Porsche Boxster Technical Manual page 24

Boxster (98G)
Body
Electronic control modules
rn Note!
Protection against overvoltage
To protect electronic control units from overvoltage during electric
arc welding, the following work regulations must be observed:
.When welding work is extensive, the electronic control units
must be removed. Ensure that there are no electrically insulated
parts between the earth connection and the welding point.
.Remove clamp from negative terminal of battery and cover neg-
ative terminal of battery.
.Connect the earth connection of the electric arc welding equip-
ment as near as possible to the welding point on the part to be
welded.
.Do not touch electronic control units or electric cables with the
earth connection or the welding electrode.
Replacing control
The replacement of electronic control modules after an accident is
necessary if at least one of the following conditions is met:
.The housing is noticeably deformed or damaged.
.The supporting surface or bracket is deformed (the unit shows
no external damage).
.The plug connection is damaged or corroded by moisture.
.Functional checks on or self-diagnosis of the unit reveals the
fault "Control module faulty".
If electronic components, e.g. ABS control module, have been
removed for repair work and are then reused, they must be given a
functional check after installation in accordance with the existing
specifications!