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Home >> GMC >> 2018 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 331 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1446 or B1447: Backup Power Source (UE3) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON/vehicle in Service Mode
  2. Verify DTC B1446 is not set in the Telematics Communication Interface Control Module
    • If DTC B1446 is set 

      Replace the C3 Telematics Communication Interface Control Module Battery

  3. Verify DTC B1446 is not set in the Telematics Communication Interface Control Module
    • If DTC B1446 is set 

      Replace the K73 Telematics Communication Interface Control Module

    • If DTC B1446 is not set 
  4. All OK
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