Common Output Shorted to Ground Trouble Code
NAME OF CODEMode Door Output Shorted to Ground
Blend Door Output Shorted to Ground
Recirc Door Output Shorted to Ground
Common Output Shorted to Ground
WHEN MONITORED
Whenever the BCM attempts to move one of the HVAC actuators.
SET CONDITION
BCM detects one or more of the following outputs shorted to ground: mode drive, blend drive recirc drive, or common drive.
THEORY OF OPERATION
When the BCM wants to actuate one of the doors (it only moves one at a time), it sets the door output to the appropriate level and sets the common output and the other two door outputs to the opposite level (ignition or ground). At this time it verifies that the output is doing what it should - if not, the fault is set
PROBABLE CAUSES
- Wiring short to ground
- Failed actuator
- Failed BCM