Radio wiring diagram.

hotsnot · 04-01-18, 03:09 PM

So I've gone to swap the cassette player Apline headunit in my '87 coupe for a new one and the old one has been spliced into the cars wiring. I've ordered an ISO loom/socket but the diagram in the Haynes manual is sadly lacking as a useful wiring diagram. Does anyone have a better wiring diagram or failing that colour code pinouts? I will take a switched live fm the lighter cct as well, sick of having to remember to turn the radio off.

Cheers

Jase.

mikes2 · 04-01-18, 03:57 PM

The wiring is usually fairly standard for most Audis of that age

brown - earth
white - 12v
grey / blue - backlighting
blue / red - clock

your speaker wires will be in another group and they're usually black / green or black / white

Do not under any circumstances use a blue / white wire - that is for the vehicle speed and should never be used for the stereo.

msh · 04-01-18, 07:11 PM

Quote:

Originally Posted by mikes2

Do not under any circumstances use a blue / white wire - that is for the vehicle speed and should never be used for the stereo.

Well, but what if he is going to use normal stereo with GALA function?

That's why that particular wire is there, and it is in ISO plug as well.

msh · 04-01-18, 07:17 PM

Quote:

Originally Posted by hotsnot

I will take a switched live fm the lighter cct as well, sick of having to remember to turn the radio off.

does "87 coupe" means B2 coupe? If that would be B3, then "key in ignition" signal could be taken from ignition switch - no idea if B2 have such contact in ignition switch, althought I have some doubts...

hotsnot · 04-01-18, 07:55 PM

Quote:

Originally Posted by msh

does "87 coupe" means B2 coupe? If that would be B3, then "key in ignition" signal could be taken from ignition switch - no idea if B2 have such contact in ignition switch, althought I have some doubts...

It's a B2

hotsnot · 04-01-18, 07:57 PM

Quote:

Originally Posted by mikes2

The wiring is usually fairly standard for most Audis of that age

brown - earth
white - 12v
grey / blue - backlighting
blue / red - clock

your speaker wires will be in another group and they're usually black / green or black / white

Do not under any circumstances use a blue / white wire - that is for the vehicle speed and should never be used for the stereo.

My Alpine head unit does have speed control, so will the blue/white be ok to use?

mikes2 · 05-01-18, 01:22 PM

That will be the back light wire which will dim the display.

The blue / white wire is for the vehicle electrics - it's completely independent of the radio circuit

04-01-18, 03:57 PM	#2
mikes2 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Polmont Posts: 2,617	The wiring is usually fairly standard for most Audis of that age brown - earth white - 12v grey / blue - backlighting blue / red - clock your speaker wires will be in another group and they're usually black / green or black / white Do not under any circumstances use a blue / white wire - that is for the vehicle speed and should never be used for the stereo. __________________ 1991 90 quattro 20v sport 1991 90 quattro

05-01-18, 01:22 PM	#7
mikes2 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Polmont Posts: 2,617	That will be the back light wire which will dim the display. The blue / white wire is for the vehicle electrics - it's completely independent of the radio circuit __________________ 1991 90 quattro 20v sport 1991 90 quattro