Mode Door Output Shorted To Ground

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.

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 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:

Mode Door Driver Circuit Short To Ground
Mode Door Driver CKT Short To Sensor Ground
Mode Door Driver Wire Short To Sensor Ground
Mode Door Actuator

Testing

Turn all lights off. Close the driver door latch to turn courtesy lights off. Disconnect BCM C1 harness connector. See Figure . Measure the resistance between ground and the mode door driver circuit. If the resistance is 5 ohms or less, repair the mode 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 mode 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 mode door actuator harness connector. Measure the resistance between the mode door driver circuit and the sensor ground circuit in the BCM C1 connector. If the resistance is 5 ohms or less, repair the mode door driver circuit for a short to the sensor ground circuit. If the resistance is 5 ohms or more, replace the mode door actuator. See MODE DOOR ACTUATOR under REMOVAL & INSTALLATION.