No Accecories power from the car

[Rhin0o8]

Hi guys,

Trying to connect a new Pioneer HU to my VS commodore

HU = DEH-4250SD

Got the wiring diagrams and located all wires
checked with light meter.
Found that I have no live wire on the stock loom accessories wire. only on Constant power wire
checked with car off.. switched to acc on... switched car completely on .. still doesnt register the light meter. why is this so?

Round two

just connected both constant and acc wires from the HU to the stock Constant power wire and have got power to the HU this way.

But now have no sounds coming from the speakers.

please help

[holdenboy]

Check the fuse under the steering wheel, its probably blown.

You have connected all the speakers properly?

[Rhin0o8]

yes, connected all 4 sets
- and +

what would explain no accessories power to start with ?

[Rhin0o8]

checked the 7.5a "Radio" Fuse it is blown

replace this and I may be on the way to solve my problem?

[StoneX]

If the unit powers up but has no sound, you have a speaker wire touching ground or you've blown the amp in the head unit by hooking wires up incorrectly.

[Rhin0o8]

Ive replaced the "Radio" 7.5a fuse and now have accessories power into my HU
Still no sound
I Cant get power to my Amps.
Mono amp for the sub and 4x700 amp for the speakers. both fuses on these amps are still good
Fuse is still good in the HU

Id be ok if i did the job myself, but im coming in half way through from someone else's job, so having a hard time tracking the wiring

[Rhin0o8]

Ok..

Ive found where the amps get their power
above the battery there is a 12v ?? "box" with 4 prongs and wires clipped into it ??
from the battery there is a wire going directly to this box
then a thicker wire goes from this "box" to a Fuse in a glass cylinder and follows through the firewall into the car
another wire from the "Box" is grounded very short to a bolt
the 4th wire is tapped into another wire coming from the main fuse box . ( A Thick Pink wire)

all is connected and fuse under the hood is intact.

traced the wires into the Boot . 2 more quite large fuses in glass cylinders. these are still good.

But still no power to my amps???

Please Help.
Greatly appreciated

[acarmody]

I think we are going to need pictures.

For amp to get power, there must be a cable directly to the battery with usually 1 fuse on it close to the battery. Don't use any factory wire to power amps, they aren't thick enough.

[Rhin0o8]

Photo Attached ... apologies for poor Paint editing lol

Red cable from Battery to this mystery "Box"

Blue/Black wire = ground

Purple into red wire. taps into a quite thick Pink cable direct from Main Fuse box

The insulated wire exiting the picture at about 10 O'clock is the thick red cable with goes through the Firewall.. a Fuse is attached to this inside the engine bay

any more questions just ask

as you can see this is why im pulling my hair out ! lol

[acarmody]

That is definitely not going to power a sub and may catch fire if you try. Get a real amp wiring kit and use it.

[Rhin0o8]

This is what was in the car when I bought it .

Had a clarion system running fine.
Only problem the HU had a scrambled screen so couldnt see the display

I pulled the old HU out and disconected the sub/amps from battery power.
now when Ive come around to have the time and patience to replace the HU. there is no power to the amps

[StoneX]

Go to a car audio shop or find someone who knows what they're doing in person.

Do you know what wires are required for an amp to turn on?

I'm sorry for sounding rude but it sounds like you have no idea and playing with this stuff without the proper knowledge can end up in a fire.

[madnuts]

rhino where are u from

[Rhin0o8]

Did some more research.
Ive been told
The photo above is acting as the accessories relay and not powering the amp as such

@StoneX. wouldnt bother me if youre rude or not. Its your rep you may tarnish. any and all criticism is welcome.
thats why im here, to ask questions and Learn

@madnuts. im at Adelaide, I can see youre from Sydney?. Thanks for your interest. if you can help further, Id appreciate it.

[StoneX]

This is really simple to work out in person, it'd take 5 minutes with a multimeter.

Get out of the engine bay, go to where the amps are... Measure the voltage at the amps terminals (measure + and - and remote/system terminals). Put the negative probe onto bare metal in the car, don't use the ground terminal on the amp.

Amps only need 3 things to turn on... Constant power, a good ground and the remote turn on wire from the head unit. If all 3 of these are good, the amp will turn on as long as it's not faulty. So first thing you do is check those 3 things with a multimeter.

[acarmody]

Rhin0o8 have the amps worked before or have you just added them and they aren't working?

Try what StoneX has suggested in the above comment. So to test Power cable, its DC-volts with the red probe on the power cable and the other probe on some bare piece of chassis metal. Accessory power is the same but ignition will have to be on. And Negative cable is with a Continuity test, one probe on negative cable and other on chassis.

[Rhin0o8]

Thanks for your help,

The car just got home, Ill check tomorrow in Daylight.

[Rhin0o8]

I got curious to work out why this system has been wired up with that relay above the battery

From the information i have gathered i understand that they have used this relay and tapped into the main fuse box to a wire controlled by ACC/IGN.
whilst running 2 amps it is easing the current on the "Remote on wire" from the HU
this way it still turns on the amp when the car is on ... and turns the amp off when the car is off
In my system it powers the mono amp for the sub
The "Remote on wire" from the HU powers the 4 channel amp for my speakers
amp is powered on when the HU is switched on and powers off when the HU is off

is this all correct ? anything incorrect, please correct it
I may be far from an expert, but im learning alot from this

Thanks again

[holdenboy]

I cant comment on the wiring at the battery...need to see / test it in person.

But from my understanding of that, the amps (+) terminal wires gets turned off when the ignition turns off?

[ToMMMaY]

unnecessary wiring just Redo it yourself if your still having problems your equiptment is faulty for shure

[Rhin0o8]

Finally got power to the amps

HU has 2 RCA outs. I needed 3 ( bloody thing was advertised with 3 RCA's thats why i bought it)
bought 2 splitters to overcome that problem
had front speakers going but no sound in the Parcel shelf
swaps RCA's still nothing .
Plugged in the Sub and it was opposite
got sound through Sub and Parcel shelf but nothing in the front
any suggestions?

[StoneX]

How'd you get power to the amps?

[Rhin0o8]

I found a little magical thing called the "Remote On Wire" .
HU labelled it as "System remote control" . the one ran from the amps must have fallen down inside the console.

Plus i left it for awhile and went back to it with a fresh look.
had other things to do on the car Top radiator hose split and drowned my engine bay.
replaced spark plug leads before i found a stuffed coil and replaced that also.

as for the speakers not working front and back all at once. I admit my girlfriend tweaked a few things and got it done in her lunch break today.
This car is her daily drive so she got the logistics of the sound sorted to her specifications.

I guess this is Problem solved.
Now onto my VT. when i have the cash.

Big Thanks to all the help, hints, tips.

[StoneX]

Shit hey, that old remote wire