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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Cellular, Entertainment, And Navigation - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B13ED >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the FM2/DAB radio antenna coax cable from the A11 Radio and from the T35FB Radio Antenna Amplifier - FM2 or T35FD Radio Antenna Amplifier - FM2/DAB.
  2. Verify the antenna coax cable passes the coax cable component test. Refer to Component Testing.
    • If the coax cable does not pass the test 

      Replace the antenna coax cable

    • Go to next step: If the coax cable passes the test 
  3. Connect the radio antenna coax cable to the A11 Radio.
  4. Connect the appropriate pinout adaptor from EL-52552 COAX FAKRA Cable Adaptor Kit to the coax cable at the T35FB Radio Antenna Amplifier - FM2 or T35FD Radio Antenna Amplifier - FM2/DAB.
  5. Ignition ON, A11 Radio ON/vehicle in service mode, A11 Radio on.
  6. Verify a test lamp illuminates between the terminals at the pinout adaptor.
  7. Test for 9 V or greater between the terminals at the pinout adaptor.
    • If less than 9 V 

      Replace the A11 Radio.

    • Go to next step: If 9 V or greater 
  8. Test or replace the T35FB Radio Antenna Amplifier - FM2 or T35FD Radio Antenna Amplifier - FM2/DAB.
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