CD autochanger connector configuration - help please - Page 2

obiwan · 28th February 2009, 21:14

Quote:

Originally Posted by hans.schaaper

Do you measure +12V between the Purple/Pink and the Black using your multimeter with the key in position 1 [accessories on]?

I presume not.

No I didn't, but I can do so tomorrow. All this stuff is new to me! What I did do was test Purple/Pink (+ve probe) and connected -ve probe to -ve battery terminal, both with ignition off and with engine running and got 0V (no reading) on both occasions.

Quote:

Originally Posted by hans.schaaper

When you supply +12V externally [like you did], do you have sound from the CDC?

I applied 12V on the bench (CDC removed from the vehicle), so wasn't able to test for sound. (I had already removed the CDC and simply wanted to see if the CDC would power up with a direct power supply, which it did).

Ben

hans.schaaper · 28th February 2009, 21:26

You did answer my question, I do apologize.
I was working on two replies at the same time.

Is it possible the CDC loom has been disconnected from the main loom somewhere along the line?
Can you follow the CDC loom?

Hans

obiwan · 28th February 2009, 21:32

Quote:

Originally Posted by hans.schaaper

You did answer my question, I do apologize.
I was working on two replies at the same time.

Is it possible the CDC loom has been disconnected from the main loom somewhere along the line?
Can you follow the CDC loom?

Hans

No problem, you are being very helpful! It is not obvious to me how to follow the main loom to see if it has been disconnected. If it was disconnected from the main loom then wouldn't I show no reading on all wires at the CDC connection? (I am getting 12V on the K bus - Red/White/Yellow wire).

Do you know if there is a separate fuse for the CDC loom? Would such a fuse only affect the permanent live (Purple/Pink), or all wires on the CDC loom?

hans.schaaper · 28th February 2009, 22:08

Purple/Pink [in my car R75] comes from the fuse box passenger side F22 15A.
This fuse also powers the radio.
The I or K bus is completely separate and always powered on.

It is also possible the previous owner installed a fuse inline somewhere.

I would apply +12V to the CDC directly [in the car] and see if you get sound from the CDC.
You should also be able to select CD 1-6 and track from the headunit.

If that all works you must work out why the 12V is not getting to the loom.

Hans

obiwan · 1st March 2009, 08:36

According to my owners manual I have two fuses for the 'audio system' - F11 5A and F33 15A. Both these fuses are present and intact. So I need to find out why the Purple/Pink is not live.

Hans, I will try your suggestion of powering the CDC directly and seeing if everything works that way. If that works then my Purple/Pink must certainly be the problem.

How would I go about tracing the Purple/Pink back through the loom?

Is the CDC loom separate to the main audio system loom; can it be disconnected and replaced without replacing the whole loom?

Is it a complex task to replace the whole audio system loom?

Would it be possible/easier to trace back the Purple/Pink and repair/replace only this wire?

Sorry for all the questions, this is really starting to annoy me!

Ben

Greeners · 1st March 2009, 09:19

The loom for the CDC comes straight out the back of the head unit and into the changer.

I would suggest check the head unit as there are no connectors mid way.

Your location may also help, if another member is local.

Greeners · 1st March 2009, 09:23

oh....and what head unit is fitted......?

obiwan · 1st March 2009, 12:44

Quote:

Originally Posted by Greeners

oh....and what head unit is fitted......?

I've no idea what it's called. It's the one with the sat-nav/TV etc; 4:3 screen on the left and controls and tape deck on the right.

Are they easy to remove? I'll do a search.

Greeners · 1st March 2009, 13:26

Quote:

Originally Posted by obiwan

I've no idea what it's called. It's the one with the sat-nav/TV etc; 4:3 screen on the left and controls and tape deck on the right.

Are they easy to remove? I'll do a search.

That's fine....It's the standard sat nav set up rather then the Kenwood as the clours in the loom are different.

obiwan · 1st March 2009, 20:36

OK so today I confirmed the problem with my car. The permanent live wire to the CD changer is not functioning. I am at a complete loss to explain why.

I also pulled out the head unit and confirmed that both the permanent live and the K bus were reading 12V at the back of the head unit.

I don't know the layout of the wiring loom but is there anywhere obvious between the back of the head unit and the boot where the permanent live could fail / open circuit??

1st March 2009, 09:19	#16
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	The loom for the CDC comes straight out the back of the head unit and into the changer. I would suggest check the head unit as there are no connectors mid way. Your location may also help, if another member is local. __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

1st March 2009, 09:23	#17
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	oh....and what head unit is fitted......? __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

28th February 2009, 21:26	#12
hans.schaaper Avid contributor rover 75 2.5 V6 auto Join Date: Feb 2008 Location: Alkmaar Posts: 197 Thanks: 0 Thanked 3 Times in 3 Posts	You did answer my question, I do apologize. I was working on two replies at the same time. Is it possible the CDC loom has been disconnected from the main loom somewhere along the line? Can you follow the CDC loom? Hans

28th February 2009, 22:08	#14
hans.schaaper Avid contributor rover 75 2.5 V6 auto Join Date: Feb 2008 Location: Alkmaar Posts: 197 Thanks: 0 Thanked 3 Times in 3 Posts	Purple/Pink [in my car R75] comes from the fuse box passenger side F22 15A. This fuse also powers the radio. The I or K bus is completely separate and always powered on. It is also possible the previous owner installed a fuse inline somewhere. I would apply +12V to the CDC directly [in the car] and see if you get sound from the CDC. You should also be able to select CD 1-6 and track from the headunit. If that all works you must work out why the 12V is not getting to the loom. Hans

1st March 2009, 08:36	#15
obiwan Regular poster MG ZT 260 Mk II SE Join Date: Feb 2009 Location: Perth, Australia Posts: 56 Thanks: 0 Thanked 0 Times in 0 Posts	According to my owners manual I have two fuses for the 'audio system' - F11 5A and F33 15A. Both these fuses are present and intact. So I need to find out why the Purple/Pink is not live. Hans, I will try your suggestion of powering the CDC directly and seeing if everything works that way. If that works then my Purple/Pink must certainly be the problem. How would I go about tracing the Purple/Pink back through the loom? Is the CDC loom separate to the main audio system loom; can it be disconnected and replaced without replacing the whole loom? Is it a complex task to replace the whole audio system loom? Would it be possible/easier to trace back the Purple/Pink and repair/replace only this wire? Sorry for all the questions, this is really starting to annoy me! Ben

1st March 2009, 20:36	#20
obiwan Regular poster MG ZT 260 Mk II SE Join Date: Feb 2009 Location: Perth, Australia Posts: 56 Thanks: 0 Thanked 0 Times in 0 Posts	OK so today I confirmed the problem with my car. The permanent live wire to the CD changer is not functioning. I am at a complete loss to explain why. I also pulled out the head unit and confirmed that both the permanent live and the K bus were reading 12V at the back of the head unit. I don't know the layout of the wiring loom but is there anywhere obvious between the back of the head unit and the boot where the permanent live could fail / open circuit??