On Board Computer Power Issue? 1999 Z3 2.8

Dbirwin

Newbie
Canadian Zeds
Joined
Feb 6, 2021
Points
3
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)
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British Zeds
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Dec 31, 2013
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Torksey Lock,Lincoln, England
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E89 Z4 23i 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
Points
3
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 Guru (I)
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British Zeds
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Jul 1, 2018
Points
99
Location
Barrow-in-Furness
Model of Z
2.8
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

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New Zealand Zeds
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Dec 9, 2014
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Location
Timaru, New Zealand
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3.0L, 2.8L, 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
Points
3
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
Points
13
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
 

andyglym

Shiny Dust Caps Make Your Zed Go Faster.
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British Zeds
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Feb 20, 2015
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Location
Moresby, West Cumbria, England
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2.8 Roadster
Ref the mirrors, it could be the case that the mirror wires have not been reconnected when removed at some point.
 

Mint

Zorg Expert (I)
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Stafford
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Holy thread ressurection BatMan=)). The OP hasn't been on the forum for over a year. I don't think we'll hear what the solution was:whistle:=))
 
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