B1344

Diagnostic Trouble Code Chart (Part 1 Of 2):

Diagnostic Trouble Code Chart (Part 2 Of 2):

Wiring Schematic:

CIRCUIT DESCRIPTION
The rear junction block supplies ignition voltage through circuit 141 (BRN). The HCM commands the actuator to move by supplying voltage on the command line circuit 1318 (YEL). The command line voltage and motor actions are as follows:
^ 0 volts moves toward full hot.
^ 2.5 volts stops the motor.
^ 5 volts moves toward full cold.

The HCM determines the current position by monitoring the voltage on the feedback circuit 1814 (YEL/BLK). A feedback potentiometer supplies a regulated 5 volt signal by the HCM on circuit 705 (GRY), and a ground from the HCM circuit 1791 (YEL). The pot is gear driven inside the actuator. The feedback voltage is a function of the motor position with a high voltage of 4-5 volts indicating full cold door position. A low voltage of less then 1 volt indicates the full hot position. Operation of the air mix door actuator can be evaluated through Scan Tool data.

CONDITIONS FOR SETTING THE DTC
^ Ignition is ON.
^ Feedback circuit is open or shorted.

ACTION TAKEN WHEN THE DTC SETS
^ A default value of 128 counts will be used by the HCM.
^ This default value results in only two positions of the actuator A/C and Defrost being used by the system.

CONDITIONS FOR CLEARING THE DTC
^ Using a Scan Tool.
^ A history DTC will clear when 40 consecutive ignition cycles have occurred without a malfunction.
^ HCM battery voltage is interrupted.
1. Perform the Body Control Module Diagnostic Symptom Check before continuing with the diagnosis of this DTC.
2. This test allows the Scan Tool to rattlebrained the actuator.
11. Determines if the HMC is malfunctioning.
14. Determines if the actuator is operational.