B10A2

B10A2-LEFT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE

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

Theory of Operation

The A/C Heater Control monitors the door driver circuits during actuator operation for shorts to ground, shorts to battery, and shorts to other door driver circuits. If detected, the A/C Heater Control reports these types of faults as Control Circuit/Performance DTCs.

- When Monitored:
When actuator movement is requested.

- Set Condition:
If the A/C Heater Control detects a short to ground or to voltage on the (C32) Recirculation Door Driver, the (C33) Passenger Blend Door Driver, the (C61) Driver Blend Door Driver, the (C35) Mode Door Driver, or the (C807) Common Door Driver 2 circuits while attempting to drive the (C32) Recirculation Door Driver.





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 in the A/C Heater Control C1 harness connector.

Is the voltage below 0.2 of a volt?

Yes

- Go To 2

No

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

2. CHECK (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the voltage of the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the voltage below 0.2 of a volt?

Yes

- Go To 3

No

- Repair the (C33) Passenger Blend Door Driver circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK (C35) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage of the (C35) Mode Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the voltage below 0.2 of a volt?

Yes

- Go To 4

No

- Repair the (C35) Mode Door Driver circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK (C61) DRIVER BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the voltage of the (C61) Driver Blend Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the voltage below 0.2 of a volt?

Yes

- Go To 5

No

- Repair the (C61) Driver Blend Door Driver circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. CHECK (C807) COMMON DOOR DRIVER 2 CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage of the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.

Is the voltage below 0.2 of a volt?

Yes

- Go To 6

No

- Repair the (C807) Common Door Driver 2 circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

6. CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Measure the resistance between ground and the (C32) Recirculation Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance above 10k Ohms?

Yes

- Go To 7

No

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

7. CHECK (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance above 10k Ohms?

Yes

- Go To 8

No

- Repair the (C33) Passenger Blend Door Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

8. CHECK (C61) DRIVER BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance between ground and the (C61) Driver Blend Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance above 10k Ohms?

Yes

- Go To 9

No

- Repair the (C61) Driver Blend Door Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

9. CHECK (C35) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (C35) Mode Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance above 10k Ohms?

Yes

- Go To 10

No

- Repair the (C35) Mode Door Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

10. CHECK (C807) COMMON DOOR DRIVER 2 CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.

Is the resistance above 10k Ohms?

Yes

- Go To 11

No

- Repair the (C807) Common Door Driver 2 circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

11. CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS
1. Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C33) Passenger Blend Door Driver circuit, (C61) Driver Blend Door Driver circuit, the (C807) Common Door Driver 2 circuit, and the (C35) Mode Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance above 100 Ohms between the (C32) Recirculation Door Driver circuit and all door driver circuits?

Yes

- Go To 12

No

- Repair the circuit(s) with a resistance below 100 Ohms for a short to the (C32) Recirculation Door Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

12. CHECK RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE




1. Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.

Is the resistance between 30 and 40 Ohms?

Yes

- Go To 13

No

- Replace the Recirculation Door Actuator.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

13. CHECK PASSENGER BLEND DOOR ACTUATOR CIRCUIT RESISTANCE




1. Measure the resistance between the (C33) Passenger Blend Door Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.

Is the resistance between 30 and 40 Ohms?

Yes

- Go To 14

No

- Replace the Passenger Door Actuator.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

14. CHECK MODE DOOR ACTUATOR CIRCUIT RESISTANCE
1. Measure the resistance between the (C35) Mode Door Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.

Is the resistance between 30 and 40 Ohms?

Yes

- Go To 15

No

- Replace the Mode Door Actuator.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

15. CHECK DRIVER BLEND DOOR ACTUATOR CIRCUIT RESISTANCE




1. Measure the resistance between the (C61) Driver Blend Door Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.

Is the resistance between 30 and 40 Ohms?

Yes

- Go To 16

No

- Replace the Mode Door Actuator.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

16. RUN THE ACTUATOR CALIBRATION TEST
1. Reconnect the A/C Heater Control C1 harness connector.
2. Turn the ignition on.
3. With the scan tool, erase HVAC DTCs.
4. Turn the ignition off, wait 10 seconds, and then turn the ignition on.
5. With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs.

Does the scan tool only display: B1058-RECIRCULATION DOOR CONTROL CIRCUIT/PERFORMANCE?

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).

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.