Service Hints

A4 A/C DUAL PRESSURE SW
1-4 : Open with the refrigerant pressure at less than approx. 2.0 kg/Sq.cm (31 psi, 196 kpa) or more than approx. 32 kg/Sq.cm (455 psi, 3138 kpa)

C12-A, C13-B, C14-C A/C ECU [COMB. METER ECU]
B-GROUND : Always approx. 12 volts
B2-GROUND : Always approx. 12 volts
AIF-GROUND : Approx. 12 volts with the FRESH SW on
AIR-GROUND : Approx. 12 volts with the RECIRC SW on
E2-GROUND : Always continuity