HVAC - Single Zone

B105A-RECIRCULATION DOOR CONTROL CIRCUIT HIGH (SINGLE-ZONE)





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

Theory of Operation

The A/C Heater Control drives the Recirculation Door Actuator via the (C32) Recirculation Door Driver circuit and the (C34) Common Door Driver circuit. All of the door actuators share the (C34) Common Door Driver circuit. Inside the A/C Heater Control, each door actuator has its own unique driver, but all share a single common door driver circuit. Due to the shared circuitry similar DTCs can set at the same time for multiple actuators depending upon the type of short, its location, and the direction the actuator is moving when the short is present.

- When Monitored:
When the Actuator DTC Detection Test is executed.

- Set Condition:
If the (C32) Recirculation Door Driver circuit is shorted to voltage.





1. CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the A/C Heater Control C1 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C32) Recirculation Door Driver circuit.

Is the voltage above 0.2 of a volt?

Yes

- Repair the (C32) Recirculation Door Driver circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 2

2. RUN THE ACTUATOR DTC DETECTION TEST
1. Turn the ignition off.
2. Reconnect the A/C Heater Control C1 harness connector.
3. Turn the ignition on.
4. With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs.

Does the scan tool only display: B105A-RECIRCULATION DOOR CONTROL CIRCUIT HIGH?

Yes

- Replace the A/C Heater Control.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No, Other DTC(s) Displayed

- Diagnose and repair the other DTC(s). If multiple DTCs are present, beginning with the common circuit, diagnose and repair all short high DTCs and then all short low DTCs.

No, And No Other DTCs Displayed

- Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short. Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.