Test M

PINPOINT TEST M: THE TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - MANUAL CLIMATE CONTROL

Test M1:

Test M1-M3:

Test M3-M5:

Test M5-M7:

Test M7-M8:

Normal Operation
Under normal operation, the temperature blend door actuator receives ignition voltage through circuit 1003 (GY/YE) and ground through circuit 1205 (BK). As the temperature selection changes it varies the voltage on circuit 773 (DG/OG) to the temperature blend door actuator.

Possible Causes
- An open in circuit 1205 (BK), 1003 (GY/YE) or circuit 773 (DG/OG).
- A short to ground in circuit 773 (DG/OG).
- A short together in circuits 1003 (GY/YE) or 773 (DG/OG).
- Temperature control switch.
- Temperature blend door actuator.
- Stuck or bound linkage or door.