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B10A2






B10A2-LEFT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (ATC)





For a complete wiring diagram Refer to Diagrams/Electrical.

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 an excessive current draw on any of the door driver circuits while attempting to drive this door actuator.





NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. HVAC System Test (ATC)

Diagnostic Test

1.CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO VOLTAGE





Turn the ignition off.

Disconnect the A/C Heater Control C2 harness connector.

Turn the ignition on.

Measure the voltage of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

Is the voltage above 0.2 volts on any of the circuits?

Yes

- Repair all circuits with voltage above 0.2 volts for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 2

2.CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO GROUND





Turn the ignition off.

Measure the resistance of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit between ground and the A/C Heater Control C2 harness connector.

Is the resistance below 10k ohms on any of the circuits?

Yes

- Repair all circuits with a resistance below 10k ohms for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3.CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT





Measure the resistance between the (C266) Mode Door Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

Is the resistance below 10k ohms on any of the circuits?

Yes

- Repair all circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 4

4.CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT





Measure the resistance between the (C66) Mode Door Common Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

Is the resistance below 10k ohms on any of the circuits?

Yes

- Repair all circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Common Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 5

5.CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT





Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

Is the resistance below 10k ohms on any of the circuits?

Yes

- Repair all circuits with a resistance below 10k ohms for a short to (C255) Left Blend Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 6

6.CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT





Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

Is the resistance below 10k ohms on any of the circuits?

Yes

- Repair all circuits with a resistance below 10k ohms for a short to (C55) Left Blend Door Common Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 7

7.CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT





Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit.

Is the resistance below 10k ohms on any of the circuits?

Yes

- Repair all circuits with a resistance below 10k ohms for a short to the (C252) Right Blend Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 8

8.CHECK THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT





Measure the resistance between the (C52) Right Blend Door Common Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit.

Is the resistance below 10k ohms on any of the circuits?

Yes

- Repair all circuits with a resistance below 10k ohms for a short to the (C52) Right Blend Door Common Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 9

9.CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE





Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.

Is the resistance below 30.0 ohms?

Yes

- Go To 10

No

- Go To 11

10.CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C66) MODE DOOR COMMON DRIVER CIRCUIT





Disconnect the Mode Door Actuator harness connector.

Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C266) Mode Door Driver circuit for a short to the (C66) Mode Door Common Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Mode Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

11.CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE





Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.

Is the resistance below 30.0 ohms?

Yes

- Go To 12

No

- Go To 13

12.CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT





Disconnect the Left Blend Door Actuator harness connector.

Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C255) Left Blend Door Driver circuit for a short to the (C55) Left Blend Door Common Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Left Blend Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

13.CHECK THE RIGHT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE





Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.

Is the resistance below 30.0 ohms?

Yes

- Go To 14

No

- Go To 15

14.CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT





Disconnect the Right Blend Door Actuator harness connector.

Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C252) Right Blend Door Driver circuit for a short to the (C52) Right Blend Door Common Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Right Blend Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

15.CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE





Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector.

Is the resistance below 30.0 ohms?

Yes

- Go To 16

No

- Go To 17

16.CHECK THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT





Disconnect the Recirculation Door Actuator harness connector.

Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C268) Recirculation Door Driver circuit for a short to the (C68) Recirculation Door Common Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Recirculation Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

17.RUN THE ACTUATOR CALIBRATION TEST

Reconnect the A/C Heater Control C2 harness connector.

Reconnect the all of the Door Actuator harness connectors.

Turn the ignition on.

With the scan tool, erase HVAC DTCs.

Turn the ignition off, wait 10 seconds, and then turn the ignition on.

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: B10A2-LEFT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE?

Yes

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