General Information

General Information







Headlights with High Intensity Gas Discharge (HID) lamps

WARNING:
- HIGH VOLTAGE.
- Always disconnect negative (-) battery terminal prior to servicing any parts of the HID lamp system marked with the yellow "HIGH VOLTAGE!" symbol.
- After disconnecting battery, briefly turn headlights on and off in order discharge any residual voltage.
- The control modules for HID lamps must never be operated (headlights turned on) without an HID lamp.
- HID bulbs operate at high voltages and temperatures and must only be operated (headlights turned on) when installed in the headlight housing.

Before troubleshooting or servicing, technicians must be familiar with Bi-Xenon (HID) headlight function. Refer to the "Electrical System" section in "The Passat W8" Self Study Program (SSP) (Course Number 822203) to become familiar with applicable features and functions.

CAUTION:
Before beginning repairs on the electrical system:
- Obtain the anti-theft radio security code.
- Switch off all electrical consumers.
- Switch ignition off and remove ignition key.
- Disconnect negative (-) battery terminal.
- When disconnecting and reconnecting battery terminals, observe all applicable Notes and torque specifications, as well as instructions on performing OBD program and electrical system function checks.

NOTE:
- When removing and installing HID bulbs, always remove complete headlight assembly from vehicle.
- The HID lamp system uses an automatic vertical headlight aim control system that has On Board Diagnostic (OBD) capabilities
- Troubleshooting.
See VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System in mode "Guided Fault Finding".