Automatic Temperature Control Head Switches

NAME OF CODE
ATC A/C Switch Failed
ATC Floor Switch Failed
ATC Auto Switch Failed
ATC Mix Switch Failed
ATC Bi-level Switch Failed
ATC Off Switch Failed
ATC Defrost Switch Failed
ATC Panel Switch Failed
ATC EBL Switch Failed
ATC Recirculation Switch Failed
ATC Temperature Down Switch Failed
ATC Temperature Switch Up Switch Failed

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

SET CONDITION
The BCM interfaces with the A/C control head over the PCI bus. If an ATC switch is held in the closed position for longer than 5-10 minutes, a switch failed code will be set.

POSSIBLE CAUSES
- ATC control head
- Stuck switch