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Circuit/System Verification

WARNING: This page is about a different car, the 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
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 engine control module (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 when commanding the engine control module (ECM) A/C Relay output function On and Off with a scan tool.
    • If the A/C compressor clutch engages 
  7. All OK.
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