DTC B3779 Chevrolet Silverado 2500 HD

This DTC is for the mode actuator.

Conditions for Running the DTC

1. The ignition is ON.
2. Ignition voltage is between 9-16 volts.
3. The HVAC module is ON.

Conditions for Setting the DTC

The actual door position differs from the commanded door position by more than 4 counts or the HVAC control module detects the door position signal circuit is less than 7 counts or greater than 250 counts.

Action Taken When the DTC Sets

The control circuit is deactivated for the appropriate actuator.

Conditions for Clearing the DTC

1. The DTC becomes history when the HVAC control module no longer detects the condition that set the DTC.
2. The history DTC will clear after 50 fault-free ignition cycles.
3. The DTC can be cleared with a scan tool.

Reference Information

Schematic Reference

HVAC Schematics

Connector End View Reference

HVAC Connector End Views

Description and Operation

1. «Air Delivery Description and Operation»(ref-277997-S21943014992008012100000)
2. «Air Temperature Description and Operation»(ref-277997-S19219715292008012100000)

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Connector Repairs»(ref-278019-S06982211772008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

Scan Tool Reference

1. «Scan Tool Output Controls»(ref-277997-S27681403182008012100000)
2. «Scan Tool Data List»(ref-277997-S08857823782008012100000)
3. «Scan Tool Data Definitions»(ref-277997-S06825792862008012100000)