Pinpoint Test I: The Air Inlet Door Is Inoperative

Climate Control System

Pinpoint Tests

Pinpoint Test I: The Air Inlet Door is Inoperative

Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number

Normal Operation

Under normal operation, to rotate the air inlet door actuator, the HVAC module supplies voltage or ground to the air inlet air inlet door actuator motor through the circuit CH207 (BU/GY), and supplies ground or voltage through circuit CH208 (GN/OG) depending on desired rotation direction.

B1083:07-B1083:13:

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet door actuator motor
- HVAC module
- Stuck or bound linkage or door



PINPOINT TEST I: THE AIR INLET DOOR IS INOPERATIVE

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I1 CHECK THE HVAC MODULE FOR DTCs


- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Ignition ON.
- Check the HVAC module for DTCs.
- Are DTCs present?

Yes
For DTC B1083:11, GO to I2.

For DTC B1083:12, GO to I3.

For DTC B1083:13, GO to I4.

No
INSPECT for broken/binding linkage or door. REPAIR as necessary. If no condition is found, GO to I6.

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I2 CHECK CIRCUIT CH207 (BU/GY) AND CH208 (GN/OG) FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Measure the resistance between ground and:
- HVAC module C228a-16, circuit CH208 (GN/OG), harness side.
- HVAC module C228a-15, circuit CH207 (BU/GY), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to I5.

No
REPAIR circuit CH207 (BU/GY) or circuit CH208 (GN/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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I3 CHECK CIRCUIT CH207 (BU/GY) AND CH208 (GN/OG) FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module C228a-16, circuit CH208 (GN/OG), harness side.
- HVAC module C228a-15, circuit CH207 (BU/GY), harness side.




- Is any voltage present?

Yes
REPAIR circuit CH207 (BU/GY) or circuit CH208 (GN/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
GO to I5.

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I4 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN


- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Disconnect: Air Inlet Door Actuator C289.
- Measure the resistance between HVAC module C228a-16, circuit CH208 (GN/OG), harness side and recirc door actuator C289-6, circuit CH208 (GN/OG), harness side.




- Measure the resistance between HVAC module C228a-15, circuit CH207 (BU/GY), harness side and recirc door actuator C289-5, circuit CH207 (BU/GY), harness side.




- Are the resistances less than 5 ohms?

Yes
GO to I6.

No
REPAIR the circuit(s) for an open. TEST the system for normal operation.

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I5 CHECK CIRCUIT CH207 (BU/GY) FOR A SHORT TO CIRCUIT CH208 (GN/OG)


- Ignition OFF.
- Measure the resistance between HVAC module C228a-15, circuit CH207 (BU/GY), harness side and HVAC module C228a-16, circuit CH208 (GN/OG), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to I6.

No
REPAIR circuit CH208 (GN/OG) for a short to circuit CH207 (BU/GY). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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I6 CHECK THE ACTUATOR CONNECTION


- Clear the DTCs.
- Disconnect the actuator connector.
- Check for:
- corrosion.
- pushed-out connectors.
- incorrectly seated connector.
- Connect and correctly seat the actuator connector.
- Carry out the HVAC On-Demand Self Test. Alternate Diagnostic Methods - HVAC Module
- Operate the system.
- Does the concern return?

Yes
CARRY OUT the Recirc Door Actuator component test. If the actuator tests OK, GO to I7. Component Tests and General Diagnostics

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. TEST the system for normal operation.

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I7 CHECK MODULE CONNECTION


- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Carry out the HVAC Module On-Demand Self Test. Alternate Diagnostic Methods - HVAC Module
- Operate the system.
- Does the concern return?

Yes
INSTALL a new HVAC module. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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