Blend Door Output Shorted To Ground
NOTE:
After making any repairs, perform BODY VERIFICATION TEST
under VERIFICATION TESTS.
NOTE:
After repair or replacement is completed, calibration must be performed. See AUTOMATIC A/C-HEATER SYSTEMS - CONCORDE, INTREPID & 300M
article or MANUAL A/C-HEATER SYSTEMS - CONCORDE & INTREPID
article in HVAC.
Monitored & Set Condition
- When Monitored: Whenever the BCM attempts to move one of the HVAC actuators.
- Set Condition: When the BCM detects one or more of the following outputs shorted to ground; mode door driver, blend door driver, recirculation door driver or the common door driver.
Possible Causes:
- Blend Air Door Driver Circuit Short To Ground
- Blend Air Door Driver CKT Short To Sensor Ground
- Blend Air Door Driver Wire Short To Sensor Ground
- Blend Door Actuator
Testing
- Turn all lights off. Close the driver door latch to turn courtesy lights off. Disconnect the BCM C1 harness connector. See Figure . Measure the resistance between ground and the blend air door driver circuit. If the resistance is 5 ohms or less, repair the blend air door driver circuit for a short to ground. If the resistance is 5 ohms or more, go to next step.
- Measure the resistance between the blend air door driver circuit and the sensor ground circuit in the BCM C1 connector. If the resistance is 5 ohms or less, go to next step. If the resistance is 5 ohms or more, replace the BCM. See BODY CONTROL MODULE under REMOVAL & INSTALLATION.
- Disconnect the blend door actuator harness connector. See Figure . Measure the resistance between the blend air door driver circuit and the sensor ground circuit in the BCM C1 connector. If the resistance is 5 ohms or less, repair the blend air door driver circuit for a short to the sensor ground circuit. If the resistance is 5 ohms or more, replace the blend door actuator. See BLEND DOOR ACTUATOR under REMOVAL & INSTALLATION.