Test requirements

The fuses must be OK.
NOTE: Fuse holder is located behind access panel at far left end of dash.

Fig 1: Identifying Fuses

Courtesy of VOLKSWAGEN OF AMERICA, INC.

The battery voltage must be at least 11.5 V.
All electrical accessories, e.g. lights and rear window defroster must be switched off.
If the vehicle is equipped with air conditioning, it must be turned off.
Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
Knock sensor malfunction detected by On Board Diagnostic (OBD). See DTC MEMORY .
The signal from brake light switch and brake pedal switch must be OK, Checking. See BRAKE LIGHT SWITCH -F- AND BRAKE PEDAL SWITCH (CRUISE CONTROL/DIESEL DIRECT FUEL INJECTION) -F47- SIGNAL, CHECKING .
Engine Coolant Temperature (ECT) must be at least 85 °C, display group 28, display zone 3.