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MTC







B1052-REAR BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (MTC)

For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .

Theory of Operation


The A/C Heater Control drives the Rear Mode Door Actuator via the (C153) Rear Mode Door Driver circuit and the (C34) Rear Common Door Driver circuit. The A/C Heater Control drives the Rear Blend Door Actuator via the (C54) Rear Blend Door Driver circuit and the (C34) Common Door Driver circuit.


- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater Control detects a short on the (C153) Rear Mode Door Driver circuit, the (C54) Rear Blend Door Driver circuit, or the (C34) Rear Common Door Driver circuit while attempting to drive the Rear Mode Door Actuator or the Rear Blend 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. Heating-A/C System Diagnostics


Diagnostic Test


1. CHECK (C153) REAR MODE DOOR DRIVER CIRCUIT, (C61) DRIVER BLEND DOOR DRIVER CIRCUIT, (C54) REAR BLEND DOOR DRIVER CIRCUIT, AND (C34) COMMON 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 (C153) Rear Mode Door Driver circuit in the A/C Heater Control C1 harness connector.
Measure the voltage of the (C61) Driver Door Driver circuit between ground and the A/C Heater Control C1 harness connector.
Measure the voltage of the (C54) Rear Blend Door Driver circuit in the A/C Heater Control C1 harness connector.
Measure the voltage of the (C34) Common Door Driver circuit in the A/C Heater Control C1 harness connector.
Is the voltage below 0.2 volts for all measurements?

Yes


- Go To 2


No


- Repair the circuit(s) with voltage above 0.2 volts for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


2. CHECK (C153) REAR MODE DOOR DRIVER CIRCUIT, (C61) DRIVER BLEND DOOR DRIVER CIRCUIT, (C54) REAR BLEND DOOR DRIVER CIRCUIT, AND (C34) COMMON DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance of the (C153) Rear Mode Door Driver circuit between ground and the A/C Heater Control C1 harness connector.
Measure the resistance of the (C61) Driver Door Driver circuit between ground and the A/C Heater Control C1 harness connector.
Measure the resistance of the (C54) Rear Blend Door Driver circuit between ground and the A/C Heater Control C1 harness connector.
Measure the resistance of the (C34) Common Door Driver circuit between ground and the A/C Heater Control C1 harness connector.
Is the resistance above 10k ohms for all measurements?

Yes


- Go To 3


No


- Repair the circuit(s) with a resistance below 10k ohms for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


3. CHECK (C153) REAR MODE DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)
Measure the resistance between the (C153) Rear Mode Door Driver circuit and the (C54) Rear Blend Door Driver circuit, the (C32) Recirculation Door Driver circuit, the (C34) Common 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 for all measurements?

Yes


- Go To 4


No


- Repair the circuit(s) with a resistance below 100 ohms for a short together.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


4. CHECK (C54) REAR BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)
Measure the resistance between the (C54) Rear Blend Door Driver circuit, the (C32) Recirculation Door Driver circuit, the (C34) Common Door Driver circuit, the (C807) Common Door Driver 2 circuit, the (C35) Mode 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 for all measurements?

Yes


- Go To 5


No


- Repair the circuit(s) with a resistance below 100 ohms for a short together.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


5. CHECK (C34) COMMON DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)
Measure the resistance between the (C34) Common Door Driver circuit and the (C32) Recirculation Door Driver circuit, the (C807) Common Door Driver 2 circuit, the (C35) Mode Door Driver circuit, and the (C61) Blend Door Driver circuit in the A/C Heater Control C1 harness connector.
Is the resistance above 100 ohms for all measurements?

Yes


- Go To 6


No


- Repair the circuit(s) with a resistance below 100 ohms for a short together.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


6. CHECK REAR MODE DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C153) Rear Mode Door Driver circuit and the (C34) Common Door Driver circuit in the A/C Heater Control C1 harness connector.
Is the resistance between 30 and 40 ohms?

Yes


- Go To 7


No


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


7. CHECK REAR BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C54) Rear Blend Door Driver circuit and the (C34) Common Door Driver circuit in the A/C Heater Control C1 harness connector.
Is the resistance between 30 and 40 ohms?

Yes


- Go To 8


No


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


8. RUN THE ACTUATOR CALIBRATION TEST
Reconnect the A/C Heater Control C1 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: B1052-REAR 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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