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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 493 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B1023 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON
  2. Verify DTC B1023 is not set.
    • If DTC B1023 is set 
    1. Program the K33 HVAC control module.
    2. Verify the DTC does not set.
      • If the DTC sets, replace the K33 HVAC control module.
      • If the DTC does not set
    3. All OK
    • If DTC B1023 is not set 
  3. All OK
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