Help identifying wires on connector C0921

[Oldmowgli]

Hi all,
I am new to this forum having recently bought a Moonstone Green Rover 75 Tourer, with KV6 2.5L engine, which has the original Symphony Radio / Casette (non sat nav) and the glovebox mounted CD changer fitted.

I am about to replace the head unit with a Pioneer DD unit, retaining the CD changer, along with the steering Wheel controls.
I have read many of the posts on this topic, and have gleaned a lot of helpful information, so thanks to you all.

But....I have searched and searched to find out what a couple of specific wires are connecting to and drawn a blank - so hope someone can enlighten me !!

On rear of the Symphony head unit there are three physically linked together female connectors:
C0983 (the Blue connector) has 7 wires serving the CD Autochanger unit - No problem with those.
C0922 (the Green Connector) is not wired, so again - No problem.

The confusion is with C0921 (the Yellow Connector) This has 3 wires - in pins 2, 3 and 6.

Pin 2 is a Purple / Pink wire which I believe to be a permanent live feed.

Pin 3 is an Orange / Grey wire - I do not know what this is serving at all.

Pin 6 is an Orange / Green wire - I am unsure what this is for too, but I have at least found a couple of other Orange / Green wires referenced in the Haynes Manual wiring diagrams. Those wires both appear to be supplied from fuse F4 in the Passenger Fusebox, and run to the Mirror Control Switch, and RH front window switch, so I also believe this wire on Pin 6 may also be a second fused permanent live feed.

Are my assumptions correct ?, if so, what is connected to pin #3 ?

and as a follow on question...where can I find the detailed line wiring diagrams that have been linked as PDF's in various posts ?

Frustratingly, the MG Rover Workshop Manual that arrived today, does not seem to contain any wiring diagrams at all, and even the PDF'd line wiring diagrams don't seem to show this connector / wires either.

I am sure someone will know....

Thanks,
Oldmowgli
Brisbane, 4163 Queensland.

[SD1too]

I can help Martin.

Originally Posted by Oldmowgli

The confusion is with C0921 (the Yellow Connector)
Pin 2 is a Purple / Pink wire which I believe to be a permanent live feed.

Yes it is, from fuse 22 in the passenger compartment fusebox.

Pin 3 is an Orange / Grey wire - I do not know what this is serving at all.

It's labelled as "telephone audio +".

Pin 6 is an Orange / Green wire - I am unsure what this is for too ...

It's another connection to "telephone audio".

... the MG Rover Workshop Manual ... PDF'd line wiring diagrams don't seem to show this connector / wires either.

You're right Martin, the wiring diagrams for the Symphony audio don't show the telephone connections. I found the information from RAVE's System Description for the Symphony audio system. They are shown on the Telecommunication wiring diagrams where they both connect to "Interface - Cellular Communications".

Anyway, you can safely ignore them!

Simon

[Oldmowgli]

Thanks Simon,
just out of interest, what or where is RAVE ? (R = Rover I guess ?)
Lots to learn...

Martin

[raykay]

As above, the Yellow connector was intended for a fitted phone unit, which never made it to production. The green connector is for the LowLine navigation system. The Blue connector is for the fitted CD changer.

You won't need any of them - the CD changer linked to the Symphony will not work with an aftermarket stereo as it uses the K-Bus (data circuit) to communicate with the Symphony. Aftermarket stereo/CD changers need connecting together by cable.

[SD1too]

Originally Posted by Oldmowgli

just out of interest, what or where is RAVE ?

I assume it's an acronym but I don't know what it stands for. It's the official MG Rover workshop manual, system description and operation, wiring diagrams, etc. all originally issued on a CD ROM to dealers.

Simon

[suzublu]

Originally Posted by SD1too

I assume it's an acronym but I don't know what it stands for. It's the official MG Rover workshop manual, system description and operation, wiring diagrams, etc. all originally issued on a CD ROM to dealers.



Simon

Rover Advanced Viewing Environment 😎

Sent from my SM-A326B using Tapatalk

[xsport]

Originally Posted by Oldmowgli

Thanks Simon,
just out of interest, what or where is RAVE ? (R = Rover I guess ?)
Lots to learn...

Martin

you can get a copy (cd) from rimmer bros. buy online from website. not expensive , very good value really.

[SD1too]

Originally Posted by suzublu

Rover Advanced Viewing Environment 😎

You are a font of knowledge Ron!

It's a bit contrived though isn't it.

Simon

[Oldmowgli]

Originally Posted by raykay

As above, the Yellow connector was intended for a fitted phone unit, which never made it to production. The green connector is for the LowLine navigation system. The Blue connector is for the fitted CD changer.

You won't need any of them - the CD changer linked to the Symphony will not work with an aftermarket stereo as it uses the K-Bus (data circuit) to communicate with the Symphony. Aftermarket stereo/CD changers need connecting together by cable.

Hi Ray,
thanks for the note re: yellow connector. The non fitted phone unit sounds about right....!

Regarding the CD Changer can you clarify whether you are saying that the Old CD autochanger will not communicate at all with a modern aftermarket head, or just that to get it working I will have to connect it via a new cable and not via the K-Bus circuit ?

I have been naively assuming that I can connect input wires via an aux connector on the new head.

Thanks again,

Martin

[raykay]

The CD player connected to the Symphony uses the K-Bus to communicate, which aftermarket stereos and CD players can't. Their connection is direct by cable between the two, the blue connector and cables in it are not needed.