General Information - From 11.04

General Information - From 11.04

CAUTION:
- HIGH VOLTAGE!
- Always disconnect negative (-) battery terminal prior to working on parts of HID headlamp components marked with yellow "HIGH VOLTAGE" warning symbols.
- The physical and mechanical properties of HID bulbs are very sensitive. Internal pressure of HID glass bulb may exceed 100 bar (in operation). Bulb temperature may exceed 700 degrees Celsius.
- Danger of explosion and burning.
- The control modules for HID lamps must never be operated (headlamps turned on) without an HID lamp.
- HID bulbs must only be operated (headlamps turned on) when installed in the headlamp housing.
- Always wear safety glasses and gloves when removing and installing HID bulb.
- Never look directly at an operating HID bulb. The UV emissions of an HID bulb are approximately 2.5 times that of a comparable halogen bulb.

Before troubleshooting or servicing, technicians must be familiar with the functions and operation specifics of the standard or optional headlamp or lighting system. Always read the owners manual and review applicable system functions.

NOTE:
- Additional information:
Owners Manual
Self Study Program - Course Number 991503 "The 2005 Audi A4"
Wiring Diagrams Component Locations

CAUTION:
Before beginning repairs on electrical system
- Switch off all electrical consumers.
- Switch ignition off and remove ignition key.