HVAC Control Input Shorted to Ground

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SYMPTOM
HVAC CONTROL INPUT SHORTED TO GROUND

WHEN MONITORED
With the ignition key on and battery voltage greater than 10 volts.

SET CONDITION
The HVAC control head input (HVAC mode sense circuit) voltage is less than 0.4 volts for 10 consecutive seconds.

POSSIBLE CAUSES
- BCM HVAC failure pretest
- HVAC control input shorted to ground
- Mode door driver (+) circuit short to B+
- Mode door driver (-) circuit short to ground
- Mode door driver (-) circuit short to B+
- HVAC mode sense circuit short to ground
- Mode door actuator drive defective
- HVAC control head defective
- BCM - mode door driver defective