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Home >> Cadillac >> 2019 >> CTS Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B125B >> Circuit/System Verification
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Circuit/System Verification

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the antenna located in the rear window. Verify all branches of the antennas are intact, with no scratches or other damage.
    • If damage is found 

      Repair or replace as necessary

    • Go to next step: If no damage is found 
  2. Ignition ON, infotainment system ON.
  3. Verify station reception is normal when tuned to several known good AM and FM stations.
    • If AM or FM reception is poor. 

      Refer to Circuit/System Testing

    • Go to next step: If reception is normal 
  4. All OK.
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