Circuit/System Testing

WARNING: This page is about a different car, the 2014 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The global positioning system (GPS) requires a clear line of sight to the sky to operate properly. It may take up to 15 minutes for the Nav Radio to acquire a GPS signal. In most cases the GPS will not have reception near tall buildings or inside structures.

Ignition OFF, disconnect the GPS and cellular coax cable connector at the K73 Telematics Communication Interface Control Module.
Using the EL-49903 OnStar Antenna Diagnostic Tool Kit, connect the EL-49903-3 antenna to the K73 telematics communication interface module. Place the test antenna on the roof of the vehicle, ignition ON.
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
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
Test or replace the T4G Cellular Phone, Navigation, and Digital Radio Antenna.