B1058

B1058-RECIRCULATION DOOR CONTROL CIRCUIT/PERFORMANCE

For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

Theory of Operation

The A/C Heater Control monitors the door driver circuits during actuator operation for shorts to ground, shorts to battery, and shorts to other door driver circuits. If detected, the A/C Heater Control reports these types of faults as Control Circuit/Performance DTCs. It is important to note that Control Circuit/Performance DTCs do not indicate where or what type of short is present and that additional system testing is necessary to provide more details about the reported fault.

- When Monitored:
When actuator movement is requested.

- Set Condition:
If the A/C Heater Control detects an excessive current draw on any of the door driver circuits while attempting to drive this actuator. This Diagnostic Trouble Code (DTC) has a maturing time of five seconds and a de-maturing time of 10 seconds. If the DTCs status changes from active to stored it will stay in memory for 100 ignition cycles.





NOTE: The DTC must be active for the results of this test to be valid. Do not perform this test if the DTC is stored. Perform the HVAC System Test for stored DTC test procedures. HVAC System Test
RUN THE ACTUATOR DTC DETECTION TEST
1. Turn the ignition on.
2. With the scan tool in HVAC, erase DTCs.
3. With the scan tool, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs.



Repair, Dual-Zone System

- Testing and Inspection to diagnose and repair the other DTCs. If multiple DTCs are present, beginning with the common circuit, diagnose and repair all short high DTCs and then all short low DTCs.

Repair, Single-Zone System

- Testing and Inspection to diagnose and repair the other DTCs. If multiple DTCs are present, beginning with the common circuit, diagnose and repair all short high DTCs and then all short low DTCs.