Pinpoint Test U: The Auxiliary Panel/Floor Control Is Inoperative/Does Not Operate Correctly Using The Front/Rear Auxiliary Cli
Climate Control System
Pinpoint Tests
Pinpoint Test U: The Auxiliary Panel/Floor 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 panel/floor door actuator through circuit CH243 (GY/BU), and supplies ground or voltage through circuit CH242 (VT/BN) depending on desired rotation direction.
The auxiliary panel/floor 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 panel/floor door actuator feedback circuit VHA18 (YE/GN) to determine the auxiliary panel/floor door actuator position by the position of the actuator feedback resistor wiper arm.
B1B7D:11-B121D:15:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Auxiliary panel/floor door actuator
- HVAC module
- Auxiliary climate control assembly
- Stuck or bound linkage or door
PINPOINT TEST U: THE AUXILIARY PANEL/FLOOR CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY USING THE FRONT/REAR AUXILIARY CLIMATE CONTROLS
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U1 CHECK THE HVAC MODULE FOR DTCs
- Ignition ON.
- Check the HVAC module for DTCs.
- Are DTCs present?
Yes
For DTC B11E4:07, 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 B11E4:11, GO to U2.
For DTC B11E4:12, GO to U3.
For DTC B11E4:13, GO to U4.
For DTC B1B7D:11, GO to U6.
For DTC B1B7D:15, GO to U8.
For DTC B121D:11, GO to U13.
For DTC B121D:15, GO to U14.
No
INSPECT for broken linkage or door. REPAIR as necessary. If no condition is found, GO to U16.
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U2 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 Mode Door Actuator C3044.
- Measure the resistance between ground and:
- HVAC module C228b-10, circuit CH242 (VT/BN), harness side.
- HVAC module C228b-11, circuit CH243 (GY/BU), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to U5.
No
REPAIR the circuit(s) for a short to ground. TEST the system for normal operation.
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U3 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 Mode Door Actuator C3044.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module C228b-10, circuit CH242 (VT/BN), harness side.
- HVAC module C228b-11, circuit CH243 (GY/BU), 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 U5.
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U4 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 Mode Door Actuator C3044.
- Measure the resistance between HVAC module C228b-10, circuit CH242 (VT/BN), harness side and auxiliary mode door actuator C3044-5, circuit CH242 (VT/BN), harness side.
- Measure the resistance between HVAC module C228b-11, circuit CH243 (GY/BU), harness side and auxiliary mode door actuator C3044-6, circuit CH243 (GY/BU), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to U16.
No
REPAIR the circuit(s) for an open. TEST the system for normal operation.
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U5 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Measure the resistance between HVAC module C228b-10, circuit CH242 (VT/BN), harness side and HVAC module C228b-11, circuit CH243 (GY/BU), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to U16.
No
REPAIR circuit(s) for a short together. TEST the system for normal operation.
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U6 CHECK CIRCUIT VHA18 (YE/GN) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Measure the resistance between ground and HVAC module C228b-19, circuit VHA18 (YE/GN), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to U7.
No
REPAIR circuit VHA18 (YE/GN) for a short to ground. TEST the system for normal operation.
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U7 CHECK CIRCUIT RH111 (GY/BU) FOR A SHORT TO CIRCUIT VHA18 (YE/GN)
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 Mode Door Actuator C3044.
- Measure the resistance between HVAC module C228a-10, circuit RH111 (GY/BU), harness side and HVAC module C228b-19, circuit VHA18 (YE/GN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to U16.
No
REPAIR circuit(s) for a short together. TEST the system for normal operation.
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U8 CHECK CIRCUIT VHA18 (YE/GN) 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-19, circuit VHA18 (YE/GN), harness side.
- Is any voltage present?
Yes
REPAIR circuit VHA18 (YE/GN) for a short to voltage. TEST the system for normal operation.
No
GO to U9.
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U9 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO CIRCUIT VHA18 (YE/GN)
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 Mode Door Actuator C3044.
- Measure the resistance between HVAC module C228a-11, circuit LH111 (BN/WH), harness side and HVAC module C228b-19, circuit VHA18 (YE/GN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to U10.
No
REPAIR circuit(s) for a short together. TEST the system for normal operation.
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U10 CHECK CIRCUIT VHA18 (YE/GN) FOR AN OPEN
- Measure the resistance between HVAC module C228b-19, circuit VHA18 (YE/GN), harness side and auxiliary mode door actuator C3004-2, circuit VHA18 (YE/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to U11.
No
REPAIR circuit VHA18 (YE/GN) for an open. TEST the system for normal operation.
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U11 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 mode door actuator C3044-3, circuit RH111 (GY/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to U12.
No
REPAIR circuit RH111 (GY/BU) for an open. TEST the system for normal operation.
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U12 CHECK CIRCUIT LH111 (BN/WH) FOR AN OPEN
- Measure the resistance between HVAC module C228a-11, circuit LH111 (BN/WH), harness side and auxiliary mode door actuator C3044-1, circuit LH111 (BN/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to U16.
No
REPAIR circuit LH111 (BN/WH) for an open. TEST the system for normal operation.
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U13 CHECK CIRCUIT CHA34 (YE/BU) 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-9, circuit CHA34 (YE/BU), 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 U17.
No
REPAIR circuit CHA34 (YE/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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U14 CHECK CIRCUIT CHA34 (YE/BU) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Auxiliary Mode Door Actuator C3044.
- Disconnect: HVAC Module C228b.
- Ignition ON.
- Measure the voltage between ground and HVAC module C228b-9, circuit CHA34 (YE/BU), harness side.
- Is any voltage present?
Yes
REPAIR circuit CHA34 (YE/BU) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to U15.
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U15 CHECK CIRCUIT CHA34 (YE/BU) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between HVAC module C228b-9, circuit CHA34 (YE/BU), harness side and auxiliary climate control assembly C3198-2, circuit CHA34 (YE/BU), 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 U17.
No
REPAIR circuit CHA34 (YE/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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U16 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 mode door actuator component test. If the actuator tests OK, GO to U17. Component Tests and General Diagnostics
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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U17 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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