Need Help Headunit Has No Power

[R33_Rob]

Hi

like the title says, my headunit has no power.

This arvo i cut the 3 wires running from somewhere( i assume my headunit) to my antenna.

I realised that i couldnt do what i wanted to, so i just reconnected the 3 wires. Now my headunit hasnt got any power :S

What gives, how could this happen when all i did was cut the wires and rejoin them to the exact same place. Do i need to disconnect and reconnect my car battery :S

[Howie]

Hmmm.. 3 wires to your antenna sounds a little odd, can you get a picture of it. Should be a standard aftermarket stereo antenna plug to your nissan diversity antenna plug.

As for power to head unit, take out the headunit, and use a tester on the yellow and red wire. You should get power on the yellow constantly, and red on accessories.

If not, trace this back and check your accessory fuses.

[R33_Rob]

I see. Ill go take a picture of it, to get my headunit out (its a shitty sony one) do i have take the dash out?

[Howie]

Just undo the bolts to the cage that holds the headunit and a/c etc. No need to remove the entire dash.

[R33_Rob]

So here is a close up of the wiring. Note that one wire has been cut. This is the signal wire which makes the aerial go up and down and is not responsible for loss of power.

[Howie]

Okay so black is ground, Red is accessories, i'm not entirely sure what the green/red is and why it has been spliced?

But anyhow, get a testing light and check the red for power when you switch to ignition/accessories.

[Trav33]

If you've cut a live wire without disconnecting the battery first, there's a good chance a fuse has blown... check ya fuse's on the drivers side kick-panel.

[R33_Rob]

Which fuse should i be looking for? I looked at the one labled "ST" i assume that was my headunit, but it was intact.

Oh and now my clock is really really dark when i have my headlights turned on.

EDIT: green/red is the signal wire which makes the aerial go up and down

Edited December 14, 2006 by R33_Rob

[Howie]

Under the R34 on mine, it's just labelled ACC and it's a 10amp. So hunt around see if any others are blown.

If your clock is dark when the headlight is on, then it's most likely another fuse. Check to see that your cigarette lighter ring still lights up when you have your headlamps on.

[R33_Rob]

Yeah the cigarette lighter ring still works

[white33gtst]

have you checked the fuse on the headunit? should b a little 10a fuse. so yeah, if you cut live wires you may have blown that fuse.

[R33_Rob]

Is that one of the fuses located under the dash?

I have checked most of them under there.

When i leave my lights on my car beeps to tell to turn them off. Now the beep is very quiet and the car beeps 3 times, each time the beep gets quieter until it goes away. Perhaps it is earthing somewhere ?? :S

[danielr34]

Which fuse should i be looking for? I looked at the one labled "ST" i assume that was my headunit, but it was intact.

Oh and now my clock is really really dark when i have my headlights turned on.

EDIT: green/red is the signal wire which makes the aerial go up and down

Green/red wire is the illumination wire when u turn your park lights on

[danielr34]

Green/red wire is the illumination wire when u turn your park lights on

check the fuses in the engine bay under the plastic cover, instruments or park lights,

ther are also fuses in the boot and a circuit breaker which says "audio" the furthest on back

[R33_Rob]

"Green/red wire is the illumination wire when u turn your park lights on"

Im pretty sure that its not the illumination. THis is because once we cut that wire, the aerial stopped going up and down. We did this a couple of months ago and the car has been fine since (until i cut those wires)

[R33_Rob]

Thanks for your help fellas.

Turned out it was one of the IGN fuses under the dash.