Pinpoint Test T: The Auxiliary Temperature Control Is Inoperative/Does Not Operate Correctly Using The Front/Rear Auxiliary Cli
Climate Control System
Pinpoint Tests
Pinpoint Test T: The Auxiliary Temperature Control is Inoperative/Does Not Operate Correctly Using the Front/Rear Auxiliary Climate Controls
Refer to Wiring Diagram Set 52, Auxiliary Climate Control for schematic and connector information. Diagrams By Number
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 auxiliary temperature door actuator through circuit CH245 (BU/BN), and supplies ground or voltage through circuit CH244 (GY) depending on desired rotation direction.
The auxiliary temperature door actuator feedback resistor is supplied a ground from the HVAC module through circuit RH111 (GY/BN) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module reads the voltage on the auxiliary temperature door actuator feedback circuit VHA09 (VT/BN) to determine the auxiliary temperature door actuator position by the position of the actuator feedback resistor wiper arm.
B10B7:11-B11E3:13:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Auxiliary temperature door actuator
- HVAC module
- Auxiliary climate control assembly
- Stuck or bound linkage or door
PINPOINT TEST T: THE AUXILIARY TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY USING THE FRONT/REAR AUXILIARY CLIMATE CONTROLS
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T1 CHECK THE HVAC MODULE FOR DTCs
- Ignition ON.
- Check the HVAC module for DTCs.
- Are DTCs present?
Yes
For DTC B11E3:07, 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 B11E3:11, GO to T2.
For DTC B11E3:12, GO to T3.
For DTC B11E3:13, GO to T4.
For DTC B10B7:11, GO to T6.
For DTC B10B7:15, GO to T8.
For DTC B11EB:11, GO to T13.
For DTC B11EB:15, GO to T14.
No
INSPECT for broken linkage or door. REPAIR as necessary. If no condition is found, GO to T16.
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T2 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND
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.
- Disconnect: HVAC Module C228b.
- Disconnect: Auxiliary Temperature Blend Door Actuator C3004.
- Measure the resistance between ground and:
- HVAC module C228b-12, circuit CH244 (GY), harness side.
- HVAC module C228b-13, circuit CH245 (BU/BN), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to T5.
No
REPAIR the circuit(s) for a short to ground. TEST the system for normal operation.
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T3 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO VOLTAGE
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.
- Disconnect: HVAC Module C228b.
- Disconnect: Auxiliary Temperature Blend Door Actuator C3004.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module C228b-12, circuit CH244 (GY), harness side.
- HVAC module C228b-13, circuit CH245 (BU/BN), harness side.
- Is any voltage present?
Yes
REPAIR the circuit(s) for a short to voltage. TEST the system for normal operation.
No
GO to T5.
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T4 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.
- Disconnect: HVAC Module C228b.
- Disconnect: Auxiliary Temperature Blend Door Actuator C3004.
- Measure the resistance between HVAC module C228b-12, circuit CH244 (GY), harness side and auxiliary temperature blend door actuator C3004-5, circuit CH244 (GY), harness side.
- Measure the resistance between HVAC module C228b-13, circuit CH245 (BU/BN), harness side and auxiliary temperature blend door actuator C3004-6, circuit CH245 (BU/BN), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to T16.
No
REPAIR the circuit(s) for an open. TEST the system for normal operation.
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T5 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Measure the resistance between HVAC module C228b-12, circuit CH244 (GY), harness side and HVAC module C228b-13, circuit CH245 (BU/BN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to T16.
No
REPAIR circuit(s) for a short together. TEST the system for normal operation.
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T6 CHECK CIRCUIT VHA09 (VT/BN) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Measure the resistance between ground and HVAC module C228b-18, circuit VHA09 (VT/BN), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to T7.
No
REPAIR circuit VHA09 (VT/BN) for a short to ground. TEST the system for normal operation.
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T7 CHECK CIRCUIT RH111 (GY/BU) FOR A SHORT TO CIRCUIT VHA09 (VT/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: Auxiliary Temperature Blend Door Actuator C3004.
- Measure the resistance between HVAC module C228a-10, circuit RH111 (GY/BU), harness side and HVAC module C228b-18, circuit VHA09 (VT/BN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to T16.
No
REPAIR circuit(s) for a short together. TEST the system for normal operation.
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T8 CHECK CIRCUIT VHA09 (VT/BN) 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 C228b-18, circuit VHA09 (VT/BN), harness side.
- Is any voltage present?
Yes
REPAIR circuit VHA09 (VT/BN) for a short to voltage. TEST the system for normal operation.
No
GO to T9.
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T9 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO CIRCUIT VHA09 (VT/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.
- Ignition OFF.
- Disconnect: Auxiliary Temperature Blend Door Actuator C3004.
- Measure the resistance between HVAC module C228a-11, circuit LH111 (BN/WH), harness side and HVAC module C228b-18, circuit VHA09 (VT/BN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to T10.
No
REPAIR circuit(s) for a short together. TEST the system for normal operation.
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T10 CHECK CIRCUIT VHA09 (VT/BN) FOR AN OPEN
- Measure the resistance between HVAC module C228b-18, circuit VHA09 (VT/BN), harness side and auxiliary temperature blend door actuator C3004-2, circuit VHA09 (VT/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to T11.
No
REPAIR circuit VHA09 (VT/BN) for an open. TEST the system for normal operation.
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T11 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 auxiliary temperature blend door actuator C3004-3, circuit RH111 (GY/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to T12.
No
REPAIR circuit RH111 (GY/BU) for an open. TEST the system for normal operation.
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T12 CHECK CIRCUIT LH111 (BN/WH) FOR AN OPEN
- Measure the resistance between HVAC module C228a-11, circuit LH111 (BN/WH), harness side and auxiliary temperature blend door actuator C3004-1, circuit LH111 (BN/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to T16.
No
REPAIR circuit LH111 (BN/WH) for an open. TEST the system for normal operation.
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T13 CHECK CIRCUIT VHA15 (YE/GY) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Auxiliary Climate Control Assembly C3198.
- Disconnect: HVAC Module C228b.
- Measure the resistance between ground and HVAC module C228b-14, circuit VHA15 (YE/GY), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new auxiliary climate control assembly. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the blower motor still operates incorrectly, GO to T17.
No
REPAIR circuit VHA15 (YE/GY) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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T14 CHECK CIRCUIT VHA15 (YE/GY) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Auxiliary Climate Control Assembly C3198.
- Disconnect: HVAC Module C228b.
- Ignition ON.
- Measure the voltage between ground and HVAC module C228b-14, circuit VHA15 (YE/GY), harness side.
- Is any voltage present?
Yes
REPAIR circuit VHA15 (YE/GY) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to T15.
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T15 CHECK CIRCUIT VHA15 (YE/GY) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between HVAC module C228b-14, circuit VHA15 (YE/GY), harness side and auxiliary climate control assembly C3198-3, circuit VHA15 (YE/GY), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new auxiliary climate control assembly. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the condition returns, GO to T17.
No
REPAIR circuit VHA15 (YE/GY) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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T16 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 Auxiliary Temperature Blend Door Actuator component test. If the actuator tests OK, GO to T17. Auxiliary Temperature 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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T17 CHECK MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Carry out the HVAC Module 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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