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 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, to rotate the mode door actuator clockwise, the HVAC module supplies voltage to the DEFROST/PANEL/FLOOR mode door actuator motor through the circuit CH228 (YE/GY), and supplies ground through circuit CH229 (WH/BU). To rotate the mode door actuator counterclockwise, the HVAC module reverses the voltage and ground circuits.
The mode door actuator feedback resistor is supplied a ground from the HVAC module through circuit RH107 (GN/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
-------------------------------------------------
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 defrost/panel/floor 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.
-------------------------------------------------
J2 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a/C2356a.
- Measure the resistance between ground and:
- HVAC module C228a/C2356a-19, circuit CH229 (WH/BU), harness side.
- HVAC module C228a/C2356a-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.
-------------------------------------------------
J3 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO POWER
- Ignition OFF.
- Disconnect: HVAC Module C228a/C2356a.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module C228a/C2356a-19, circuit CH229 (WH/BU), harness side.
- HVAC module C228a/C2356a-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 power. TEST the system for normal operation.
No
GO to J5.
-------------------------------------------------
J4 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN
NOTE: Due to limited connector accessibility, before carrying out this test step, visually inspect the wiring between the HVAC module and actuator for opens or shorts. If no damage is visually evident, proceed with the test.
- Ignition OFF.
- Disconnect: HVAC Module C228a/C2356a.
- Disconnect: Defrost/Panel/Floor Door Actuator C2278.
- Measure the resistance between HVAC module C228a/C2356a-19, circuit CH229 (WH/BU), harness side and defrost/panel/floor door actuator C2278-1, circuit CH229 (WH/BU), harness side.
- Measure the resistance between HVAC module C228a/C2356a-20, circuit CH228 (YE/GY), harness side and defrost/panel/floor 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.
-------------------------------------------------
J5 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Measure the resistance between HVAC module C228a/C2356a-20, circuit CH228 (YE/GY), harness side and HVAC module C228a/C2356a-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.
-------------------------------------------------
J6 CHECK CIRCUIT VH436 (YE/VT) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a/C2356a.
- Measure the resistance between ground and HVAC module C228a/C2356a-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.
-------------------------------------------------
J7 CHECK CIRCUIT RH107 (GN/BU) FOR A SHORT TO CIRCUIT VH436 (YE/VT)
NOTE: Due to limited connector accessibility, before carrying out this test step, visually inspect the wiring between the HVAC module and actuator for opens or shorts. If no damage is visually evident, proceed with the test.
- Disconnect: Defrost/Panel/Floor Door Actuator C2278.
- Measure the resistance between HVAC module C228a/C2356a-10, circuit RH107 (GN/BU), harness side and HVAC module C228a/C2356a-8, circuit VH436 (YE/VT), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J13.
No
REPAIR circuits RH107 (GN/BU) and VH436 (YE/VT) for a short together. TEST the system for normal operation.
-------------------------------------------------
J8 CHECK CIRCUIT VH436 (YE/VT) FOR A SHORT TO POWER
- Ignition OFF.
- Disconnect: HVAC Module C228a/C2356a.
- Ignition ON.
- Measure the voltage between ground and HVAC module C228a/C2356a-8, circuit VH436 (YE/VT), harness side.
- Is any voltage present?
Yes
REPAIR circuit VH436 (YE/VT) for a short to power. TEST the system for normal operation.
No
GO to J9.
-------------------------------------------------
J9 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO CIRCUIT VH436 (YE/VT)
NOTE: Due to limited connector accessibility, before carrying out this test step, visually inspect the wiring between the HVAC module and actuator for opens or shorts. If no damage is visually evident, proceed with the test.
- Ignition OFF.
- Disconnect: Defrost/Panel/Floor Door Actuator C2278.
- Measure the resistance between HVAC module C228a/C2356a-11, circuit LH111 (BN/WH), harness side and HVAC module C228a/C2356a-8, circuit VH436 (YE/VT), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J10.
No
REPAIR circuits LH111 (BN/WH) and VH436 (YE/VT) for a short together. TEST the system for normal operation.
-------------------------------------------------
J10 CHECK CIRCUIT VH436 (YE/VT) FOR AN OPEN
- Measure the resistance between HVAC module C228a/C2356a-8, circuit VH436 (YE/VT), harness side and defrost/panel/floor 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.
-------------------------------------------------
J11 CHECK THE ACTUATOR RETURN CIRCUIT RH107 (GN/BU) FOR AN OPEN
- Measure the resistance between HVAC module C228a/C2356a-10, circuit RH107 (GN/BU), harness side and defrost/panel/floor door actuator C2278-2, circuit RH107 (GN/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J12.
No
REPAIR circuit RH107 (GN/BU) for an open. TEST the system for normal operation.
-------------------------------------------------
J12 CHECK CIRCUIT LH111 (BN/WH) FOR AN OPEN
- Measure the resistance between HVAC module C228a/C2356a-11, circuit LH111 (BN/WH), harness side and defrost/panel/floor 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.
-------------------------------------------------
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 Defrost/Panel/Floor Door Actuator component test. If the actuator tests OK, GO to J14. Defrost/Panel/Floor 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.
-------------------------------------------------
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.
-------------------------------------------------