For 1990-2009 cars

Mode Setting | Mode Motor
--- | ---
Connector Terminal
Controller/Motor | Controller/Motor | Controller/Motor | Controller/Motor | Controller/Motor
B16/3 | B17/2 | B18/1 | B19/7 | B20/6
Vent | 11-14 V | 11-14 V | 11-14 V | 11-14 V | 0 V
Bi-Level | 11-14 V | 11-14 V | 11-14 V | 0 V | 11-14 V
Foot | 11-14 V | 11-14 V | 0 V | 11-14 V | 11-14 V
Foot/Defrost | 11-14 V | 0 V | 11-14 V | 11-14 V | 11-14 V
Defrost | 0 V | 11-14 V | 11-14 V | 11-14 V | 11-14 V