Z3 ignition switch wiring. Help please!

Pond

Zorg Guru (III)
British Zeds
Joined
Dec 26, 2016
Points
144
Location
Spaldingski, Lincs
Model of Z
Z3 project and E89 Z4
My ignition switch has 2 auxilliary cables, in addition to the four 'power' cables....ie live in, acc, run and start.
I am trying to find out what they do. I have trawled through every wiring diagram I can find, looked online, and found nothing. There is no reference to these cables on any wiring diagram (that I can find).
I know that they are attached to an internal 'normally-closed' switch in the electrical connector, as they have continuity with the ignition OFF. However, they break contact as soon as the ignition is turned to any other position.

I have been wracking my brains trying to think of something that would be powered from the ignition switch when the switch is OFF, but breaks power when the igntion is ON. I can't think of anything.

HELP! It's driving me mad!

Picture of the cables on the rear of the ignition connector (they are the red/green and grey/green ones. They look like they are on a common connection in the photos, but they are not.
IMG_9799.JPGIMG_9800.JPG
 

NZ00Z3

Zorg Guru (IV)
Supporter
New Zealand Zeds
Joined
Dec 9, 2014
Points
158
Location
Timaru, New Zealand
Model of Z
3.0L, 2.8L, 2.0L Z3 Roadsters
What is the build date of your Z3 (mm/yy). I need that information to pick the right set of wiring diagrams and have a look for you.
 

Pond

Zorg Guru (III)
British Zeds
Joined
Dec 26, 2016
Points
144
Location
Spaldingski, Lincs
Model of Z
Z3 project and E89 Z4
What is the build date of your Z3 (mm/yy). I need that information to pick the right set of wiring diagrams and have a look for you.
Nov 2000.
M54 3 litre (if that helps).
 

NZ00Z3

Zorg Guru (IV)
Supporter
New Zealand Zeds
Joined
Dec 9, 2014
Points
158
Location
Timaru, New Zealand
Model of Z
3.0L, 2.8L, 2.0L Z3 Roadsters
I've been through the Great Britain and North American wiring diagrams for your build date and can't find the extra ignition switch contacts.

Searched through the central locking and alarm systems too to see if they had an odd power supply. Nothing found.

Sorry can't be of any more help.
 

Pond

Zorg Guru (III)
British Zeds
Joined
Dec 26, 2016
Points
144
Location
Spaldingski, Lincs
Model of Z
Z3 project and E89 Z4
I've been through the Great Britain and North American wiring diagrams for your build date and can't find the extra ignition switch contacts.

Searched through the central locking and alarm systems too to see if they had an odd power supply. Nothing found.

Sorry can't be of any more help.
I have been there too, which I why I asked! Thanks anyway. :thumbsup:
 

Pond

Zorg Guru (III)
British Zeds
Joined
Dec 26, 2016
Points
144
Location
Spaldingski, Lincs
Model of Z
Z3 project and E89 Z4
I now have the answer to my question.
 

Mint

Zorg Expert (I)
Supporter
British Zeds
East Anglian Crew
Joined
Sep 23, 2012
Points
222
Location
Stafford
Model of Z
2.2 & 3.0 Sport
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