Volkswagen Passat 1995 Official Factory Repair Manual page 2248

General information for On Board Diagnostic (OBD)
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU08.ST.1
Diagnostic tester, connecting
Recommended special tools and equipment
VAS5052 Vehicle Diagnostic and Information
System with
VAS 5052/3 diagnostic cable
Requirements
The respective fuses of the Motronic fuel injection
and ignition system must be OK:
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Battery voltage must be at least 11.5 Volts.
All electrical consumers such as, lights and rear
window defroster must be switched off.
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12/6/2004