8 Mode switch Function Of Buttons (Manual) 1. Mode operation - MAX A/C : VENT, REC, A/C ON - VENT mode : VENT - B/L mode : B/L - FLOOR mode : FLOOR, FRE - MIX mode : MIX, FRE, A/C ON - DEF mode : DEF, FRE, A/C ON 2. Feedback voltage of mode actuator 