp...audiobahn 6.5 components (carbon ones)....and maybe a sub if the money keep up.

12-27-2002, 07:30 PM	#4
mbmbmb23 Zilvia Contributor Join Date: Oct 2001 Location: Charlotte, NC. Posts: 1,776 Trader Rating: (1) Rides Gallery: mbmbmb23 Feedback Score: 1 reviews	You'd better bypass that "active" amp thing, I heard you can actually LOSE watts with that amp....like.......it only lets a certain amount of watts through (10-15..or whatver it is).....so if your head unit is sending 25 watts......15 goes thru, 10 gets wasted. -m

12-29-2002, 01:23 AM	#6
Black240Matt Join Date: Dec 2002 Location: Canada Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	sound will come out, its jsut quieter, i bypassed mine

12-29-2002, 02:09 PM	#8
Mark & Irena Guest Posts: n/a	I didn't bypass mine. Bought a wire harness at Best Buy (company named "Turbo" produces them). The amp is the baby blue -w- white. The harness provides a different color for the amp, you just gotta match them up. I get great quality sound out of my CD player, never had a problem. -I.M.