Circuit/System Testing (with 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.
- Vehicle in Service Mode, 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 K73 telematics communication interface 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 T15 navigation antenna signal splitter.
- If the coax cable does not pass the test, replace the coax cable.
- Perform the coax cable test on the coax cable between the T15 navigation antenna signal splitter 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 coax cables pass the test, replace the T15 navigation antenna signal splitter, 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 T4G cellular phone, navigation, and digital radio antenna.