ATC

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





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 Actuator shares the (C807) Common Door Driver 2 circuit with the Recirculation Door Actuator, and the Passenger Blend Door Actuator.


- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater Control detects a short on the (C35) Mode Door Driver circuit, the (C32) Recirculation Door Driver, the (C33) Passenger Blend Door Actuator, or the (C807) Common Door Driver 2 circuit while attempting to drive the Mode Door 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 (3 ZONE ATC) 32 way harness connector.
Turn the ignition on.
Measure the voltage of the (C35) Mode Door Driver circuit in the A/C Heater Control (3 ZONE ATC) 32 way 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 (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition off.
Turn the ignition on.
Measure the voltage of the (C32) Recirculation Door Driver circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is there any voltage present?

Yes


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


No


- Go To 4


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




Measure the voltage of the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is there any voltage present?

Yes


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


No


- Go To 4


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




Measure the voltage of the (C807) Common Door Driver 2 circuit in the A/C Heater Control (3 ZONE ATC) 32 way 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 5


5. 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 1 Driver circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the resistance below 10k ohms?

Yes


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


No


- Go To 6


6. 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 (3 ZONE ATC) 32 way 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 7


7. CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance between ground and the (C32) Recirculation Door Driver circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the resistance above 10k ohms?

Yes


- Go To 8


No


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


8. CHECK (C33) PASSENGER BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND




Measure the resistance between ground and the (C33) Passenger Blend Door Driver circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the resistance above 10k ohms?

Yes


- Go To 9


No


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


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




Measure the resistance between the (C35) Mode Door 1 Driver circuit and the (C33) Passenger Blend Door Driver circuit, the (C32) Recirculation Door Driver circuit, and the (C807) Common Door Driver 2 circuit in the A/C Heater Control (3 ZONE ATC) 32 way 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 10


10. CHECK MODE DOOR 1 ACTUATOR CIRCUIT RESISTANCE




Measure the resistance between the (C35) Mode Door 1 Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the resistance between 30 and 40 ohms?

Yes


- Go To 11


No


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


11. 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 (3 ZONE ATC) 32 way harness connector.
Is the resistance between 30 and 40 ohms?

Yes


- Go To 12


No


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


12. 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 (3 ZONE ATC) 32 way harness connector.
Is the resistance between 30 and 40 ohms?

Yes


- Go To 13


No


- Replace the Passenger Blend Door Actuator.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


13. RUN THE ACTUATOR CALIBRATION TEST
Reconnect the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
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: B1040-PANEL MODE DOOR 1 CONTROL CIRCUIT/PERFORMANCE?

Yes


- Replace the A/C Heater Control.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC 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.