Circuit/System Testing (without Navigation Radio)
WARNING: This page is about a different car, the 2012 Chevrolet Volt. 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.
- Vehicle OFF, disconnect the GPS and cellular coax cable connector at the K73 telematics communication interface control module.
- 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 K73 telematics communication interface control module.
- Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC B2470 does not set.
- If the DTC sets, replace the K73 telematics communication interface control module.
- Vehicle OFF, disconnect the EL-49903
GM OnStar antenna diagnostic tool kit from the K73 telematics communication interface control module and perform the coax cable test on the coax cable between the K73 telematics communication interface control module and the T4G cellular phone, navigation, and digital radio antenna.
- If the coax cable does not pass the test, replace the coax cable.
- If all circuits test normal, replace the T4G cellular phone, navigation, and digital radio antenna.