B11CB-11-MAIN/LEFT TEMPERATURE DOOR CONTROL - CIRCUIT SHORT TO GROUND
B11CB-11-MAIN/LEFT TEMPERATURE DOOR CONTROL - CIRCUIT SHORT TO GROUND
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For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
After the initial installation of the A/C Heater Control, the controller is calibrated to each individual blend/mode door actuator. These calibrations are stored as in the number of pulses it takes to move the door from one stop to another. The A/C Heater Control drives the Door Actuators by the use of Door Driver circuit and a Common Door Driver circuit and monitors all door actuator pulses to detect door movement in both directions. Most of the door actuators share a common door driver circuit but each door actuator has its own unique driver circuit. Due to shared circuitry, similar Diagnostic Trouble Codes (DTCs) can set at the same time for multiple actuators depending upon the type of circuit malfunction, its location, and the direction the actuator is moving when the malfunction is present. For further information (Refer to 24 - Heating and Air Conditioning/Controls/ACTUATOR, Blend Door - Operation) .
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When Monitored:
Continuously with the ignition on.
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Set Condition:
The A/C Heater Control detects a short to ground on the Blend Door control circuit. If the A/C Heater Control detects valid current draw, the DTC will change from Active to Stored and will stay in the controllers memory for 100 ignition cycles.
Possible Causes |
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| (C61) BLEND DOOR DRIVER CIRCUIT SHORTED TO GROUND |
| (C34) COMMON DOOR DRIVER CIRCUIT SHORTED TO GROUND |
| BLEND DOOR ACTUATOR |
| A/C HEATER CONTROL |
Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
| 1. | Ignition on, engine not running. |
| 2. | Using the scan tool, read HVAC DTCs. |
Is this DTC active?
Yes
- Go To 3
No
- Go To 2
2. PERFORM HVAC ACTUATOR CALIBRATION TEST
| 1. | Using the scan tool, perform the HVAC Actuator Calibration Test. |
Did this DTC change from Stored to Active while performing the HVAC Actuator Calibration Test?
Yes
- Go To 3
No
- Go To 6
3. CHECK THE (C61) BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
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| 1. | Turn the ignition off to the lock position. |
| 2. | Disconnect the A/C Heater Control C1 harness connector. |
| 3. | Disconnect the Blend Door Actuator harness connector. |
| 4. | Measure the resistance between ground and the (C61) Blend Door Driver circuit. |
Is the resistance below 100k Ohms?
Yes
- Repair the (C61) Blend Door Driver circuit for a short to ground.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
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Go To 4
4. CHECK THE (C34) COMMON DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
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| 1. | Measure the resistance between ground and the (C34) Common Door Driver circuit. |
Is the resistance below 100k Ohms?
Yes
- Repair the (C34) Common Door Driver circuit for a short to ground.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
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Go To 5
5. CHECK THE BLEND DOOR ACTUATOR
| 1. | Replace the Blend Door Actuator in accordance with the Service Information. (Refer to 24 - Heating and Air Conditioning/Controls/ACTUATOR, Blend Door - Removal) . |
| 2. | Using the scan tool, erase HVAC DTCs and perform the HVAC Actuator Calibration Test. |
Did this DTC reset?
Yes
- Replace and program the A/C Heater Control in accordance with the Service Information. (Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal) .
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
- Test complete.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
6. CHECK THE WIRING AND CONNECTORS
| 1. | The conditions necessary to set the DTC are not present at this time. |
| 2. | Using the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. |
| 3. | Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. |
| 4. | Wiggle the wiring and connectors while checking for shorted and open circuits. |
Were there any problems found?
Yes
- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No