B10A8–LEFT BLEND DOOR ACTUATOR PERFORMANCE (ATC)

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

The A/C Heater Control monitors the door driver circuits during actuator operation for conditions that prevent proper door operation. If a pulse count error is detected the A/C Heater Control reports the fault as a Actuator Performance DTC. It is important to note that this DTC only indicates that a fault occurred while driving a door actuator and that additional 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 a pulse count error while attempting to drive this door actuator.

Possible Causes

DOOR DRIVER CIRCUIT(S) SHORTED HIGH, SHORTED LOW, SHORTED TOGETHER, OPEN

DOOR ACTUATOR(S) BINDING, BROKEN

DOOR ACTUATOR(S) LINKAGE BINDING, DISCONNECTED, MISSING, BROKEN

A/C HEATER CONTROL

Diagnostic Test

1.CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs

Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs?

Yes

Diagnose and repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of HVAC related symptoms.

Go To 2

2.RUN ACTUATOR CALIBRATION TEST

Does the scan tool display any DTCs?

Yes

Diagnose and repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of HVAC related symptoms.

Go To 3

3.CHECK MODE, BLEND & RECIRCULATION DOOR OPERATION

Does each door operate properly?

Yes

The condition causing the fault has cleared at this time.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Remove the door actuator of the affected door from the A/C Heater Housing Assembly. By hand, attempt to rotate the actuator in both directions. Inspect the A/C Heater Housing for damage, for disconnected, missing, or broken linkage, and for broken or binding doors. Repair as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).