A/C Control Blend Door Input Open or Shorted to Ground

NAME OF CODE
A/C Control Blend Door Input Open or Shorted to Ground (manual HVAC only)

WHEN MONITORED
With ignition on

SET CONDITION
BCM detects an abnormally low voltage on its blend request input

THEORY OF OPERATION
The BCM reads the signal from the manual HVAC head blend request and positions the blend door accordingly. If the voltage on this pin is too low (below 0.1 V), this fault will be set and the BCM will place the blend door in a default position.

PROBABLE CAUSES
- Temperature select circuit open
- Temperature select circuit shorted to ground
- Manual HVAC head failure
- BCM failure