Battery Disconnect Precautions: Notes
WARNING: This page is about a different variant/trim than selected.
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:
After battery has been disconnected, readiness code for Electronic Control Module (ECM) must be re-generated. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.