Daves disco
Member
Morning. It might just be my incompetence, but I'm stumped. I have no sound.......any ideas?
Daves disco
Member
Would that be the blue wire from the new head unit to the blue/red on the existing loom?
brian47
Well-Known Member
The red/blue wire is the "System Enable" wire from the old head unit and is used to activate the audio power amplifier as well as the two aerial amplifiers. For aftermarket devices, the system enable wire might be shown as the lead to an automatic wind-up and down type extending aerial.
Here's the pin assignments for the existing ISO plugs:-
Daves disco
Member
Thanks for this. It's going to be fun.....
Spot1
Well-Known Member
It should be fairly simple.
Unfortunately the headunit I have doesn’t have the wire intended to turn on the amp installed into the iso plug but the wire is there in the bundle of wires with the two iso plugs. I’m not sure why they didn’t insert it into the plug to make that connection a little easier but hey ho....
All you need to do is join the loose blue wire in that bundle (think it was actually labelled for power aerial/antenna or something but it does the same thing) to the “system enable” wire in the vehicle loom, I think I simply cut it out of the vehicle ISO and soldered them together with a little extra wire to make up the loom length.
That should sort your problem on the no sound front.
Daves disco
Member
Sorted. Now to remove the panel
Spot1
Well-Known Member
Headunit and cage out.
Two screws pointing up at the top of that hole.
Remove ashtray and coin trays. Two screws behind each one. Remove cup holders.
Carefully pull out central locking switch and the two centre switches above the coin tray. There is one screw hidden behind these either side.
Remove the trim (that you may not have even realised was there) just below the din hole. Two screws under that.
Pull gently!
Daves disco
Member
How have you got over the issue of the ash tray and coin holder box?
Daves disco
Member
I think I’ll be having another go. My first attempt isn’t great. Issues include securing the radio and the bracket securing the existing head unit.
Spot1
Well-Known Member
I had to remove the metal bracket that goes from the bulkhead to the bottom of the original din hole as it was in the way. There’s 3 rivets into the bulkhead. If you look through the thread I linked in my main thread then you’ll see the bracket he made to support his head unit.
I riveted the brackets that came with the head unit to the facia panel. About 5 rivets either side, it’s solid!
This however has caused me problems with securing the top of the facia as I have to fix the head unit to the facia before fixing it to the vehicle and therefore am unable to insert the two screws at the top which is frustrating.... I don’t know if it’s possible to get a cage for this head unit or not but that would make it a lot easier.
I riveted the brackets that came with the head unit to the facia panel. About 5 rivets either side, it’s solid!
This however has caused me problems with securing the top of the facia as I have to fix the head unit to the facia before fixing it to the vehicle and therefore am unable to insert the two screws at the top which is frustrating.... I don’t know if it’s possible to get a cage for this head unit or not but that would make it a lot easier.
Daves disco
Member
I think I may be able to rescue my first attempt. The good news is the radio works!! . More plastic filler required. Thanks everyone for your advice
Daves disco
Member
One more question. What adapter is the best for the steering wheel interface?
Spot1
Well-Known Member
I have to call pass on that one. I think you/we don’t need one and that it should be a question of connecting the wires and playing with settings.... unfortunately, they have been played with on mine by a previous owner so I need to pull the airbag out again and work out what has been done before I can tie it into the head unit.... I’d be interested in what you work out.....
As far as the head unit side, I think it’s the three brown wires in the bundle with the ISO connectors, think they’re marked as Key1 Key2 and something else.
As far as the head unit side, I think it’s the three brown wires in the bundle with the ISO connectors, think they’re marked as Key1 Key2 and something else.
brian47
Well-Known Member
You're probably going to have to consult an "In-Car Entertainment" specialist about that. The Disco system is analogue, switching different values of resistance, whereas more modern systems are possibly digital.
Daves disco
Member
I’ve been looking at options on eBay that sell discovery adapters. That’s until you tell them specifically what the current system is then it’s ‘not compatible’.
Spot1
Well-Known Member
Spot1
Well-Known Member
I can finally answer this part having eventually gotten around to tackling it. There are two wires from the steering wheel one white and one purple. One connects to the brown ground wire in the main power plug loom and the other to the “key 1” wire from the main power plug loom.
It’s an analogue system that creates different resistance between these two wires depending on which of the 5 switches are pressed/pulled.
On the head unit, go into settings then vehicle then steering wheel switches. Pushing/pulling one of the switches brings up a list of options, select the relevant one from the list and save, repeat for the remaining 4 switches. You can change the use of each switch just by selecting a different option in the list.
