Pinpoint Test I: The Air Inlet Door is Inoperative
Climate Control System
Pinpoint Test I: The Air Inlet Door is Inoperative
Normal Operation
Under normal operation, to rotate the air inlet mode door actuator, the HVAC module supplies voltage and ground to the air inlet mode door actuator through the actuator motor circuits. To reverse the air inlet mode door actuator rotation, the HVAC module reverses the voltage and ground circuits.
The air inlet mode door actuator feedback resistor is supplied a 5-volt reference voltage and ground from the HVAC module. The HVAC module measures the resistance on the air inlet mode door actuator feedback circuit to determine the air inlet mode door actuator position by the position of the actuator feedback resistor wiper arm.
During an actuator calibration cycle, the HVAC module drives the air inlet mode door until the door reaches both internal stops in the HVAC case. If the air inlet mode door is temporarily obstructed or binding during a calibration cycle, the HVAC module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the airflow may not be from the expected outlets.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet mode door actuator
- HVAC module
- Stuck or bound linkage or door
PINPOINT TEST I : THE AIR INLET DOOR IS INOPERATIVE
I1 CHECK THE HVAC MODULE FOR DTCs
- Ignition ON.
- Check the HVAC module for DTCs.
Are DTCs present?
Yes
For DTC B1083:07, INSPECT for binding/damaged linkage or door. REPAIR as necessary. If no condition is found, INSTALL a new door actuator. CONNECT the actuator electrical connector before the HVAC module connector(s). This will allow the new actuator to be calibrated when the HVAC module is reconnected. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
For DTC B1083:11, GO to I2.
For DTC B1083:12, GO to I3.
For DTC B1083:13, GO to I4.
For DTC B11F0:11, GO to I6.
For DTC B11F0:15, GO to I8.
No
INSPECT for broken/binding linkage or door. REPAIR as necessary. If no condition is found, GO to I13.
I2 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228A/C2356A.
- Measure the resistance between ground and:
- HVAC module C228A/C2356A-16, circuit CH208 (GN/OG), harness side.
- HVAC module C228A/C2356A-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 CH208 (GN/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
I3 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C228A/C2356A.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module C228A/C2356A-16, circuit CH208 (GN/OG), harness side.
- HVAC module C228A/C2356A-15, circuit CH207 (BU/GY), harness side.
Is any voltage present?
Yes
REPAIR circuit CH207 (BU/GY) or CH208 (GN/OG) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to I5.
I4 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR AN OPEN
NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Ignition OFF.
- Disconnect: HVAC Module C228A/C2356A.
- Disconnect: Air Inlet Door Actuator C289.
- Measure the resistance between HVAC module C228A/C2356A-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/C2356A-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 I13.
No
REPAIR the circuit(s) for an open. TEST the system for normal operation.
I5 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER
NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Ignition OFF.
- Disconnect: Air Inlet Door Actuator C289.
- Measure the resistance between HVAC module C228A/C2356A-15, circuit CH207 (BU/GY), harness side and HVAC module C228A/C2356A-16, circuit CH208 (GN/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to I13.
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.
I6 CHECK THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228A/C2356A.
- Measure the resistance between ground and HVAC module C228A/C2356A-3, circuit VH438 (GN/VT), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to I7.
No
REPAIR circuit VH438 (GN/VT) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
I7 CHECK THE SIGNAL RETURN CIRCUIT FOR A SHORT TO THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT
NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Disconnect: Air Inlet Door Actuator C289.
- Measure the resistance between HVAC module C228A/C2356A-10, circuit RH107 (GN/BU), harness side and HVAC module C228A/C2356A-3, circuit VH438 (GN/VT), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to I13.
No
REPAIR circuits VH438 (GN/VT) and RH107 (GN/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
I8 CHECK THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C228A/C2356A.
- Ignition ON.
- Measure the voltage between ground and HVAC module C228A/C2356A-3, circuit VH438 (GN/VT), harness side.
Is any voltage present?
Yes
REPAIR circuit VH438 (GN/VT) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to I9.
I9 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT
NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Disconnect: Air Inlet Door Actuator C289.
- Measure the resistance between HVAC module C228A/C2356A-11, circuit LH111 (BN/WH), harness side and HVAC module C228A/C2356A-3, circuit VH438 (GN/VT), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to I10.
No
REPAIR circuits VH438 (GN/VT) and LH111 (BN/WH) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
I10 CHECK THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC module C228A/C2356A-3, circuit VH438 (GN/VT), harness side and air inlet door actuator C289-2, circuit VH438 (GN/VT), harness side.
Is the resistance less than 5 ohms?
Yes
GO to I11.
No
REPAIR circuit VH438 (GN/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
I11 CHECK THE AIR INLET MODE DOOR ACTUATOR RETURN CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC module C228A/C2356A-11, circuit LH111 (BN/WH), harness side and air inlet door actuator C289-1, circuit LH111 (BN/WH), harness side.
Is the resistance less than 5 ohms?
Yes
GO to I12.
No
REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
I12 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC module C228A/C2356A-10, circuit RH107 (GN/BU), harness side and air inlet door actuator C289-3, circuit RH107 (GN/BU), harness side.
Is the resistance less than 5 ohms?
Yes
GO to I13.
No
REPAIR circuit RH107 (GN/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
I13 CHECK THE ACTUATOR CONNECTION
- Inspect the connector for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat the actuator connector.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
CARRY OUT the Air Inlet Mode Door Actuator component test. If a new actuator is installed, CONNECT the actuator electrical connector before the HVAC module connector(s). This will allow the new actuator to be calibrated when the HVAC module is reconnected. If the actuator tests OK, GO to I14. 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.
I14
MODULE ACTUATOR POSITION CALIBRATION
NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. To carry out the calibration, follow the steps below.
- Ignition OFF.
- Inspect the module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat all the HVAC module connectors.
- Ignition ON.
- Clear the DTCs.
- Select any mode except OFF.
- NOTE: The HVAC module will now initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.
Operate the system and verify the concern is still present.
Is the concern still present?
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 foreign object in the HVAC case or temporary binding that restricted actuator door travel. CHECK any actuator external linkage. If condition recurs, INSPECT actuator linkage and door for binding and CHECK HVAC case for foreign objects.