Connect diagnostic tester: Requirements

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2005 Volkswagen Jetta, 2004 Volkswagen Jetta, 2003 Volkswagen Jetta, 2003 Volkswagen Golf, and 2002 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

The respective fuses of the Motronic fuel injection and ignition system must be OK.

Fig 1: Identifying Fuses

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Battery voltage must be at least 11.5 volts.
All electrical consumers like, for example, lights and rear window heating must be switched off.
Parking brake must be engaged or else daylight driving lights will be switched on.
For vehicles with automatic transmission, selector lever must be in position -P- or -N-.

NOTE: Fuse block is located behind access panel at far left end of dash.

If vehicle is equipped with an A/C system, it must be switched off.
Ground (GND) connections between engine and chassis must be OK.
Ignition switched off.