BMW 3 1992 Service Manual page 8

Please read these warnings and cautions
before proceeding with maintenance and repair work.
CAUTION-
" See also Warnings on page vi¡ " Before doing any electrical welding on cars equipped with ABS,
disconnect the battery negative (-) terminal (ground strap) and the
" If you lack the skills, tools and equipment, or a suitable work-
ABS control unit connector.
shop for any procedure described in this manual, we suggest you
leave such repairs to an authorized BMW dealer or other qualified " On cars equipped with anti-theft radios, make sure you know the
shop.
correct radio activation code before disconnecting the battery or
removing the radio. lf the wrong code is entered into the radio
" BMW is constantly improving its cars and sometimes these
when power is restored, that radio may lock up and be rendered
changes, both in parts and specifications, are made applicable to
inoperable, even if the correct code is then entered .
earlier models. Therefore, part numbers listed in this manual are
for reference only. Always check with your authorized BMW dealer
" Always make sure ignition is off before disconnecting battery.
parts department for the latest information .
" Label battery cables before disconnecting . On some models,
" Before starting a job, make certain that you have all the neces- battery cables are not color coded .
sary tools and parts on hand . Read al¡ the instructions thoroughly,
do not attempt shortcuts . Use tools appropriate to the work and
" Disconnecting the battery may erase fault code(s) stored in con-
use only replacement parts meeting BMW specifications . Make-
trol module memory Using special BMW diagnostíc equipment,
shift tools, parts and procedures will not make good repairs .
check for faultcodes prior to disconnecting the battery cables. Ifthe
Check Engine light is illuminated, see 100 Engine-General for
" Use pneumatic and electric tools only to loosen threaded parts
On-Board Diagnostics (OBD) fault code information . lf any other
and fasteners . Never use these tools to tighten fasteners, espe-
system faults have been detected (indicated by an ílluminated
cially on light alloy parts. Always use a torque wrench to tighten
warning light), see an authorized BMW dealer.
fasteners to the tightening torque specification listed .
" If a normal or rapid charger is used to charge battery, the battery
" Be mindful of the environment and ecology. Before you drain the
must be disconnected and removed from the vehicle in order to
crankcase, find out the proper way to dispose of the oil . Do not
avoid damaging paint and upholstery
pour oil onto the ground, down a drain, or into a stream, pond or
lake . Dispose of in accordance with Federal, State and Local laws. " Do not quick-charge the battery (for boost starting) for longer
than one minute . Wait at least one minute before boosting the bat-
e
If battery power is lost or the battery has been disconnected, the
tery a second time .
power windows must be re-initialized . Both one touch up/down
and pinch-protection will be inactive until windows are re-initial-
" Connect and disconnect a battery charger only with the battery
ized . See 512 Door Windows .
charger switched off.
" The control module for the anti-lock brake system (ABS) cannot
withstand temperatures from a paint-drying booth or a heat lamp
in excess of 203°F (95°C) and should not be subjected to temper-
atures in excess of 185°F (85°C) for more than two hours .
" Sealed or "maintenance free" batteries should be slow-charged
only, at an amperage rate that is approximately 10% of the bat-
tery's ampere-hour (Ah) rating .
" Do not allow battery charging voltage to exceed 16 .5 volts. If the
battery begins producing gas or boiling violently, reduce the charg-
ing rate . Boosting a sulfated battery at a high charging rate can
cause an explosion .