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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC B1446 Or B1447: Backup Power Source (IOU/IOS/IOT/IOR) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 GMC Terrain and 2018 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify DTC B1446/B1447 is not set.
    • If DTC B1446/B1447 is set 

      Test or replace the C3 Telematics Communication Interface Control Module Battery.

  2. Verify DTC B1446/B1447 is not set.
    • If DTC B1446/B1447 is set 

      Test or replace the K73 Telematics Communication Interface Control Module

    • Go to next step: If DTC B1446/B1447 is not set 
  3. All OK.
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