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MTC







B1040-PANEL MODE DOOR 1 CONTROL CIRCUIT/PERFORMANCE (MTC)





For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .

Theory of Operation


The A/C Heater Control drives the Mode Door Actuator via the (C35) Mode Door Driver circuit and the (C807) Common Door Driver 2 circuit. The Mode Door 1 Actuator shares the (C807) Common Door Driver 2 circuit with the (C33) Passenger Blend Door Actuator circuit, the (C61) Driver Blend Door Actuator circuit, and the (C32) Recirculation Door Actuator circuit.


- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater Control detects a short on the (C35) Mode Door Driver circuit or the (C807) Common Door Driver 2 circuit while attempting to drive this actuator.







NOTE: The DTC must be active for the results of this test to be valid. Do not perform this test if the DTC is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. Heating-A/C System Diagnostics


Diagnostic Test


1. CHECK (C35) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C35) Mode Door Driver circuit in the A/C Heater Control C1 harness connector.
Is the voltage above 0.2 volts?

Yes


- Repair the (C35) Mode Door 1 Driver circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 2


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




Measure the voltage between ground and the (C61) Driver Blend Door Actuator circuit in the A/C Heater Control C1 harness connector.
Is the voltage above 0.2 volts?

Yes


- Repair the (C61) Driver Blend Door Actuator circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 8


3. CHECK (C32) RECIRCULATION DOOR ACTUATOR CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage between ground and the (C32) Recirculation Door Actuator circuit in the A/C Heater Control C1 harness connector.
Is the voltage above 0.2 volts?

Yes


- Repair the (C32) Recirculation Door Actuator circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 9


4. CHECK (C33) PASSENGER BLEND DOOR ACTUATOR CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage between ground and the (C33) Passenger Blend Door Actuator circuit in the A/C Heater Control C1 harness connector.
Is the voltage above 0.2 volts?

Yes


- Repair the (C33) Passenger Blend Door Actuator circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 5


5. CHECK (C807) COMMON DOOR DRIVER 2 CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage between ground and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.
Is the voltage above 0.2 volts?

Yes


- Repair the (C807) Common Door Driver 2 circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 6.


6. CHECK (C35) MODE DOOR 1 DRIVER CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance between ground and the (C35) Mode Door Driver circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 10k ohms?

Yes


- Repair the (C35) Mode Door Driver circuit for a short to ground.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 7


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




Measure the resistance between ground and the (C61) Driver Blend Door Actuator circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 10K ohms?

Yes


- Repair the (C61) Driver Blend Door Actuator circuit for a short to ground.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 8


8. CHECK (C32) RECIRCULATION DOOR ACTUATOR CIRCUIT FOR A SHORT TO GROUND




Measure the resistance between ground and the (C32) Recirculation Door Actuator circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 10K ohms?

Yes


- Repair the (C32) Recirculation Door Actuator circuit for a short to ground.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 9


9. CHECK (C33) PASSENGER BLEND DOOR ACTUATOR CIRCUIT FOR A SHORT TO GROUND




Measure the resistance between ground and the (C33) Passenger Blend Door Actuator circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 10K ohms?

Yes


- Repair the (C33) Passenger Blend Door Actuator circuit for a short to ground.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 10


10. CHECK (C807) COMMON DOOR DRIVER 2 CIRCUIT FOR A SHORT TO GROUND




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 below 10k ohms?

Yes


- Repair the (C807) Common Door Driver 2 circuit for a short to ground.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 11.


11. CHECK (C35) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS




Measure the resistance between the (C35) Mode Door Driver circuit and the (C807) Common Door Driver 2 circuit, the (C32) Recirculation Door Driver circuit, the (C33) Passenger Blend Door Driver circuit, and the (C61) Driver Blend Door Driver circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 100 ohms between the (C35) Mode Door 1 Driver circuit and any of the other door driver circuits?

Yes


- Repair the circuit(s) with a resistance below 100 ohms for a short to the (C35) Mode Door Driver circuit.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 12


12. CHECK MODE DOOR ACTUATOR CIRCUIT RESISTANCE




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 13


No


- Replace the Mode Door Actuator.
- Perform the HVAC ACTUATOR CALIBRATION PROCEDURE. HVAC Actuator Calibration Procedure


13. CHECK PASSENGER BLEND DOOR ACTUATOR CIRCUIT RESISTANCE




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 Blend Door Actuator.
- Perform the HVAC ACTUATOR CALIBRATION PROCEDURE. HVAC Actuator Calibration Procedure


14. CHECK DRIVER BLEND DOOR ACTUATOR CIRCUIT RESISTANCE




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 15


No


- Replace the Driver Blend Door Actuator.
- Perform the HVAC ACTUATOR CALIBRATION PROCEDURE. HVAC Actuator Calibration Procedure


15. CHECK RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE




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


- Replace the A/C Heater Control.
- Perform the HVAC ACTUATOR CALIBRATION PROCEDURE. HVAC Actuator Calibration Procedure


No


- Replace the Recirculation Door Actuator.
- Perform the HVAC ACTUATOR CALIBRATION PROCEDURE. HVAC Actuator Calibration Procedure

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