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B1050–BLEND DOOR TRAVEL RANGE TOO SMALL For a complete wiring diagram Refer to Section 8W. Theory of Operation The A/C Heater Control calibrates each actuator individually. Automatic calibration occurs upon power up after • When Monitored: • Set Condition: Possible Causes DOOR DRIVER ELECTRICAL CIRCUIT(S) BLEND DOOR SEIZED, BINDING, OBSTRUCTED BLEND DOOR ACTUATOR 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 CIR- 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 THE ACTUATOR DTC DETECTION TEST With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is com- Does the scan tool display any DTCs? Yes >> Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common circuit, diag- nose and repair all short high DTCs first, all short low DTCs second, and all open DTCs last. Refer to No >> Go To 3 24 - 78 HVAC - ELECTRICAL DIAGNOSTICS ND |