Pinpoint Test O: Temperature Control Is Inoperative/Does Not Operate Correctly
Climate Control System
Pinpoint Tests
Pinpoint Test O: Temperature Control is Inoperative/Does Not Operate Correctly
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 blend door actuator clockwise, the HVAC module supplies voltage to the blend door actuator motors through the door actuator feed A circuits, and supplies ground through the door actuator feed B circuits. To rotate the blend door actuator counterclockwise, the HVAC module reverses the voltage and ground circuits.
The blend door actuator feedback resistors are supplied a ground from the HVAC module by the blend door actuator return circuits and a 5-volt reference voltage on the blend door actuator reference circuits. The HVAC module reads the voltage on the blend door actuator feedback circuits to determine the blend door actuator position by the position of the actuator feedback resistor wiper arm.
Door actuator feed A circuits
- LH blend - CH238 (YE/OG)
- RH blend - CH212 (BU/OG)
Door actuator feed B circuits
- LH blend - CH239 (BU/WH)
- RH blend - CH213 (BN/GN)
Door actuator return circuits
- LH blend - RH107 (GN/BU)
- RH blend - RH107 (GN/BU)
Door actuator reference circuits
- LH blend - LH111 (BN/WH)
- RH blend - LH111 (BN/WH)
Door actuator feedback circuits
- LH blend - VH440 (BU/BN)
- RH blend - VH411 (VT/GN)
B11E5:11-B1082:13:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Blend door actuator
- HVAC module
- Stuck or bound linkage or door
PINPOINT TEST O: TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
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O1 CHECK THE HVAC MODULE FOR DTCs
- Ignition ON.
- Check the HVAC module for DTCs.
- Are DTCs present?
Yes
For DTC B1081:07 or B1082:07, INSPECT for binding/damaged linkage or door. REPAIR as necessary. If no condition is found, INSTALL a new door actuator. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
For DTC B1081:12 or B1082:12, GO to O2.
For DTC B1081:13 or B1082:13, GO to O3.
For DTC B1081:11 or B1082:11, GO to O4.
For DTC B11E5:15 or B11E6:15, GO to O6.
For DTC B11E5:11 or B11E6:11, GO to O10.
No
INSPECT for broken linkage or door. REPAIR as necessary. If no condition is found, GO to O13.
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O2 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO POWER
- Ignition OFF.
- Disconnect: HVAC Module C228a/C2356a.
- Disconnect: HVAC Module C228b/C2356b.
- Ignition ON.
- Measure the voltage between ground and:
- For DTC B1081:12, HVAC module C228a/C2356a-22, circuit CH238 (YE/OG), harness side.
- For DTC B1082:12, HVAC module C228b/C2356b-26, circuit CH212 (BU/OG), harness side.
- Measure the voltage between ground and:
- For DTC B1081:12, HVAC module C228a/C2356a-21, circuit CH239 (BU/WH), harness side.
- For DTC B1082:12, HVAC module C228b/C2356b-25, circuit CH213 (BN/GN), harness side.
- Are any voltages present?
Yes
REPAIR the circuit(s) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to O5.
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O3 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: HVAC Module C228b/C2356b.
- Disconnect: For DTC B1081:12, LH Blend Door Actuator C2091.
- Disconnect: For DTC B1082:12, RH Blend Door Actuator C2092 .
- Measure the resistance between:
- For DTC B1081:13, HVAC module C228a/C2356a-22, circuit CH238 (YE/OG), harness side and LH blend door actuator C2091-6, circuit CH238 (YE/OG), harness side.
- For DTC B1082:13, HVAC module C228b/C2356b-26, circuit CH212 (BU/OG), harness side and RH blend door actuator C2092-6, circuit CH212 (BU/OG), harness side.
- Measure the resistance between:
- For DTC B1081:13, HVAC module C228a/C2356a-21, circuit CH239 (BU/WH), harness side and LH blend door actuator C2091-5, circuit CH239 (BU/WH), harness side.
- For DTC B1082:13, HVAC module C228b/C2356b-25, circuit CH213 (BN/GN), harness side and RH blend door actuator C2092-5, circuit CH213 (BN/GN), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to O13.
No
REPAIR the circuit(s) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O4 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a/C2356a.
- Disconnect: HVAC Module C228b/C2356b.
- Measure the resistance between ground and:
- For DTC B1081:11, HVAC module C228a/C2356a-22, circuit CH238 (YE/OG), harness side.
- For DTC B1082:11, HVAC module C228b/C2356b-26, circuit CH212 (BU/OG), harness side.
- Measure the resistance between ground and:
- For DTC B1081:11, HVAC module C228a/C2356a-21, circuit CH239 (BU/WH), harness side.
- For DTC B1082:11, HVAC module C228b/C2356b-25, circuit CH213 (BN/GN), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to O5.
No
REPAIR the circuit(s) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O5 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER
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: For DTC B1081:11, LH Blend Door Actuator C2091.
