LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2015 >> CTS Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System, And Navigation System - Sedan >> Diagnostic Information and Procedures >> DTC B1446 or B1447: Replace Backup Power Source Below Minimum Threshold, Backup Power Source Open Circuit >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the X1 harness connector at the K73 Telematics Communication Interface Control Module. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for greater than 9.5 V between the B+ circuit terminal 14 and the low reference circuit terminal 13.
    • If 9.5 V or less 

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

    • If greater than 9.5 V 
  3. Replace the K73 Telematics Communication Interface Control Module.
scientia non olet · About LEMON Manuals