Pinpoint Test K: Incorrect/Erratic Direction Of Airflow From Outlets
Climate Control System
Pinpoint Test K: Incorrect/Erratic Direction of Airflow From Outlets
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information [1][2]Diagrams By Number.
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information [1][2]Diagrams By Number.
Normal Operation
Under normal operation, to rotate the panel/defrost mode door actuator, the HVAC module supplies voltage or ground to the defrost/panel mode door actuator motor through circuits. To reverse the panel/defrost mode door actuator rotation, the HVAC module reverses the voltage and ground circuits.
The panel/defrost 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 panel/defrost mode door actuator feedback circuit to determine the panel/defrost mode door actuator position by the position of the actuator feedback resistor wiper arm.
To rotate the floor mode door actuator, the HVAC module supplies voltage or ground to the floor mode door actuator motor through circuits. To reverse the floor mode door actuator rotation, the HVAC module reverses the voltage and ground circuits. The floor mode door actuator is not equipped with a feedback resistor.
During an actuator calibration cycle, the HVAC module drives the panel/defrost mode door until the door reaches both internal stops in the HVAC case. If the panel/defrost 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
- Panel/defrost mode door actuator
- Floor mode door actuator
- HVAC module
- Stuck or bound linkage or door
PINPOINT TEST K : INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLETS
K1 CHECK THE HVAC MODULE FOR DTCs
- Ignition ON.
- Check the HVAC module for DTCs.
Are any DTCs present?
Yes
For DTC B1086:00, INSPECT for binding/damaged linkage or door. REPAIR as necessary. If no condition is found, GO to K4.
For DTC B125B:00, INSPECT for binding/damaged linkage or door. REPAIR as necessary. If no condition is found, GO to K13.
For DTC B1086:11 or DTC B125B:11, GO to K2.
For DTC B1086:12 or DTC B125B:12, GO to K3.
For DTC B11E7:11, GO to K6.
For DTC B11E7:15, GO to K8.
No
INSPECT for broken linkage or door. REPAIR as necessary. If no condition is found, GO to K14.
K2 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C294A.
- Disconnect: HVAC Module C294B.
- Disconnect: For DTC B1086:11, Panel/Defrost Mode Door Actuator C232.
- Disconnect: For DTC B125B:11, Floor Mode Door Actuator C234.
- For DTC B1086:11
NOTE: For DTC B1086:11.
Measure the resistance between ground and:
- HVAC module C294A-20, circuit CH228 (YE/GY), harness side.
- HVAC module C294A-21, circuit CH229 (WH/BU), harness side.
- For DTC B125B:11
NOTE: For DTC B125B:11.
Measure the resistance between ground and:
- HVAC module C294A-22, circuit CH202 (BU/GN), harness side.
- HVAC module C294A-23, circuit CH203 (GN/BN), harness side.
Are the resistances greater than 10,000 ohms?
Yes
GO to K5.
No
REPAIR the circuit CH228 (YE/GY) or CH229 (WH/BU) for a short to ground. TEST the system for normal operation.
K3 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C294A.
- Disconnect: HVAC Module C294B.
- Disconnect: For DTC B1086:12, Panel/Defrost Mode Door Actuator C232.
- Disconnect: For DTC B125B:12, Floor Mode Door Actuator C234.
- Ignition ON.
- For DTC B1086:12
NOTE: For DTC B1086:12.
Measure the voltage between ground and:
- HVAC module C294A-20, circuit CH228 (YE/GY), harness side.
- HVAC module C294A-21, circuit CH229 (WH/BU), harness side.
- For DTC B125B:12
NOTE: For DTC B125B:12.
Measure the voltage between ground and:
- HVAC module C294A-22, circuit CH202 (BU/GN), harness side.
- HVAC module C294A-23, circuit CH203 (GN/BN), harness side.
Is any voltage present?
Yes
REPAIR the circuit CH228 (YE/GY) or CH229 (WH/BU) for a short to voltage. TEST the system for normal operation.
No
GO to K5.
K4 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: HVAC Module C294A.
- Disconnect: HVAC Module C294B.
- Disconnect: Panel/Defrost Mode Door Actuator C232.
- Measure the resistance between panel/defrost door actuator C232-6, circuit CH228 (YE/GY), harness side and HVAC module C294A-20, circuit CH228 (YE/GY), harness side.
- Measure the resistance between panel/defrost door actuator C232-1, circuit CH229 (WH/BU), harness side and HVAC module C294A-21, circuit CH229 (WH/BU), harness side.
Are the resistances less than 5 ohms?
Yes
GO to K14.
No
REPAIR the circuit CH228 (YE/GY) or CH229 (WH/BU) for an open. TEST the system for normal operation.
