General information: Notes

WARNING: This page is about a different car, the 2004 Audi S4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Before beginning repairs on the electrical system:

Obtain anti-theft radio security code if necessary.
Switch the ignition off.
Disconnect battery Ground (GND) strap.
On vehicles equipped with Audi Telematics by OnStar(R), switch-off the emergency (back-up) battery for the Telematic/Telephone Control Module prior to disconnecting vehicle battery. Use VAS 5051 Vehicle Diagnostic, Testing and Information System in mode "Guided Fault Finding". See EMERGENCY BATTERY, SWITCHING OFF/ON .
After reconnecting vehicle battery. re-code anti-theft radio if necessary, and check operation. Also check operation of clock and power windows according to Repair Manual and/or Owner's Manual.
After reconnecting vehicle battery on vehicles equipped with Audi Telematics by OnStar(R), switch-on the emergency (back-up) battery for the Telematic/Telephone Control Module. Use VAS 5051 Vehicle Diagnostic, Testing and Information System in mode "Guided Fault Finding". See EMERGENCY BATTERY, SWITCHING OFF/ON .

NOTE: Further measures after reconnecting the voltage supply:

See PROCEDURE AFTER INTERRUPTION OF VOLTAGE SUPPLY (1.8L), or PROCEDURE FOLLOWING INTERRUPTION OF VOLTAGE SUPPLY (3.0L).

Before troubleshooting or servicing, technicians must be familiar with all telematics functions, operating specifics and the particular service plan which the customer subscribes to. Refer to AUDI TELEMATICS BY ONSTAR(R) "Self Study Program (SSP) and "Audi Telematics by OnStar(R) Owner's Manual and/or OnStar(R) "Quick Reference Guide" to become familiar with applicable features and functions.