Pinpoint Test J: Incorrect/Erratic Direction Of Airflow From Outlets
Climate Control System
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 Electrical Diagrams.
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information Electrical Diagrams.
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
- Front Controls Interface Module (FCIM)
- Defrost/panel/floor mode door 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 B1086:11, GO to J3.
For DTC B1086:12, GO to J4.
For DTC B1086:13, GO to J5.
For DTC B11E7:11, GO to J7.
For DTC B11E7:15, GO to J10.
No
GO to J2.
J2 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR OPERATION USING ACTIVE COMMANDS
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger- HVAC Module PID (Air Mode Actuator (AIR_MODE_DPOS)).
- Select PANEL mode on the HVAC controls.
- Select the highest blower motor setting.
- Observe airflow while using the scan tool to operate the HVAC module active command AIR_MODE_DPOS, increasing and decreasing the percentage value.
Does the airflow change between the defrost, panel and floor outlets when the active command is changed?
Yes
INSTALL a new Front Controls Interface Module (FCIM). TEST the system for normal operation.
No
INSPECT for broken linkage or door. REPAIR as necessary. If no condition is found, GO to J14.
J3 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module- Electronic Manual Temperature Control (EMTC) C2357.
- Disconnect: HVAC Module- Dual Automatic Temperature Control (DATC) C228A.
- For EMTC (Electronic Manual Temperature Control) systems
For EMTC (Electronic Manual Temperature Control) systems, measure the resistance between ground and:
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-6, circuit CH229 (WH/BU), harness side.
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-7, circuit CH228 (YE/GY), harness side.
- For DATC (Dual Automatic Temperature Control) systems
For DATC (Dual Automatic Temperature Control) systems, measure the resistance between ground and:
- HVAC module- DATC (Dual Automatic Temperature Control) C228A-6, circuit CH229 (WH/BU), harness side.
- HVAC module- DATC (Dual Automatic Temperature Control) C228A-7, circuit CH228 (YE/GY), harness side.
Are the resistances greater than 10,000 ohms?
Yes
GO to J6.
No
REPAIR the circuit CH229 (WH/BU)/(BU) or CH228 (YE/GY)/(GY/BK) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
J4 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C2357.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A.
- Ignition ON.
- For EMTC (Electronic Manual Temperature Control) systems
For EMTC (Electronic Manual Temperature Control) systems, measure the voltage between ground and:
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-6, circuit CH229 (WH/BU), harness side.
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-7, circuit CH228 (YE/GY), harness side.
- For DATC (Dual Automatic Temperature Control) systems
For DATC (Dual Automatic Temperature Control) systems, measure the voltage between ground and:
- HVAC module- DATC (Dual Automatic Temperature Control) C228A-6, circuit CH229 (WH/BU), harness side.
- HVAC module- DATC (Dual Automatic Temperature Control) C228A-7, circuit CH228 (YE/GY), harness side.
Is any voltage present?
Yes
REPAIR the circuit CH229 (WH/BU)/(BU) or CH228 (YE/GY)/(GY/BK) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to J6.
J5 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 carrying out 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- EMTC (Electronic Manual Temperature Control) C2357.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A.
- Disconnect: Defrost/Panel/Floor Mode Door Actuator C2278.
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-6, circuit CH229 (WH/BU), harness side and defrost/panel/floor door actuator C2278-6, circuit (BU), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-6, circuit CH229 (WH/BU), harness side and defrost/panel/floor door actuator C2278-6, circuit (BU), harness side.
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-7, circuit CH228 (YE/GY), harness side and defrost/panel/floor door actuator C2278-7, circuit (GY/BK), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-7, circuit CH228 (YE/GY), harness side and defrost/panel/floor door actuator C2278-7, circuit (GY/BK), harness side.
Are the resistances less than 5 ohms?
Yes
GO to J14.
No
REPAIR the circuit CH229 (WH/BU)/(BU) or CH228 (YE/GY)/(GY/BK) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
J6 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect: Defrost/Panel/Floor Mode Door Actuator C2278.
