Bypassed The Stock Amp, But It Wont Work?

[Elmo-Ice]

I got a IS200 sport, and I wanted to get rid of the stock radio for a mp3 one.

So I simply removed that stock amp and connected all the wires up to the head unit, except for those 4 wires left,the tweeters.

So I got the Battery 12v, acc, ground, and the speakers connected to the player now.

When I try to turn it on, it only stays on for like 5secs. All fuses are okay.

I have a JVC KD-F421 if that changes anything. And the player is brandnew and works fine in our other car.

So bottomline, what is it that I´m missing?

[Geoffers]

If that is the case then it can't cope with the low impedance of the Lex speakers. With you saying it goes off after a short time, my guess is that the output transistors are shutting down.

To confirm this, just use the front outputs of your system but wire the LEX front and rear speakers in series and leave the outputs you will have left just open circuit. (this is fine with modern equipment, contrary to popular belief)

[Geoffers]

Was going to look up the speccy but can't find the model on the JVC site?

[Elmo-Ice]

Ohh sorry hit the wrong letter, was suppost to be KD-G421

That might just work I´m going to go try it, thanks alot! :D

[Elmo-Ice]

I just tried unpluging the rear speakers..

And it did not work :(

Any other ideas?

[Elmo-Ice]

I just tried unpluging the rear speakers..

And it did not work :(

Any other ideas?

[Elmo-Ice]

I just tried unpluging the rear speakers..

And it did not work :(

Any other ideas?

[Geoffers]

Did you put them in series with the front speakers though? (increasing the impedance)

This obviously isn't permanent but once you know what it is you can work a way around it.

[redz_UK]

is the unit in some kind of demo mode or does it need a security 'key'..

my kenwwod does exctly this if the power has been lost to and the demos/security feature is still on...

[Fargo]

or you could go bet that ISO/bypass lead that goes on eBay and plug it in and be done with it

[Elmo-Ice]

The unit works great on other car.

Well if i order that from eBay, then i will have too wait 3-4 weeks.

What I just tried a few moments ago, just unplugging all the speakers and checking if it would stay on, didn´t work

Shouldn´t that work?

Saw this at my.is forum

From OEM radio harness:

Ground: Brown

Constant 12v = Blue yellow stripe

Accessory (switched 12v) = Grey

Illumination = Green

OR

From cig lighter plug:

Illumination

Most of the time illumination is positive = green with silver dot

If that doesn't work then you need negative, use the green with white stripe.

Illumination, don´t remember that wire, is that maybe the problem?

[DJ Wozza]

Sounds to me like it's fooked (DJ technical terminology) or like someone suggested above

some kind of security setting.

I am sure someone on LOC was selling a used bypass cable they had cheap. Much the better option, but hey it's your money.

[aaronabbott]

Sounds to me like it's fooked (DJ technical terminology) or like someone suggested above

some kind of security setting.

I am sure someone on LOC was selling a used bypass cable they had cheap. Much the better option, but hey it's your money.

mattstheone's selling his

[Geoffers]

Ok, works great on any other car means it is either the wiring or the impedance as I've been saying.

With no outputs connected at all, I would expect it to shut down.

Have you tried wiring the front and rears in series yet?

Ignore illumination for now, this is only for lighting change when your headlights are on.

Those wiring colours are correct. Just in case there is a difference, take your live and gnd from the cigarette lighter socket. connect the switched live+perm live together for testing purposes.

If it still doesn't work with that and the speakers in series, then I can't understand how works in another car.

The JVC spec from the manual :

Load Impedance: 4 Ω (4 Ω to 8 Ω allowance)

[Elmo-Ice]

It´s fixed. Thanks, I connected the Acc and Battery on same wire, But i´ll have too Turn it off every time. :/

[DJ Wozza]

If a jobs worth doing it's worth doing wrong