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Home >> Chevrolet >> 2012 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 395 (HVAC System - Manual) >> Diagnostic Information and Procedures >> DTC B1023: Integral Switch Performance >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, disconnect the harness connector at the auxiliary HVAC control module, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC Control Module.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the HVAC Control Module.
  2. Reprogram the HVAC control module that set DTC B1023. The module should successfully reprogram.
    • If the module will not reprogram, replace the HVAC control module that set the DTC.
  3. With a scan tool, clear the DTC.
  4. Ignition OFF.
  5. Wait 60 seconds, then recheck for DTCs. DTC B1023 should not set.
    • If DTC B1023 sets, replace the module.
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