K5 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- For DTC B1086:11 and 12
NOTE: For DTC B1086:11 and 12.
Measure the resistance between HVAC module C294A-20, circuit CH228 (YE/GY), harness side and HVAC module C294A-21, circuit CH229 (WH/BU), harness side.
- For DTC B125B:11 and 12
NOTE: For DTC B125B:11 and 12.
Measure the resistance between HVAC module C294A-22, circuit CH202 (BU/GN), harness side and HVAC module C294A-23, circuit CH203 (GN/BN), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to K14.
No
REPAIR circuits CH228 (YE/GY) and CH229 (WH/BU) for a short together. TEST the system for normal operation.
K6 CHECK CIRCUIT VH436 (YE/VT) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C294A.
- Disconnect: HVAC Module C294B.
- Measure the resistance between ground and HVAC module C294A-6, circuit VH436 (YE/VT), harness side.
Are the resistances greater than 10,000 ohms?
Yes
GO to K7.
No
REPAIR circuit VH436 (YE/VT) for a short to ground. TEST the system for normal operation.
K7 CHECK CIRCUIT RH111 (GY/BU) FOR A SHORT TO CIRCUIT VH436 (YE/VT)
- Disconnect: Panel/Defrost Mode Door Actuator C232.
- Measure the resistance between HVAC module C294A-4, circuit RH111 (GY/BU), harness side and HVAC module C294A-6, circuit VH436 (YE/VT), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to K14.
No
REPAIR circuits RH111 (GY/BU) and VH436 (YE/VT) for a short together. TEST the system for normal operation.
K8 CHECK CIRCUIT VH436 (YE/VT) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C294A.
- Disconnect: HVAC Module C294B.
- Ignition ON.
- Measure the voltage between ground and HVAC module C294A-6, circuit VH436 (YE/VT), harness side.
Is any voltage present?
Yes
REPAIR circuit VH436 (YE/VT) for a short to voltage. TEST the system for normal operation.
No
GO to K9.
K9 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO CIRCUIT VH436 (YE/VT)
- Ignition OFF.
- Disconnect: Panel/Defrost Mode Door Actuator C232.
- Measure the resistance between HVAC module C294A-3, circuit LH111 (BN/WH), harness side and HVAC module C294A-6, circuit VH436 (YE/VT), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to K10.
No
REPAIR circuits LH111 (BN/WH) and VH436 (YE/VT) for a short together. TEST the system for normal operation.
K10 CHECK CIRCUIT VH436 (YE/VT) FOR AN OPEN
- Measure the resistance between HVAC module C294A-6, circuit VH436 (YE/VT), harness side and panel/defrost mode door actuator C232-4, circuit VH436 (YE/VT), harness side.
Is the resistance less than 5 ohms?
Yes
GO to K11.
No
REPAIR circuit VH436 (YE/VT) for an open. TEST the system for normal operation.
K11 CHECK THE ACTUATOR RETURN CIRCUIT RH111 (GY/BU) FOR AN OPEN
- Measure the resistance between HVAC module C294A-4, circuit RH111 (GY/BU), harness side and panel/defrost mode door actuator C232-2, circuit RH111 (GY/BU), harness side.
Is the resistance less than 5 ohms?
Yes
GO to K12.
No
REPAIR circuit RH111 (GY/BU) for an open. TEST the system for normal operation.
K12 CHECK CIRCUIT LH111 (BN/WH) FOR AN OPEN
- Measure the resistance between HVAC module C294A-3, circuit LH111 (BN/WH), harness side and panel/defrost mode door actuator C232-3, circuit LH111 (BN/WH), harness side.
Is the resistance less than 5 ohms?
Yes
GO to K14.
No
REPAIR circuit LH111 (BN/WH) for an open. TEST the system for normal operation.
K13 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: HVAC Module C294A.
- Disconnect: HVAC Module C294B.
- Disconnect: Floor Mode Door Actuator C234.
- Measure the resistance between floor mode door actuator C234-5, circuit CH202 (BU/GN), harness side and HVAC module C294A-22, circuit CH202 (BU/GN), harness side.
- Measure the resistance between floor mode door actuator C234-6, circuit CH203 (GN/BN), harness side and HVAC module C294A-23, circuit CH203 (GN/BN), harness side.
Are the resistances less than 5 ohms?
Yes
GO to K14.
No
REPAIR the circuit CH202 (BU/GN) or CH203 (GN/BN) for an open. TEST the system for normal operation.
K14 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 Panel/Defrost Mode Door Actuator or Floor Mode Door Actuator component test. If the actuator tests OK, GO to K15. Component Tests
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.
K15 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 HVAC 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 position 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 now 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.