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B105F






B105F-CLIMATE CONTROL MOTOR(S) COMMON 1 CONTROL CIRCUIT LOW (MTC)





For a complete wiring diagram refer to Diagrams/Electrical.

Theory of Operation

The A/C Heater Control drives the Front Blend Door Actuator via the (C61) Front Blend Door Driver circuit and the (C34) Front Common Door Driver circuit. The A/C Heater Control drives the Mode Door 1 (Floor to Panel) Actuator via the (C29) Mode Door 1 Driver circuit and the (C34) Front Common Door Driver circuit. The A/C Heater Control drives the Mode Door 2 (Floor to Defrost) Actuator via the (C801) Mode Door 2 Driver circuit and the (C34) Front Common Door Driver circuit. The A/C Heater Control drives the Recirculation Door Actuator via the (C32) Recirculation Door Driver circuit and the (C34) Front Common Door Driver circuit. All of the front door actuators share the (C34) Front 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 (C34) Front Common Door Driver circuit is shorted to ground.





Diagnostic Test

1.CHECK (C34) FRONT COMMON DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.

Disconnect the A/C Heater Control C1 harness connector.

Measure the resistance of the (C34) Front Common Door Driver circuit between ground and the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C34) Front Common Door Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No, Vehicles With Rear HVAC

- Go To 2

No, Vehicles Without Rear HVAC

- Go To 3

2.CHECK (C34) FRONT COMMON DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS





Measure the resistance between the (C34) Front Common Door Driver 1 circuit and the (C53) Rear Mode Door Driver circuit, the (C154) Rear Common Door Driver circuit, and the (C54) Rear Blend Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms between the (C34) Front Common Door Driver circuit and any of the other door driver circuits?

Yes

- Repair the circuits with a resistance below 10k ohms for a short to the (C34) Front Common Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3.CHECK FRONT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE





Measure the resistance between the (C61) Front Blend Door Driver circuit and the (C34) Front Common Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 30 ohms?

Yes

- Go To 4

No

- Go To 5

4.CHECK (C61) FRONT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO (C34) FRONT COMMON DOOR DRIVER CIRCUIT





Disconnect the Front Blend Door Actuator harness connector.

Measure the resistance between the (C61) Front Blend Door Driver circuit and the (C34) Front Common Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C61) Front Blend Door Driver circuit for a short to the (C34) Front Common Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

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

5.CHECK MODE DOOR 1 (FLOOR TO PANEL) ACTUATOR CIRCUIT RESISTANCE





Measure the resistance between the (C29) Mode Door 1 Driver circuit and the (C34) Front Common Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 30 ohms?

Yes

- Go To 6

No

- Go To 7

6.CHECK (C29) MODE DOOR 1 DRIVER CIRCUIT FOR A SHORT TO (C34) FRONT COMMON DOOR DRIVER CIRCUIT





Disconnect the Mode Door 1 (Floor to Panel) Actuator harness connector.

Measure the resistance between the (C29) Mode Door 1 Driver circuit and the (C34) Front Common Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C29) Mode Door 1 Driver circuit for a short to the (C34) Front Common Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Mode Door 1 (Floor to Panel) Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

7.CHECK MODE DOOR 2 (FLOOR TO DEFROST) ACTUATOR CIRCUIT RESISTANCE





Measure the resistance between the (C801) Mode Door 2 Driver circuit and the (C34) Front Common Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 30 ohms?

Yes

- Go To 8

No

- Go To 9

8.CHECK (C801) MODE DOOR 2 DRIVER CIRCUIT FOR A SHORT TO (C34) FRONT COMMON DOOR DRIVER CIRCUIT





Disconnect the Mode Door 2 (Floor to Defrost) Actuator harness connector.

Measure the resistance between the (C801) Mode Door 2 Driver circuit and the (C34) Front Common Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C801) Mode Door 2 Driver circuit for a short to the (C34) Front Common Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Mode Door 2 (Floor to Defrost) Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

9.CHECK RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE





Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C34) Front Common Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 30 ohms?

Yes

- Go To 10

No

- Go To 11

10.CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO (C34) FRONT COMMON DOOR DRIVER CIRCUIT





Disconnect the Recirculation Door Actuator harness connector.

Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C34) Front Common Door Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C32) Recirculation Door Driver circuit for a short to the (C34) Front Common Door 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

11.RUN THE ACTUATOR DTC DETECTION TEST

Reconnect the A/C Heater Control C1 harness connector.

Turn the ignition on.

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: B105F-CLIMATE CONTROL MOTOR(S) COMMON 1 CONTROL CIRCUIT LOW?

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). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs.

No, And No 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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