Circuit/System Testing

without Navigation Radio

1. Ignition OFF, disconnect the GPS and cellular coax cable connector at the K73 Telematics Communication Interface Control Module.
2. Using the EL-49903  OnStar Antenna Diagnostic Tool Kit , connect the EL-49903-3 antenna to the K73 Telematics Communication Interface Control Module. Place the test antenna on the roof of the vehicle, ignition ON.
3. Verify that an OnStar advisor can locate the vehicle after performing a blue button press.
   • If the advisor can not locate the vehicle 

     Replace the K73 Telematics Communication Interface Control Module.

   • If the advisor can locate the vehicle 
4. Test the coax cable between the K73 Telematics Communication Interface Control Module and the T4G Cellular Phone, Navigation, and Digital Radio Antenna. Refer to component testing .
   • If the coax cable does not pass the test 

     Replace the coax cable.

   • If the coax cable passes the test 
5. Test or replace the T4G Cellular Phone, Navigation, and Digital Radio Antenna.

with Navigation Radio

NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the T4G Cellular Phone, Navigation, and Digital Radio Antenna coax cable at the T15 Navigation Antenna Signal Splitter.
2. Using the EL-49903  OnStar Antenna Diagnostic Tool Kit , connect the EL-49903-3 antenna to the T15 Navigation Antenna Signal Splitter. Place the test antenna on the roof of the vehicle, ignition ON.
3. Verify that an OnStar advisor can not locate the vehicle after performing a blue button press.
   • If the advisor can locate the vehicle 
   1. Test the coax cable between the T15 Navigation Antenna Signal Splitter and the T4G Cellular Phone, Navigation, and Digital Radio Antenna. Refer to Component Testing .
      • If the coax cable does not pass the test

        Replace the coax cable.

      • If the coax cable passes the test
   2. Replace the T4G cellular phone, navigation and digital radio antenna.
   • If the advisor can not locate the vehicle 
4. Ignition OFF, disconnect the GPS and cellular coax cable connector at the K73 Telematics Communication Interface Control Module.
5. Using the EL-49903  OnStar Antenna Diagnostic Tool Kit , connect the EL-49903-3 antenna to the K73 Telematics Communication Interface Control Module. Place the test antenna on the roof of the vehicle, ignition ON.
6. Verify that an OnStar advisor can locate the vehicle after performing a blue button press.
   • If the advisor can not locate the vehicle. 

     Replace the K73 Telematics Communication Interface Control Module.

   • If the advisor can locate the vehicle. 
7. Ignition OFF.
8. Test the coax cable between the T15 Navigation Antenna Signal Splitter and the K73 Telematics Communication Interface Control Module. Refer to Component Testing .
   • If the coax cable does not pass the test. 

     Replace the coax cable.

   • If the coax cable passes the test. 
9. Ignition OFF, disconnect the GPS coax cable at the A11 Radio.
10. Connect the EL-49903  OnStar Antenna Diagnostic Tool Kit to the A11 Radio and place the test antenna on the roof of the vehicle.
11. Ignition ON.
12. Verify that the NO GPS symbol/message is not displayed on the A11 Radio.
    • If the NO GPS symbol/message is displayed 

      Replace the A11 Radio

    • If the NO GPS symbol/message is not displayed. 
13. Ignition OFF.
14. Test the coax cable between the T15 Navigation Antenna Signal Splitter and the A11 Radio. Refer to Component Testing .
    • If the coax cable does not pass the test. 

      Replace the coax cable.

    • If the coax cable passes the test. 
15. Test or replace the T15 Navigation Antenna Signal Splitter.