I was wondering if anyone had a diagram of what the pins on the back of a cd400 radio are and what the colour codes are on the wires that plug into the back of the radio mean.
I took out my dead cd400 which won't turn on at all. My garage checked and it isnt a fuse problem. I planned on tinkering with the radio outside the car using a pc power supply but I am unsure exactly which wires are the 12v lines on the wiring. Typically they are the red and yellow wires. However my wiring has two yellow wires but one has a white stripe on it and the other a blue stripe rather than being solid yellow. I doubt I can fix the radio but I would like to try.
Thanks!
Mike
14th Sep 2019 1:56 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10689
no. those sound like the can bus wires (if twisted together).
On the larger connector.
The thick black is earth -
The thick blue/purple is +
I think they have larger terminals.
That is all you should need.
Press in the volume knob and it should turn on
14th Sep 2019 3:34 pm
MikeC
Member Since: 14 Sep 2019
Location: Uk
Posts: 23
Thanks for your help PeteK.
I realised pin numbers are on the back of the connector that I pulled out the radio:
Click image to enlarge
I got the wiring diagram from one of wiggs posts on the forum:
[img]https://www.disco3.co.uk/gallery/albums/userpics/59314/informationandentertainmentsystem.pdf[/img]
I have the Lo-line system on page1-2. Indeed you are correct, Pin1 black is power ground and Pin11 (labelled VBATT in the wiring diagram and coming from the battery) is purple and is power. Both are on the main connector on the bigger holes.
Thanks for your help I will give it a go.
15th Sep 2019 8:06 am
MikeC
Member Since: 14 Sep 2019
Location: Uk
Posts: 23
Ok so I shorted green/black pins on motherboard connector on my pc power supply:
Then plugged pin1 on the back of the radio to a ground wire and pin11 to a yellow 12V wire:
Click image to enlarge
I turned on the power supply and it fired up. I pushed the radio on button and it turned on immediately:
There was a horrible CD grinding/ticking noise followed by a disk eject error but otherwise it switched to radio and remained on.
I conclude that whilst there may be something wrong with the cd player, the radio is otherwise working.
EDIT: I connected the radio back up to the car and it turned on fine, again horrible cd disk eject error noise. I guess the radio just got stuck somehow. People do often recommend disconnecting battery to fix some radio issues. maybe that's all I have really done here.
15th Sep 2019 9:15 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10689
you need a dvm or 12v test light.
Check those 2 wires in the car, on the radio connector have power.
black and purple.
Hopefully you can find of the wiring diagrams, which fuse the purple wire is fed from
The fusebox is behind the glovebox.
You empty the bottom glovebox, then push the hinges to the sides and it will drop down.
be carefully. fuses look the same in pictures, but different when in your hand
Last edited by Pete K on 15th Sep 2019 9:30 am. Edited 1 time in total
15th Sep 2019 9:26 am
MikeC
Member Since: 14 Sep 2019
Location: Uk
Posts: 23
Thanks PeteK. As a reference for others I edited my above post. I originally asked where to find the fuse for the radio and how to replace it as I presumed that the radio would not turn on in the car. However, when I plugged the radio back in the car it turned on fine. So we can conclude it was never a fuse issue. Thought I would quickly edit the post so as not to waste anyones time explaining that to me. Wasn't quick enough for Pete.
15th Sep 2019 9:30 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10689
that's a good fix then
note the fuse number, in case it needs a power disconnect another time!
15th Sep 2019 9:31 am
MikeC
Member Since: 14 Sep 2019
Location: Uk
Posts: 23
Here it is now working in the car, but still making horrible grinding/ticking noise if you try and play a CD:
I might take the radio to pieces and see if I can solve the cd eject issue.
Thanks for fuse help pete.
15th Sep 2019 9:34 am
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3170
i've read somewhere maybe on here it's the plastic cd holder's that the corner snaps on them and that's how the cd's get stuck Discovery 3 se gone
Range rover sport supercharged here:)
15th Sep 2019 10:50 am
MikeC
Member Since: 14 Sep 2019
Location: Uk
Posts: 23
Thanks Geoff. I will take a look at that. First I need a trip to screwfix to buy some small torx heads to dissect the cd player.
15th Sep 2019 10:52 am
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3170
Thanks a lot for that. That's going to save me an absolute age. Just off to toolstation now to get the right screwdrivers.
15th Sep 2019 1:27 pm
MikeC
Member Since: 14 Sep 2019
Location: Uk
Posts: 23
Ok I found the problem.
I unscrewed the four screws holding the radio front panel on and carefully folded it over the top. I connected the radio up to my power supply as I mentioned previously and turned it on:
Click image to enlarge
I saw multiple CDs in the slot. I hit Eject, and saw it struggling to spit the cd out. So I hit eject again and used some pliers to pull the top cd out. I then hit eject again and pulled the second cd out so that it was empty:
I then realised that I have the CD-400 radio that should only take 1 cd and it doesn't have a changer in it. In conclusion, one of my kids somehow stuffed a second disk into the slot and it wasn't happy ejecting two at once.
Fortunately I didn't have to take my radio completely to bits to fix this (as in the link Geoff posted). Actually that helped a lot as it dawned on me that I didn't actually have a changer like that alpine radio shown in the changer repair link.
Hopefully all is working. Now all I need to do is wire in an aux input and im happy.
15th Sep 2019 3:03 pm
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3170
Great news and hopefully a cheap fix Discovery 3 se gone
Range rover sport supercharged here:)
15th Sep 2019 3:33 pm
MikeC
Member Since: 14 Sep 2019
Location: Uk
Posts: 23
Yes, cheap fix. £7.50 to buy a set of torx screwdrivers. Annoyingly I had T10, but the radio screws holding the front of the radio onto the unit of course were T9. Why!!
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