Test L: No Operation In All Temperature Settings - Manual Climate Control

PINPOINT TEST L: NO OPERATION IN ALL TEMPERATURE SETTINGS - MANUAL CLIMATE CONTROL

L1:

L1-L3:

L4-L5:

L6-L7:

L8-L10:

L10-L11:

Normal Operation
Under normal operation, the temperature blend door actuator is supplied voltage on circuit 1087 (OG) 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
- An open, short to voltage, ground or together in circuits 57 (BK), 436 (RD/LG), 437 (YE/LG), 438 (RD/WH) or 1087 (OG)
- Temperature blend door actuator.
- Temperature control potentiometer
- Stuck or bound linkage or door