Blend Calibration Fault

BLEND CALIBRATION FAULT





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

- When Monitored:
When the HVAC Door Recalibration is executed.

- Set Condition:
If the blend door's span is found outside the tolerance due to: open door actuator electrical circuits; a bad door actuator; broken door linkage; a bound up door; door actuator electrical circuits shorted to voltage; door actuator electrical circuits shorted to ground. A short to voltage or ground on the door actuator electrical circuits will also set door actuator overcurrent faults.





1. CHECK FOR ACTUATOR CIRCUIT TEST FAULT MESSAGES

NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired before diagnosing Calibration fault messages.

1. Turn the ignition on.
2. With the scan tool perform the Actuator Circuit Test.

Does the scan tool display any Actuator Circuit Test fault messages?

Yes

- Diagnose and repair the DTC(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To 2

2. CHECK FOR HVAC DTCS

NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired before diagnosing Calibration fault messages.

1. Turn the ignition on.
2. With the scan tool, read HVAC DTCs.

Does the scan tool display any HVAC DTCs?

Yes

- Diagnose and repair the DTC(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To 3

3. CHECK APPLICABLE DOOR ACTUATOR CIRCUIT
1. Turn the ignition off.
2. Disconnect the A/C - Heater Control Module C2 harness connector.
3. Measure the resistance between the Common Door Driver circuit and the applicable door driver circuit.

Is the resistance above 70.0 ohms?

Yes

- Go To 4

No

- Go To 6

4. DOOR ACTUATOR DRIVER CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the A/C - Heater Control Module C2 harness connector.
3. Disconnect the applicable door actuator harness connector.
4. Measure the resistance of the applicable door driver circuit between the A/C - Heater Control Module C2 harness connector and the door actuator harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the applicable door driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

5. COMMON DOOR DRIVER CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the A/C - Heater Control Module C2 harness connector.
3. Disconnect the applicable door actuator harness connector.
4. Measure the resistance of the Common Door Driver circuit between the applicable door actuator harness connector and the A/C - Heater Control Module C2 harness connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the applicable door actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Repair the Common Door Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

6. DOOR ACTUATOR/LINKAGE/DOOR
1. Turn the ignition off.
2. Remove the applicable door actuator from the A/C - Heater Housing Assembly.
3. Disconnect the door actuator harness connector.
4. By hand, attempt to rotate the door actuator in both directions.
5. Inspect the A/C - Heater Housing Assembly for missing and broken actuator linkage.
6. Inspect the linkage and the actuator for broken and missing teeth.
7. Check the doors for binding and loss of full range.

Is the door actuator, the linkage, and the door in good condition and functioning correctly?

Yes

- Replace the A/C - Heater Control Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.