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*HVAC SYSTEM TEST For the Manual Temperature Control (MTC) circuit diagrams (Refer to 24 - HEATING & AIR CONDITIONING - For a complete wiring diagram Refer to Section 8W. Theory of Operation The HVAC System Test provides a starting point in the diagnostic process by identifying the appropriate diagnostic Diagnostic Test 1. HVAC SYSTEM TEST NOTE: Diagnose and repair all active DTCs before diagnosing and repairing stored DTCs. Make a selection based on the symptom, condition, or DTC that you want to diagnose. For Any Active DTC Refer to the Table of Contents in this Section for a complete list of all HVAC related symptoms. DRBIII T Displays No Response From HVAC (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for no A/C Status Indicator Flashing Go To 2 A/C Status Indicator Will Not Illuminate (Vehicles w/o EBL) Refer to *A/C Status Indicator Will Not Illuminate — A/C Heater Control Without EBL Switch in this sec- EBL Status Indicator Flashing Go To 5 Blower Motor Inoperative Refer to *Blower Motor Inoperative in this section for the diagnostic test procedure. A/C Heater Control Illumination Inoperative Refer to *A/C Heater Control Illumination Inoperative in this section for the diagnostic test procedure. Complete HVAC System Test Go To 2 A/C System Performance Test Go To 2 General System Operation & Function Test Go To 3 Actuator Circuit Test Go To 4 HVAC Door Recalibration Go To 5 24 - 184 HVAC - ELECTRICAL DIAGNOSTICS DR/DH |