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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> Air Conditioning Compressor Malfunction >> Circuit/System Verification

Circuit/System Verification

NOTE:

Refer to HVAC System Malfunction  before performing this procedure.

  1. Ignition ON, press and release the A/C Switch.
  2. Verify the HVAC control module scan tool A/C Switch parameter changes between Active and Inactive.
    • If the parameter does not change 

      Replace the A26 HVAC Controls.

    • If the parameter changes 
  3. Set A/C system to coolest setting with blower ON.
  4. Press and release the A/C switch several times.
  5. Verify the ECM scan tool A/C Request Signal parameter changes between Active and Inactive.
    • If the parameter does not change 

      Replace the K33 HVAC Control Module.

    • If the parameter changes 
  6. Verify the A/C compressor clutch engages and disengages when commanding the ECM A/C Relay output function On and Off with a scan tool.
    • If the A/C compressor clutch engages and disengages as commanded 
  7. Engine ON.
  8. Verify the HVAC control module scan tool A/C Compressor Refrigerant Solenoid Valve Command parameter changes with varying cooling loads.
    • If the parameter does not change 

      Refer to DTC B393B 

    • If the parameter does change 
  9. All OK.
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