Circuit/System Testing

Active Antenna (U77)

1. Ignition OFF, disconnect the radio antenna coax cable from the A11 radio and from the T23R Radio Antenna Amplifier.
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

   • If the coax cable passes the test 
3. Connect the antenna coax cable to the A11 radio. Ignition ON, A11 radio ON.
4. Verify a test lamp illuminates between the antenna coax cable center terminal and ground at the T23R Radio Antenna Amplifier connector.
   • If the test lamp does not illuminate 

     Replace the A11 radio.

   • If the test lamp illuminates 
5. Test or replace the T23R Radio Antenna Amplifier.

Spoiler Antenna (UB3)

1. Ignition OFF, disconnect the radio antenna coax cable from the A11 radio and from the T23L Radio Antenna Amplifier.
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

   • If the coax cable passes the test 
3. Connect the antenna coax cable to the A11 radio. Ignition ON, A11 radio ON.
4. Verify a test lamp illuminates between the antenna coax cable center terminal and ground at the T23L Radio Antenna Amplifier connector.
   • If the test lamp does not illuminate 

     Replace the A11 radio.

   • If the test lamp illuminates 
5. Test or replace the T23L Radio Antenna Amplifier.