Battery Disconnect Precautions: Notes
WARNING: This page is about a different car, the 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 disconnecting negative battery terminal, turn ignition switch to OFF position and obtain anti-theft radio security code. On vehicles equipped with Audi Telematics by OnStar, switch-off the emergency (back-up) battery for the Telematic/Telephone Control Module prior to disconnecting vehicle battery. See ONSTAR® EMERGENCY BATTERY (AUDI TELEMATICS) .
After reconnecting vehicle battery, re-code and check operation of anti-theft radio. Also check operation of clock. Fully close power windows to window stop, then activate all power window switches ("up") for at least a second to activate automatic window raising/lowering. power windows.
If connector is disconnected from ECM or the battery is disconnected, all adaptation values in control module are erased. DTC memory content will remain intact however. If engine is started after this, a rough, uneven idle can result. In this case, engine must be allowed to run at idle for a few minutes or a longer road test must be performed until adaptation procedure has been completed.
NOTE:
Vehicles with On Board Diagnostics (OBD) II must have readiness code for Electronic Control Module (ECM) re-generated after battery has been disconnected. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.