Test L: Temperature Control Is Inoperative/Does Not Operate Correctly - Manual Climate Control

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

L1-L2:

L2-L4:

L4-L5:

L6-L8:

L8-L10:

L11:

Normal Operation
Under normal operation, the temperature blend door actuator is supplied voltage on circuit 296 (WH/VT) and ground on circuit 57 (BK). As the temperature selection changes it varies the voltage on circuit 437 (YE/LG) to the temperature blend door actuator. The temperature control potentiometer receives reference voltage from the temperature blend door actuator through circuit 436 (RD/LG). Ground for the temperature control potentiometer is supplied from the temperature blend door actuator through circuit 438 (RD/WH).

Possible Causes
- Fuse
- An open, short to voltage, ground or together in circuits 57 (BK), 296 (WH/VT), 436 (RD/LG), 437 (YE/LG) or 438 (RD/WH)
- Temperature blend door actuator
- Temperature control potentiometer
- Stuck or bound linkage or door