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 mode door actuator, the HVAC module supplies voltage or ground to the FLOOR/DEFROST/PANEL mode door actuator motor through circuit CH228 (YE/GY), and supplies ground or voltage through circuit CH229 (WH/BU) depending on desired rotation direction.
The mode door actuator feedback resistor is supplied a ground from the HVAC module through circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module reads the voltage on the mode door actuator feedback circuit VH436 (YE/VT) to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.
B11E7:11-B1086:13:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Mode door actuator
- HVAC module
- Stuck or bound linkage or door
PINPOINT TEST J: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLETS
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J1 CHECK THE HVAC MODULE FOR DTCs
- Ignition ON.
- Check the HVAC module for DTCs.
- Are DTCs present?
Yes
For DTC B1086:07, INSPECT for binding/damaged linkage or door. REPAIR as necessary. If no condition is found, INSTALL a new floor/defrost/panel door actuator. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
For DTC B1086:11, GO to J2.
For DTC B1086:12, GO to J3.
For DTC B1086:13, GO to J4.
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.
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J2 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Disconnect: Floor/Defrost/Panel Door Actuator C2278.
- Measure the resistance between ground and:
- HVAC module C228a-19, circuit CH229 (WH/BU), harness side.
- HVAC module C228a-20, circuit CH228 (YE/GY), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to J5.
No
REPAIR the circuit CH228 (YE/GY) or CH229 (WH/BU) for a short to ground. TEST the system for normal operation.
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J3 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Disconnect: Floor/Defrost/Panel Door Actuator C2278.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module C228a-19, circuit CH229 (WH/BU), harness side.
- HVAC module C228a-20, circuit CH228 (YE/GY), 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 J5.
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J4 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Disconnect: Floor/Defrost/Panel Door Actuator C2278.
- Measure the resistance between HVAC module C228a-19, circuit CH229 (WH/BU), harness side and floor/defrost/panel door actuator C2278-1, circuit CH229 (WH/BU), harness side.
- Measure the resistance between HVAC module C228a-20, circuit CH228 (YE/GY), harness side and floor/defrost/panel door actuator C2278-6, circuit CH228 (YE/GY), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to J13.
No
REPAIR the circuit CH228 (YE/GY) or CH229 (WH/BU) for an open. TEST the system for normal operation.
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J5 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Measure the resistance between HVAC module C228a-20, circuit CH228 (YE/GY), harness side and HVAC module C228a-19, circuit CH229 (WH/BU), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J13.
No
REPAIR circuit CH228 (YE/GY) and CH229 (WH/BU) for a short together. TEST the system for normal operation.
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J6 CHECK CIRCUIT VH436 (YE/VT) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Measure the resistance between ground and HVAC module C228a-8, circuit VH436 (YE/VT), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to J7.
No
REPAIR circuit VH436 (YE/VT) for a short to ground. TEST the system for normal operation.
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J7 CHECK CIRCUIT RH111 (GY/BU) FOR A SHORT TO CIRCUIT VH436 (YE/VT)
- Disconnect: Floor/Defrost/Panel Door Actuator C2278.
- Measure the resistance between HVAC module C228a-10, circuit RH111 (GY/BU), harness side and HVAC module C228a-8, circuit VH436 (YE/VT), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J13.
No
REPAIR circuit RH111 (GY/BU) and circuit VH436 (YE/VT) for a short together. TEST the system for normal operation.
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J8 CHECK CIRCUIT VH436 (YE/VT) 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-8, 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 J9.
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J9 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO CIRCUIT VH436 (YE/VT)
- Ignition OFF.
- Disconnect: Floor/Defrost/Panel Door Actuator C2278.
- Measure the resistance between HVAC module C228a-11, circuit LH111 (BN/WH), harness side and HVAC module C228a-8, circuit VH436 (YE/VT), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J10.
No
REPAIR circuit LH111 (BN/WH) and circuit VH436 (YE/VT) for a short together. TEST the system for normal operation.
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J10 CHECK CIRCUIT VH436 (YE/VT) FOR AN OPEN
- Measure the resistance between HVAC module C228a-8, circuit VH436 (YE/VT), harness side and floor/defrost/panel door actuator C2278-4, circuit VH436 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J11.
No
REPAIR circuit VH436 (YE/VT) for an open. TEST the system for normal operation.
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J11 CHECK THE ACTUATOR RETURN CIRCUIT RH111 (GY/BU) FOR AN OPEN
- Measure the resistance between HVAC module C228a-10, circuit RH111 (GY/BU), harness side and floor/defrost/panel door actuator C2278-2, 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. TEST the system for normal operation.
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J12 CHECK CIRCUIT LH111 (BN/WH) FOR AN OPEN
- Measure the resistance between HVAC module C228a-11, circuit LH111 (BN/WH), harness side and floor/defrost/panel door actuator C2278-3, 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. TEST the system for normal operation.
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J13 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 Floor/Defrost/Panel Door Actuator component test. If the actuator tests OK, GO to J14. Floor/Defrost/Panel Door Actuator
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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J14 CHECK THE MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Carry out the HVAC 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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