Head Unit Probs

[Daboss]

Hey I just installed an afm head unit in my r33. everything works fine except the rear speakers i can hear sound but its not loud at all not like the front speakers. I am using the factory speakers no subs or anything? Does ne1 have a suggestion to solve this also my antenna goes up as the unit is turned on and never goes back down. how can I get it to go up with the tuner and down when tuner is not being used. With the previous jap afm head unit it worked fine but after i installed my pioneer deh-p4800mp it just stays up as unit is powered on. I dont want it up unneccesarily as it takes away from the car to me any suggestions as to how tto solve this?and the wiring is correct as i went over it three times. The new head unit also has a wire tht connects to the poer antenna wire of the terminal so it should work right?

[RANDY]

So what was the HU's wire for the power antenna wire called?

As for the speakers, you've checked the fading on the HU, right?

Let us know what you have and haven't tried so we can narrow down your options! =-]

[n15m0]

for the speakers...try swapping +ve and -ve around...at the speaker terminals.

[Daboss]

So what was the HU's wire for the power antenna wire called?

As for the speakers, you've checked the fading on the HU, right?

Let us know what you have and haven't tried so we can narrow down your options! =-]

The wire for the power antenna can be connected to the system control of the power amp or auto antenna relay control terminal thats wht it says and yea i faded the speakers and only a little sound comes out no matter how much i turn the head unit up i didnt try switchin the +ve and -ve leads tho cus i wired the HU to a tee plus the crimp caps I have dont allow to interchange +ve and -ve but guess I will have to try that somehow. I tried the balnce once I faded cut ont the amp(HU's Amo that is) and still the same thing can hear the song but no volume just stays exactly at the same low level sounds like only mids are coming through but no up and down.

[RANDY]

Ah! I ask because that's your problem.

That's the "remote" wire for an amp. It sends out a constant voltage to keep an amp turned on. Using that for an antenna will force the antenna on (up) whenever the HU is on.

You need to find your "p.cont" or "ant" wire from the back of the HU.

For the speaker thing, I don't quite understand what you're saying or how you hooked the speakers up. Some Tee thing?

Switching the + and - usually restores bass to speakers that are "out of phase" from one another. i.e one is pushing while one is pulling, therefore cancelling each other out. This could be worth a try definately.

[RANDY]

Or, as Chris pointed out once, install a switch for that wire, so you can put the antenna up or down when you need it.

Apparently you CAN still buy HU's that DON'T support an electric antenna properly.

4 years ago I bought a Kenwood headunit from Cash Converters. It was 2 years old at the time, and IT still had the right cabling for the antenna. lol

[Daboss]

Or, as Chris pointed out once, install a switch for that wire, so you can put the antenna up or down when you need it.

Apparently you CAN still buy HU's that DON'T support an electric antenna properly.

4 years ago I bought a Kenwood headunit from Cash Converters. It was 2 years old at the time, and IT still had the right cabling for the antenna. lol

Lol lol I was sayin that i wired the HU correctly thats all. I will go check it out again just to make sure and the only wire i see on the head unit tht has anything to do with the antenna is the same wire we are talking bout. I cant believe they make head units without a wire to control the antenna being up or down when needed.

[Daboss]

Lol lol I was sayin that i wired the HU correctly thats all. I will go check it out again just to make sure and the only wire i see on the head unit tht has anything to do with the antenna is the same wire we are talking bout. I cant believe they make head units without a wire to control the antenna being up or down when needed.

Well I just finished checking the wiring and I reversed the wires on the rear speaker polarities to make sure i didn't have +ve going to -ve, it didn't work same thing happened rear speakers are virtually nonexistant. Can hear the music playing out of it but no bass and when I have the cd deck on full blast the speakers have hardly any music coming out of it. Does ne1 think tht the speakers could be blown cus the wiring is not the problem.

[RANDY]

They don't distort, right? And they stay the same level no matter what?

If the speakers were blown, i'd imagine that they wouldn't work at all, or if the cone was damaged from age/sun, it'd distort.

Can you quickly plug a front output into one of the rears and retest?

[Chris Rogers]

you have an amplifer on the rear speakers. what car EXACTLY?

[Daboss]

you have an amplifer on the rear speakers. what car EXACTLY?

No amp just the heads units amp and its a 95 gts-t. Switched the +ve and -ve wires still the same prob sound stays at one level no matter how high I turn the HU up. Didnt switch the rears with the fron tho may have to try tht.

[RANDY]

Take a pic of the wiring when you're there. You might be able to get someone to confirm the colour-coding.

[donut_kng]

Well I just finished checking the wiring and I reversed the wires on the rear speaker polarities to make sure i didn't have +ve going to -ve, it didn't work same thing happened rear speakers are virtually nonexistant. Can hear the music playing out of it but no bass and when I have the cd deck on full blast the speakers have hardly any music coming out of it. Does ne1 think tht the speakers could be blown cus the wiring is not the problem.

Your antenna problem is due to you having a Pioneer head Unit, as they only have one remote or trigger wire which is common for an amplifier and an antenna.

As someone mentioned, Kenwood head units have 2 wires, both are blue, one which is a constant power remote for the amplifier which is labelled P.CONT and the other a constant power which the head unit activates ONLY when the source is set to TUNER, (when your listening to the radio) this is labelled as ANT.CONT. The only way to solve your problem is a switch, or to buy a Kewnwood deck or just dont worry about it! But is it really that bad?

Another way to check your speckers, (assuming everything is wired right up to now) is to swap the front and rear connections at the head unit, i.e. connect the front outputs to the back speakers, pain in the ass, yes i know, but this will allow you to rule out whether the head unit itself has a problem. You could also get another pair of speakers to try it, stock skyline ones are not that great anyways so changing tem would be a good sound investment!

[donut_kng]

A way you could also check if your wiring is right, is by puling out one of the rear speakers and trying it directly off the wiring harness of the head unit, (just by holding the wires to the speaker terminals momentarily to see if it works) this will allow you to know if you confused something with the cars wiring harness.

[donut_kng]

A way you could also check if your wiring is right, is by puling out one of the rear speakers and trying it directly off the wiring harness of the head unit, (just by holding the wires to the speaker terminals momentarily to see if it works) this will allow you to know if you confused something with the cars wiring harness.

[Chris Rogers]

take a few decent pics of what you are playing with. I'll comment off that.

[cheez]

Ah! I ask because that's your problem.

That's the "remote" wire for an amp. It sends out a constant voltage to keep an amp turned on. Using that for an antenna will force the antenna on (up) whenever the HU is on.

You need to find your "p.cont" or "ant" wire from the back of the HU.

For the speaker thing, I don't quite understand what you're saying or how you hooked the speakers up. Some Tee thing?

Switching the + and - usually restores bass to speakers that are "out of phase" from one another. i.e one is pushing while one is pulling, therefore cancelling each other out. This could be worth a try definately.

the problem your having with the back speakers is one that i have solved coz i had teh same prob, what u have is both positive of the speakers connected to 1 speaker on head unit and the 2 negatives connected to the other speaker wires from the hu. take 1 from each side and problem solved!!!