On Board Computer Power Issue? 1999 Z3 2.8

Dbirwin

Newbie
Canadian Zeds
Joined
Feb 6, 2021
Messages
7
Location
Mississauga, Ontario Canada
Model of Z
2.8
Greetings All

I am the new owner of a very clean 1999 Z3 2.8 with 67,000 km bought from a friend who has owned it from new.

Two very minor issues which appear to be power related however in both cases the fuses appear to be fine.
1. On Board Computer is blank. The previous owner recalls it to be operational.
2. The side view mirrors to not appear to work via the switch in the drivers door.
I have recently had some work done on the car to certify it to local standards and address issues related to lack of use, brakes, calipers, rotors, coils, plugs etc. Some sensors and bushings.

Aside from fuses is there anything else I should be checking as the root of the problem. A common cause?

Help and insight welcome.
 

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t-tony

Zorg Expert (II)
Supporter
British Zeds
#ZedShed
Joined
Dec 31, 2013
Messages
39,856
Location
Torksey Lock,Lincoln, England
Model of Z
Z4 3.0 Auto
If the car has been standing for a long time and the mirror switches not used then I would remove the switch and give it a liberal dose of electrical contact cleaner while operating the switch and see what happens. Do the seat motors all work ok? These can be an issue when they have not been operated over a long spell.

Tony.
 

Dbirwin

Newbie
Canadian Zeds
Joined
Feb 6, 2021
Messages
7
Location
Mississauga, Ontario Canada
Model of Z
2.8
If the car has been standing for a long time and the mirror switches not used then I would remove the switch and give it a liberal dose of electrical contact cleaner while operating the switch and see what happens. Do the seat motors all work ok? These can be an issue when they have not been operated over a long spell.

Tony.
Hi Tony. Seats work perfectly. Tires may have a few flat spots but other than these two small issues the car is magnificent.
 

D R Oldfield

Zorg Addict
Supporter
British Zeds
Joined
Jul 1, 2018
Messages
222
Location
Barrow-in-Furness
Model of Z
2.8 and 1.9
Hi 1998 2.8 computer died when it was laid up for 12 month the display would only show four lines down the middle i had to replace it with a second hand one
 

NZ00Z3

Zorg Guru (III)
Supporter
New Zealand Zeds
Joined
Dec 9, 2014
Messages
904
Location
Timaru, New Zealand
Model of Z
3.0L, 2.0L Z3 Roadsters
Have you downloaded the wiring diagrams for your car yet? There are 6 North American versions that cover the production run for the Z3. Find your build date (month/year), then checkout the "Resources" section of this forum. In the blue bar right at the top of the page. On the second page you will find the wiring diagrams. The date range that they apply to is on the front page of each set of diagrams, bottom right.
 

Dbirwin

Newbie
Canadian Zeds
Joined
Feb 6, 2021
Messages
7
Location
Mississauga, Ontario Canada
Model of Z
2.8
Thanks for the input. Hopefully the OBC is not dead. I will access the diagrams and read the entrails. I am sure a flurry of questions will follow.
 

Kevin z

Regular Member
3rd Party Trader
Joined
Dec 21, 2020
Messages
12
If the car has been standing for a long time and the mirror switches not used then I would remove the switch and give it a liberal dose of electrical contact cleaner while operating the switch and see what happens. Do the seat motors all work ok? These can be an issue when they have not been operated over a long spell.

Tony.
Remove the computer and unplug it from rear allow 24 hours to mother warm and plug it back on it should resert
 
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