- Disconnect: For DTC B1082:11, RH Blend Door Actuator C2092 .
DTC B1081:11
- NOTE: For DTC B1081:11.
- Measure the resistance between HVAC module C228a/C2356a-21, circuit CH239 (BU/WH), harness side and HVAC module C228a/C2356a-22, circuit CH238 (YE/OG), harness side.
DTC B1082:11
- NOTE: For DTC B1082:11.
- Measure the resistance between HVAC module C228b/C2356b-25, circuit CH213 (BN/GN), harness side and HVAC module C228b/C2356b-26, circuit CH212 (BU/OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to O13.
No
REPAIR circuit(s) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O6 CHECK CIRCUIT VH441 (WH/BN) OR VH440 (BU/BN) 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: HVAC Module C228b/C2356b.
- Disconnect: For DTC B11E5:15, LH Blend Door Actuator C2091.
- Disconnect: For DTC B11E6:15, RH Blend Door Actuator C2092 .
- Measure the resistance between the following:
- For DTC B11E5:15, HVAC module C228a/C2356a-7, circuit VH440 (BU/BN), harness side and LH blend door actuator C2091-2, circuit VH440 (BU/BN), harness side.
- For DTC B11E6:15, HVAC module C228b/C2356b-16, circuit VH441 (WH/BN), harness side and RH blend door actuator C2092-2, circuit VH441 (WH/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to O7.
No
REPAIR circuit VH441 (WH/BN) or VH440 (BU/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O7 CHECK CIRCUIT VH440 (BU/BN) OR VH441 (WH/BN) FOR A SHORT TO POWER
- Ignition ON.
- Measure the voltage between ground and the following:
- For DTC B11E5:15, HVAC module C228a/C2356a-7, circuit VH440 (BU/BN), harness side.
- For DTC B11E6:15, HVAC module C228b/C2356b-16, circuit VH441 (WH/BN), harness side.
- Is any voltage present?
Yes
REPAIR circuit VH441 (WH/BN) or VH440 (BU/BN) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to O8.
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O8 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO CIRCUIT VH441 (WH/BN) OR VH440 (BU/BN)
- Ignition OFF.
- Measure the resistance between HVAC module C228a/C2356a-11, circuit LH111 (BN/WH) and the following:
- For DTC B11E5:15, HVAC module C228a/C2356a-7, circuit VH440 (BU/BN), harness side.
- For DTC B11E6:15, HVAC module C228b/C2356b-16, circuit VH441 (WH/BN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to O9.
No
REPAIR circuits LH111 (BN/WH) and VH441 (WH/BN) or VH440 (BU/BN) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O9 CHECK THE ACTUATOR RETURN CIRCUIT RH107 (GN/BU) FOR AN OPEN
- Measure the resistance between HVAC module C228a/C2356a-10, circuit RH107 (GN/BU) and the following:
- For DTC B11E5:15, LH blend door actuator C2091-3, circuit RH107 (GN/BU), harness side.
- For DTC B11E6:15, RH blend door actuator C2092-3, circuit RH107 (GN/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to O13.
No
REPAIR circuit RH107 (GN/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O10 CHECK CIRCUIT VH440 (BU/BN) OR VH441 (WH/BN) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a/C2356a.
- Disconnect: HVAC Module C228b/C2356b.
- Measure the resistance between ground and the following:
- For DTC B11E5:11, HVAC module C228a/C2356a-7, circuit VH440 (BU/BN), harness side.
- For DTC B11E6:11, HVAC module C228b/C2356b-16, circuit VH441 (WH/BN), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to O11.
No
REPAIR circuit VH441 (WH/BN) or VH440 (BU/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O11 CHECK CIRCUIT RH107 (GN/BU) FOR A SHORT TO CIRCUIT VH441 (WH/BN) OR VH440 (BU/BN)
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: For DTC B11E5:11, LH Blend Door Actuator C2091.
- Disconnect: For DTC B11E6:11, RH Blend Door Actuator C2092 .
- Measure the resistance between HVAC module C228a/C2356a-10, circuit RH107 (GN/BU) and the following:
- For DTC B11E5:11, HVAC module C228a/C2356a-7, circuit VH440 (BU/BN), harness side.
- For DTC B11E6:11, HVAC module C228b/C2356b-16, circuit VH441 (WH/BN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to O12.
No
REPAIR circuits RH107 (GN/BU) and VH441 (WH/BN) or VH440 (BU/BN) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O12 CHECK CIRCUIT LH111 (BN/WH) FOR AN OPEN
- Measure the resistance between HVAC module C228a/C2356a-11, circuit LH111 (BN/WH) and the following:
- For DTC B11E5:11, LH blend door actuator C2091-1, circuit LH111 (BN/WH), harness side.
- For DTC B11E6:11, RH blend door actuator C2092-1, circuit LH111 (BN/WH), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to O13.
No
REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O13 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 blend door actuator component test. If the actuator tests OK, GO to O14. Blend 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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O14 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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