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B10AF–RIGHT 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 • When Monitored: • Set Condition: 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 Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL Yes >> Diagnose and repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of all HVAC related symptoms. No >> Go To 2 2. RUN ACTUATOR CALIBRATION TEST With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select 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 all HVAC related symptoms. No >> Go To 3 24 - 162 HVAC - ELECTRICAL DIAGNOSTICS LX |