Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
ATC Bi-Level Switch Failure
2002 Chrysler 300M BaseSECTION ATC Bi-Level Switch Failure
NOTE:
After making any repairs, perform BODY VERIFICATION TEST
under VERIFICATION TESTS.
Monitored & Set Condition
- When Monitored: With the ignition on.
- Set Condition: The BCM interfaces with the ATC head over the PCI Bus. If any ATC switch is held in the closed position for longer than 5-10 minutes, a switch failed code will be set.
Possible Causes:
- ATC Head Switch Stuck
- ATC Head - Erase DTC - Reset
Testing
- Turn ignition on. With the scan tool select Automatic Temp Control, Input/Output and observe the switch state. If any of the switch states read CLOSED, replace the automatic temperature control head. See AUTOMATIC A/C-HEATER SYSTEMS - CONCORDE, INTREPID & 300M article in HVAC. If any of the switch states do not read CLOSED, use the scan tool to erase the trouble code and reset the module using scan tool.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.