Circuit/System Testing
WARNING: This page is about a different car, the 2017 GMC Acadia Limited, 2017 Chevrolet Traverse, and 2017 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax.
- Ignition OFF, disconnect the GPS and cellular coax cable connector at the VCIM.
- Using the EL-49903 - 3 kit (EL-49903 - 5 adapter and EL-49903 - 4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the VCIM.
- Ignition ON, wait 5 minutes, and then contact the OnStar call center consultant by pressing the blue OnStar button. A call center consultant should answer the call.
- If the unit does not connect to the OnStar Call Center, replace the VCIM.
- Ignition OFF, disconnect the EL-49903
GM OnStar antenna diagnostic tool kit EL-49903 from the VCIM and perform the coax cable test on the coax cable between the VCIM and the radio antenna.
- If the coax cable does not pass the test, replace the coax cable.
- If all circuits test normal, replace the radio antenna.