Cavalier Headunit ISO Wiring

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Envoy CDX
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Cavalier Headunit ISO Wiring

Post by Envoy CDX »

Below you will see an attached file, of which it shows what pins do what job on he Vauxhall Cavalier Mk3 wiring loom

If you have any questions, please do ask.

*revised*
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vauxhall wiring loom.JPG
vauxhall wiring loom.JPG (72.61 KiB) Viewed 7711 times
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Re: Cavalier Headunit ISO Wiring

Post by Envoy CDX »

bump :) Is this now sticky worthy?
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Re: Cavalier Headunit ISO Wiring

Post by Gaz »

Yea its going to be one of those question ive stickied it
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Re: Cavalier Headunit ISO Wiring

Post by Envoy CDX »

Gaz wrote:Yea its going to be one of those question ive stickied it
kool.
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Re: Cavalier Headunit ISO Wiring

Post by dave's.veccy »

One note id like to add, the Alarm trigger wire, Brown and violet, if Earthed to your stereo casing, it will protect your stereo with the factory alarm
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Re: Cavalier Headunit ISO Wiring

Post by vaux24v »

brilliant|!!!!! i just posted on mig about this and was going to post here. some tit cut the iso off on my car lol
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Re: Cavalier Headunit ISO Wiring

Post by crocadmin »

this is good to know...mind iv fitted so many head units, subs & amps i could almost do it in my sleep lol
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Re: Cavalier Headunit ISO Wiring

Post by Robsey »

Just noticed that the diagram says that pin 5 (Blue/Red - ABS wheel speed signal for speed dependent volume control) is for the SC804...

Strange though as my Grundig SC303 Tape Radio and later my CD300 CD Radio both had this function and connection.

And just for info, this ISO layout continues on all cars upto September 2004
(i.e. this includes vectra b, omega b and early vectra c plus the similar aged astras, novas, corsas, zafiras etc).
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Re: Cavalier Headunit ISO Wiring

Post by expreaper »

I would like to know how i am able to use my head unit on ignition turn 1.

Can it be done, So far i have had to turn the red and yellow wires around so it saves the radio station and my set up ect.
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Re: Cavalier Headunit ISO Wiring

Post by Robsey »

I would like to know how i am able to use my head unit on ignition turn 1.

This cannot be done on the cavalier ignition switch, although I have read that the Vectra-B switch has pin for position 1 usage

So far i have had to turn the red and yellow wires around so it saves the radio station and my set up ect.

This is normal practice on ALL Vauxhalls, (To swap the red and yellow wires for after market headunits).
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Re: Cavalier Headunit ISO Wiring

Post by droofer »

excellent topic very useful !
thanks!
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Re: Cavalier Headunit ISO Wiring

Post by Robsey »

Robsey wrote: And just for info, this ISO layout continues on all cars upto September 2004
(i.e. this includes vectra b, omega b and early vectra c plus the similar aged astras, novas, corsas, zafiras etc).
Suppose I should clarify, that the power (Red, Black, Brown and grey/green wires, along with the speaker wires are the same).

The remaining wires in the ISO connector may have differing functions.
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Re: Cavalier Headunit ISO Wiring

Post by planetc »

except Vauxhall and Sony seem to have a difference of opinion on which is switched live and which is battery live, lol
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
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Re: Cavalier Headunit ISO Wiring

Post by Robsey »

Yep, goes for most after market makes..

Vx red to Sony / kenwood etc Yellow (Memory Live)

Vx Black to Sony / kenwood etc red (Ignition Live)

Vx brown to Sony / kenwood etc black (Chassis Ground)
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Re: Cavalier Headunit ISO Wiring

Post by cavi-martin82 »

Only way i can seem to get my cd player to light up and come on is by moving the live for cd player to re/blue wire on top left of power plug as you face it with locking pin at too also.... Is this right as it doesnt come on with any other wire thats supposed to be marked as switched ignition live....im lost lol every time i brake to a stop the cd player goes off and turns back on with me pulling away??? Please help me!!
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Re: Cavalier Headunit ISO Wiring

Post by Robsey »

Does this make it any easier to check your wires against.
iso in Cav.JPG
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Re: Cavalier Headunit ISO Wiring

Post by cavi-martin82 »

Yeh its number 5 on this diagram i have power from to my cd player?? Only one that switches on and off with the ignition
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Cavalier Headunit ISO Wiring

Post by Kevwaggy »

Rob's skills in MS Paint never cease to impress ;)
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Re: Cavalier Headunit ISO Wiring

Post by DAN90 »

Can I ask where you guys get your 12v feed from? mine (when the engine is off) cuts the stereo out because of low voltage, when running its fine. I want to re-wire the live but not sure where from. Cheers
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Re: Cavalier Headunit ISO Wiring

Post by Robsey »

DAN90 wrote:Can I ask where you guys get your 12v feed from? mine (when the engine is off) cuts the stereo out because of low voltage, when running its fine. I want to re-wire the live but not sure where from. Cheers
The radio goes off when you turn the ignition off? - This is normal. - It is what they call ignition logic.

The red wire goes to Fuse 20 (10 amps)
The black ignition live wire goes to fuse 15 (15 amps).

Some radios can have their ignition logic turned off, however it would mean that you then need to manually turn the radio on and off.
Also, if you want - Vauxhalls will normally allow you to run the radio for one hour with the ignition off, before it automatically turns off again. This is to save flattening your battery.
Just press the radio's on button for that.


If you have issues with low voltage, then this would be due to a weak battery.

The only remedy for this is a new battery.or tighten, clean the battery terminals.
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Re: Cavalier Headunit ISO Wiring

Post by DAN90 »

I have a new battery and fuses.

It's not when I switch the car off, it's when the car isn't running and I have the radio up pretty loud it will shut the radio off. If I have it at the same volume with the car running its fine. My brother said I have a bad live feed so just wondered where you get your feed from, would the caravan (number 28 fuse) constant 12v be a good source?
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Re: Cavalier Headunit ISO Wiring

Post by planetc »

Deja vu? Pie has just been through the same thing and ran a new feed wire direct from the battery to cure it.
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
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Re: Cavalier Headunit ISO Wiring

Post by DAN90 »

planetc wrote:Deja vu? Pie has just been through the same thing and ran a new feed wire direct from the battery to cure it.
Good'ol cavs :D So I'd be ok taking one from the caravan hitch constant 12v?
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Re: Cavalier Headunit ISO Wiring

Post by Robsey »

Nope -

What you need to do is run a heavier gauge wire direct from the battery, with an in-line fuse as near to the battery as possible.

Run this wire direct to the permanent live wire of your aftermarket radio's ISO connector.
Do not bother to connect it to the Car's ISO connector.

In brief
a) Thick wire from battery to in-line fuse.
b) Thick wire from in-line fuse directly to the permanent live wire of the aftermarket headunit.

I mis-understood the cause of the issue - should have guessed, it was because you are runnig a very power aftermarket head unit.
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Re: Cavalier Headunit ISO Wiring

Post by DAN90 »

Robsey wrote:Nope -

What you need to do is run a heavier gauge wire direct from the battery, with an in-line fuse as near to the battery as possible.

Run this wire direct to the permanent live wire of your aftermarket radio's ISO connector.
Do not bother to connect it to the Car's ISO connector.

In brief
a) Thick wire from battery to in-line fuse.
b) Thick wire from in-line fuse directly to the permanent live wire of the aftermarket headunit.

I mis-understood the cause of the issue - should have guessed, it was because you are runnig a very power aftermarket head unit.

I'll do that cheers, what rating fuse would you recomend?
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