Pinpoint Test J: Incorrect/Erratic Direction of Airflow From Outlets
Climate Control System
Pinpoint Tests
Pinpoint Test J: Incorrect/Erratic Direction of Airflow From Outlets
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 defrost/panel/floor mode door actuator, the HVAC module supplies voltage and ground to the defrost/panel/floor mode door actuator motor through the actuator motor circuits. To reverse the defrost/panel/floor mode door actuator rotation, the HVAC module reverses the voltage and ground circuits.
The defrost/panel/floor 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 defrost/panel/floor mode door actuator feedback circuit to determine the defrost/panel/floor mode door actuator position by the position of the actuator feedback resistor wiper arm.
During an actuator calibration cycle, the HVAC module drives the defrost/panel/floor mode door until the door reaches both internal stops in the HVAC case. If the defrost/panel/floor 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
- Defrost/panel/floor mode door actuator
- HVAC module
- Mode door(s) binding or stuck
PINPOINT TEST J: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLETS
-------------------------------------------------
J1 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 J4.
For DTC B1086:11, GO to J2.
For DTC B1086:12, GO to J3.
For DTC B11E7:11, GO to J6.
For DTC B11E7:15, GO to J8.
No
INSPECT for broken linkage or door. REPAIR as necessary. If no condition is found, GO to J13.
-------------------------------------------------
J2 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228.
- Measure the resistance between ground and:
- HVAC module C228-6, circuit CH202 (BU/GN), harness side.
- HVAC module C228-7, circuit CH203 (GN/BN), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to J5.
No
REPAIR the circuit CH202 (BU/GN) or CH203 (GN/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J3 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C228.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module C228-6, circuit CH202 (BU/GN), harness side.
- HVAC module C228-7, circuit CH203 (GN/BN), harness side.
- Is any voltage present?
Yes
REPAIR the circuit CH202 (BU/GN) or CH203 (GN/BN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to J5.
-------------------------------------------------
J4 CHECK THE DEFROST/PANEL/FLOOR 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 C228.
- Disconnect: Defrost/Panel/Floor Mode Door Actuator C236.
- Measure the resistance between HVAC module C228-6, circuit CH202 (BU/GN), harness side and defrost/panel/floor mode door actuator C236-5, circuit CH202 (BU/GN), harness side.
- Measure the resistance between HVAC module C228-7, circuit CH203 (GN/BN), harness side and defrost/panel/floor mode door actuator C236-6, circuit CH203 (GN/BN), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to J13.
No
REPAIR the circuit CH202 (BU/GN) or CH203 (GN/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J5 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Measure the resistance between HVAC module C228-6, circuit CH202 (BU/GN), harness side and HVAC module C228-7, circuit CH203 (GN/BN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J13.
No
REPAIR circuits CH202 (BU/GN) and CH203 (GN/BN) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J6 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228.
- Measure the resistance between ground and HVAC module C228-21, circuit VH437 (VT/BN), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to J7.
No
REPAIR circuit VH437 (VT/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J7 CHECK THE SIGNAL RETURN CIRCUIT FOR A SHORT TO THE DEFROST/PANEL/FLOOR 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: Defrost/Panel/Floor Mode Door Actuator C236.
- Measure the resistance between HVAC module C228-21, circuit VH437 (VT/BN), harness side and HVAC module C228-23, circuit RH111 (GY/BU), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J13.
No
REPAIR circuits RH111 (GY/BU) and VH437 (VT/BN) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J8 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C228.
- Ignition ON.
- Measure the voltage between ground and HVAC module C228-21, circuit VH437 (VT/BN), harness side.
- Is any voltage present?
Yes
REPAIR circuit VH437 (VT/BN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to J9.
-------------------------------------------------
J9 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO THE DEFROST/PANEL/FLOOR 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.
- Ignition OFF.
- Disconnect: Defrost/Panel/Floor Mode Door Actuator C236.
- Measure the resistance between HVAC module C228-21, circuit VH437 (VT/BN), harness side and HVAC module C228-24, circuit LH111 (BN/WH), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J10.
No
REPAIR circuits LH111 (BN/WH) and VH437 (VT/BN) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J10 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC module C228-21, circuit VH437 (VT/BN), harness side and defrost/panel/floor mode door actuator C236-2, circuit VH437 (VT/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J11.
No
REPAIR circuit VH436 (YE/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J11 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR RETURN CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC module C228-23, circuit RH111 (GY/BU) harness side and defrost/panel/floor mode door actuator C236-1, circuit RH111 (GY/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J12.
No
REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J12 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC module C228-24, circuit LH111 (BN/WH), harness side and defrost/panel/floor mode door actuator C236-3, circuit LH111 (BN/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J13.
No
REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
J13 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR CONNECTION
- Inspect the defrost/panel/floor mode door actuator connector for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat the defrost/panel/floor mode door actuator connector.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
CARRY OUT the Defrost/Panel/Floor Mode Door Actuator component test. If the actuator tests OK, GO to J14. Climate Control System
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.
-------------------------------------------------
J14 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 takes approximately 30 seconds.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (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.
-------------------------------------------------