[SNIP]
Jeg modtog en mail fra Per, med en del information om emnet, blandt andet en
bekræftigelse af at grunden til mine problemer med målerne godt kan have
været batterierne:
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Hej Casper
Kan se du har haft lidt problemer med SI batterierne.
For det 1. Det ER opladelige batterier NiCad der skal i, de skal "gemme"
info om serviceintervallerne.
Desuden vil der opstå fejl på Omdrejningstæller, Tempmåler, Økonometer hvis
batterier er dårlige. De indgår i et kredsløb på mainboardet.
Man kan købe disse batt. med loddeflige hos bl.a radioparts, farnell osv.
De skal lades op før montering!
For det 2. er det ganske nemt at afmontere instrumenthuset og skifte disse
batt. tager ikke mere end ca. 1 time.
Når du nu har fået "nyt" instrumenthus i, så skal du lige sikre dig at den
lille hvide kodenøgle er samme type som i det gamle hus, ellers vil
speedometeret ikke regne rigtigt.
E30´eren har elektronisk speedometer, får et signal fra bagtøjet som så
oversættes i kodenøgle.
Håber det kan hjælpe dig lidt
Vil helst ikke tage stilling til hvem der har skiftet eller hvor dyrt det
har været for dig!
Mvh
Per
Søgte på "bmw si battery" på google
Si (service interval) board problems: pre-1990 BMWs (NiCad Batteries)
(Note: The subject of this page has nothing to do with our tools- the
reset/scan tool does not require batteries.)
By far the most common problem with the BMW service lights, and instrument
cluster in general, is the si board: a printed circuit board located inside
the cars instrument housing which controls, among other things, the
operation of your service interval lights. The Si board is what decides how
often your Si lights come on. It is a simple computer which monitors your
driving conditions and keeps tabs on how far you've gone and how well you
have behaved in respect to RPM and engine temp. In order for it to remember
this accumulated "tab" while the engine is starting (a time in which it is
starved of power; as all power is directed to starting the engine) it must
have a back up power source, just like the "CMOS" batteries in a typical PC.
Batteries, as you know, eventually die. In the case of the typical BMW si
board batteries, one should expect a battery life span of no more than five
years- little as two, as much as eight years. It depends on your local
average climate (We sell a lot of batteries into Florida, Arizona etc...)..
SYMPTOMS: Depending on the model of the BMW a dead Si board can cause other
problems such as erratic gauges. But, by far the most common symptom of Si
battery failure is the appearance of the "Inspection" light shortly after a
reset- It could be just a few minutes, or even a day later. Other
indications include non-response to a reset, lights stay on while car is off
with no key in the ignition, lights never come on, improper green-yellow-red
led sequence in respect to the Oilservice and Inspection intervals, si light
flashing, and on certain models, gauge problems.
REPLACEMENT PROCEDURE: Replacing your Si batteries is not particularly
difficult, but it is time consuming (90-180 minutes). It requires that you
have a soldering iron and basic hand tools, and more importantly, you know
how to use them. The majority of the time to do the job is consumed in
removing the instrument cluster and dismantling it, especially on the 3
series. Fortunately, steering wheel removal is not necessary on most models.
Our Si battery replacement kit includes instruction on doing the procedure,
though one should note that the photographic and procedural subjects in our
replacement battery kit ($24.95 part number SIBN) consist of a 1984 318i, a
1985 528e, and a 1986 635csi, so you, depending on the year and model of
your BMW, may have to improvise.
YOUR CAR HAS AN AIRBAG: Unfortunately, there is no SI battery replacement
kit available for SRS (airbag) equipped cars.
BAD PC BOARD: It happens. Sometimes you just need a new board. Contact ECMS
for replacement PCB's and control modules for your BMW at a savings over the
cost of a new factory "fresh" board. They can be reached at (570) 883 9930,
or 1-800-687-3267, please tell them we sent you.