GM Service Manual Online
For 1990-2009 cars only

Mode Setting

Mode Motor

HTR/DEF Motor

 

Connector Terminal

Controller/Motor

Controller/Motor

Controller/Motor

Controller/Motor

Controller/Motor

Controller/Motor

B20/3

B19/2

B18/1

B17/2

B16/1

B15/7

Vent

11-14 V

11-14 V

0 V

0 V

11-14 V

11-14 V

Bi-Level

11-14 V

0 V

11-14 V

11-14 V

11-14 V

0 V

Foot

0 V

11-14 V

11-14 V

11-14 V

11-14 V

0 V

Foot/Defrost

0 V

11-14 V

11-14 V

0 V

11-14 V

11-14 V

Defrost

0 V

11-14 V

11-14 V

0 V

11-14 V

11-14 V