Circuit/System Testing
- Ignition OFF, disconnect the navigation antenna coax cable connector at the K74 Human Machine Interface Control Module. Connect the EL-49903 GM OnStar® antenna diagnostic tool kit to the K74 Human Machine Interface Control Module, place the test antenna on the roof of the vehicle.
- Ignition ON, infotainment system ON, navigation selected.
- Verify DTC B2462 is not set.
- If DTC B2462 is set
Replace the K74 Human Machine Interface Control Module.
- If DTC B2462 is not set
- If DTC B2462 is set
- Ignition OFF, disconnect the radio navigation coax cable at the T4G Navigation Antenna.
- Verify the radio navigation coax cable passes the coax cable component test. Refer to Component Testing .
- If the coax cable does not pass the test
Replace the coax cable
- If the coax cable passes the test
- If the coax cable does not pass the test
- Test or replace the T4G Navigation Antenna.