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-6, circuit CH229 (WH/BU), harness side and HVAC module- EMTC (Electronic Manual Temperature Control) C228A-7, circuit CH228 (YE/GY), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-6, circuit CH229 (WH/BU), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C228A-7, circuit CH228 (YE/GY), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to J14.
No
REPAIR circuits CH229 (WH/BU)/(BU) and CH228 (YE/GY)/(GY/BK) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
J7 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C2357.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B.
- Measure the resistance between ground and:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-21, circuit VH436 (YE/VT), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-21, circuit VH436 (YE/VT), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to J8.
No
REPAIR circuit VH436 (YE/VT)/(BU/RD) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
J8 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 carrying out 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 C2278.
- Measure the resistance between HVAC module C228A-21, circuit VH436 (YE/VT), harness side and HVAC module C228A-23, circuit RH111 (GY/BU), harness side.
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-21, circuit VH436 (YE/VT), harness side and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-23, circuit RH111 (GY/BU), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-21, circuit VH436 (YE/VT), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C228A-23, circuit RH111 (GY/BU), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to J9.
No
REPAIR circuits RH111 (GY/BU)/(BK) and VH436 (YE/VT)/(BU/RD) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
J9 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-24, circuit LH111 (BN/WH), harness side and defrost/panel/floor door actuator C2278-3, circuit (OG), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-24, circuit LH111 (BN/WH), harness side and defrost/panel/floor door actuator C2278-3, circuit (OG), harness side.
Is the resistance less than 5 ohms?
Yes
GO to J14.
No
REPAIR circuit LH111 (BN/WH)/(OG) for an open. 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 A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C2357.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B.
- Ignition ON.
- Measure the voltage between ground and:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-21, circuit VH436 (YE/VT), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-21, circuit VH436 (YE/VT), harness side.
Is any voltage present?
Yes
REPAIR circuit VH436 (YE/VT)/(BU/RD) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to J11.
J11 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 carrying out 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 C2278.
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-21, circuit VH436 (YE/VT), harness side and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-24, circuit LH111 (BN/WH), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-21, circuit VH436 (YE/VT), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C228A-24, circuit LH111 (BN/WH), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to J12.
No
REPAIR circuits LH111 (BN/WH)/(OG) and VH436 (YE/VT)/(BU/RD) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
J12 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR AN OPEN
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-21, circuit VH436 (YE/VT), harness side and defrost/panel/floor door actuator C2278-5, circuit (BU/RD), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-21, circuit VH436 (YE/VT), harness side and defrost/panel/floor door actuator C2278-5, circuit (BU/RD), harness side.
Is the resistance less than 5 ohms?
Yes
GO to J13.
No
REPAIR circuit VH436 (YE/VT)/(BU/RD) 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 RETURN CIRCUIT FOR AN OPEN
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-23, circuit RH111 (GY/BU), harness side and defrost/panel/floor door actuator C2278-1, circuit (BK), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC Module- DATC (Dual Automatic Temperature Control) C228A-23, circuit RH111 (GY/BU), harness side and defrost/panel/floor door actuator C2278-1, circuit (BK), harness side.
Is the resistance less than 5 ohms?
Yes
GO to J14.
No
REPAIR circuit RH111 (GY/BU)(BK) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
J14 CHECK THE DEFROST/PANEL/FLOOR MODE DOOR ACTUATOR CONNECTION
- Disconnect the defrost/panel/floor mode door actuator connector.
- Inspect the defrost/panel/floor mode door actuator component and harness side connectors for:
- corrosion
- damaged pins
- pushed-out terminals
- Connect and correctly seat the actuator connector.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test- HVAC Module.
- 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 Component Tests. If the actuator tests OK, GO to J15. When installing an actuator, CONNECT the actuator electrical connector before the HVAC module connector(s). This allows the actuator to be calibrated when the HVAC module is reconnected.
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.
J15 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 component and harness side connectors for:
- corrosion
- damaged pins
- pushed-out terminals
- Connect and correctly seat all the HVAC module connectors.
- Ignition ON.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test- HVAC Module.
- 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. 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.