PINPOINT TEST H : The Air Inlet Door Is Inoperative: Notes

Refer to MANUAL CLIMATE CONTROL SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions 

Refer to CLIMATE CONTROL - EMTC , Air inlet Mode Door Actuator.

To rotate the air inlet mode door actuator, the HVAC module supplies voltage and ground to the air inlet mode door actuator through the door actuator motor circuits. To reverse the air inlet mode door actuator rotation, the HVAC module reverses the voltage and ground circuits.

The air inlet mode door actuator feedback resistors are supplied a ground from the HVAC module by the air inlet mode door actuator return circuits and a 5-volt reference voltage on the air inlet mode door actuator reference circuits. The HVAC module reads the voltage on the air inlet mode door actuator feedback circuits to determine the air inlet mode door actuator position by the position of the actuator feedback resistor wiper arm.

During an actuator calibration cycle, the HVAC module drives the air inlet mode door until the door reaches both internal stops in the HVAC case. If the air inlet mode door is temporarily obstructed or binding during a calibration cycle, the HVAC module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the air intake may not be from the expected source.

DTC Fault Trigger Conditions 

Possible Sources 

• Wiring, terminals or connectors
• Air inlet mode door actuator
• Air inlet mode door binding or stuck
• HVAC module
• FCIM