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B1058-92






B1058-92-RECIRCULATION DOOR CONTROL - PERFORMANCE OR INCORRECT OPERATION





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

Theory of Operation

After the initial installation of the A/C Heater Module, the controller is calibrated to each individual blend/mode door actuator. These calibrations are stored as in the number of pulses it takes to move the door from one stop to another. The A/C Heater Module drives the Door Actuators by the use of Door Driver circuit and a Common Door Driver circuit and monitors all door actuator pulses to detect door movement in both directions. Most of the door actuators share a common door driver circuit but each door actuator has its own unique driver circuit. Due to shared circuitry, similar Diagnostic Trouble Codes (DTCs) can set at the same time for multiple actuators depending upon the type of circuit malfunction, its location, and the direction the actuator is moving when the malfunction is present. For further informationHeating And Air Conditioning - Description.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The A/C Heater Module detects no feedback pulses on the Recirculation Door Control circuits for 15 seconds or more. If the A/C Heater Module detects a valid feedback pulse, the DTC will change from Active to Stored and will stay in the controllers memory for 100 ignition cycles.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. CHECK IF DTC IS ACTIVE
1. Ignition on, engine not running.
2. Using the scan tool, read HVAC DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Go To 9

2. PERFORM HVAC ACTUATOR CALIBRATION TEST
1. Using the scan tool, perform the HVAC Actuator Calibration Test.

Did any other HVAC DTCs set while performing the Actuator Calibration Test?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 3

3. CHECK THE (C32/C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off to the lock position.
2. Disconnect the A/C Heater Module C1 harness connector.
3. Disconnect the Recirculation Door Actuator harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (C32/C268) Recirculation Door Driver circuit.

Is there any voltage present?

Yes

- Repair the (C32/C268) Recirculation Door Driver circuit for a short to voltage.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 4

4. CHECK THE (C34/C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the voltage of the (C34/C68) Recirculation Door Common Driver circuit.

Is there any voltage present?

Yes

- Repair the (C34/C68) Recirculation Door Common Driver circuit for a short to voltage.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 5

5. CHECK THE (C32/C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off to the lock position.
2. Measure the resistance between ground and the (C32/C268) Recirculation Door Driver circuit.

Is the resistance below 100k Ohms?

Yes

- Repair the (C32/C268) Recirculation Door Driver circuit for a short to ground.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 6

6. CHECK THE (C34/C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance between ground and the (C34/C68) Recirculation Door Common Driver circuit.

Is the resistance below 100k Ohms?

Yes

- Repair the (C34/C68) Recirculation Door Common Driver circuit for a short to ground.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 7

7. CHECK THE RECIRCULATION DOOR
1. Remove the Recirculation Door Actuator and check the Recirculation Door for binding and full travel. Recirculation Door Actuator - Removal.

Were there any problems found?

Yes

- Repair or replace the Recirculation Door as necessary. HVAC Housing - Removal.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 8

8. CHECK THE RECIRCULATION DOOR ACTUATOR
1. Replace the Recirculation Door Actuator. Recirculation Door Actuator - Removal.
2. Using the scan tool, erase HVAC DTCs and perform the HVAC Actuator Calibration Test.

Did this DTC reset?

Yes

- Replace and program the A/C Heater Module. A/C And Heater Control Module - Removal.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

9. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Wiggle the wiring and connectors while checking for shorted and open circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.

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