Electrical Power Supply - General; Control Module Memories; Supply Voltage Fault Entry; Test Drive After Connecting The Battery - Porsche Boxster 1999 Technical Manual

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Electrical power supply -general
Effect of disconnection or total dischar-
ge of the battery on electrical systems
in the vehicle, subsequent measures:
Control module memories:
Values and faults stored in the control modules
can be deleted if the battery is disconnected or
completely discharged.
1. Never disconnect battery with engine running.
2. Never start engine without securely connected
battery.
Remedy:
If possible, all fault memories should be
checked and, if necessary, printed out before
the battery is disconnected.
3. Do not use a boost charger to start the en-
gine.
Supply voltage fault entry:
4. Whenever possible, use jump leads with over-
voltage protection.
The entry "supply voltage" could be stored in va-
rious control modules if the battery has been
completely discharged.
5. Always disconnect the battery terminals be-
fore carrying out welding work on the vehicle,
6. Wiring harness plugs of control modules or
other electronic components must be con-
nected or disconnected with the ignition off.
Exception: vehicles with the additional
equipment M 536 (alarm siren with tilt sen-
sor).
Remedy:
Delete the "supply voltage" entry from the con-
trol modules in Question.
Test drive after connecting the battery:
The fault memories of all vehicle control mod-
ules should be read out again after the test dr~
ve.
Note concerning M 536:
In order to avoid triggering the alarm siren (in-
stalled next to the battery) of vehicles with M
536, the battery must be disconnected with the
ignition on (all loads must be switched off before-
hand),
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0 Electrical power supply -general
Printed in Germany -32, 1999
986O_49