B0413

Schematic:

CIRCUIT DESCRIPTION
The HVAC control module receives a position signal from the air temperature actuator. The air temperature actuator position sensor is a potentiometer that is tied up to a 5 V reference source. The variable output from the potentiometer feeds back a position signal to a pull-up resistor which is located in the HVAC control module. This signal determines the necessary drive signal to the actuator motor, which provides the proper air temperature door position. This value is stored in the KEEP ALIVE memory portion of the HVAC control module.

DTC PARAMETERS
^ Ignition in RUN position
^ RED circuit 130 shorted to ground, voltage or open
^ WHT circuit 733 shorted to voltage ground or open
^ Open grounds circuit 550 BLK/WHT

DIAGNOSTIC AIDS
If DTC in history or an intermittent condition, perform the test shown by wiggling wiring and connectors. This will cause malfunction to appear.

Visually inspect sensor connector and harness for damage, corrosion or water intrusion.

Check connector halves for poor mating or terminal not fully seated in the connector body (backed out).

Check for adequate terminal tension, mis-routed harness, rubbed-through wire insulation and broken wire inside the insulation.

Check for improperly formed or damaged terminals. All connector terminals in the related circuit should be carefully reformed or replaced to ensure proper contact tension.

TEST

Diagnostic Chart: