A/C Control Blend Door Input Shorted To Battery (Manual A/C)

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.

Monitored & Set Condition

When Monitored: With ignition on.
Set Condition: The BCM detects an abnormally high voltage on its blend request input.

Possible Causes:

Control Head - Short To Voltage
Temperature Select CKT Shorted To Voltage
Body Control Module - Temperature Select Short To Voltage

Testing

With the scan tool, erase BODY CONTROL DTC's. Turn ignition off. Disconnect the manual temp control head C1 harness connector. See Figure . Turn ignition on. Measure the voltage of the temperature select circuit. If the voltage is .3 volt or more, go to next step. If the voltage is .3 volt or less, replace the control head. See MANUAL A/C-HEATER SYSTEMS - CONCORDE & INTREPID article in HVAC.
Disconnect BCM C2 harness connector. See Figure . Turn ignition On. Measure the voltage of the temperature select circuit. If there is any voltage present, repair the temperature select circuit for a short to voltage. If no voltage is present, go to next step.
If there are no possible causes remaining, replace the BCM. See BODY CONTROL MODULE under REMOVAL & INSTALLATION.