Preparatory steps

Connect VAG 1551 scan tool and press buttons -0- and -8- to insert AC/Heating Electronics" address word 08 and advance program until "Select function XX" appears on display. See ON BOARD DIAGNOSTIC (OBD), INITIATING .
Carry out basic setting and check coding. See BASIC SETTING (FUNCTION 04) and ON BOARD DIAGNOSTIC (OBD), INITIATING .
Close hood and sunroof.
Measure ambient temperature.
Close doors and windows.