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Home >> Chevrolet >> 2013 >> Volt >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Unable to Contact OnStar Call Center >> Circuit/System Testing (without Navigation Radio)

Circuit/System Testing (without Navigation Radio)

WARNING: This page is about a different car, the 2011 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.
  1. Ignition OFF, disconnect the GPS and cellular coax cable connector at the K73 telematics communication interface control module.
  2. Using the EL-49903-3 kit (EL-499035 adapter and EL-49903-4 coax cable), connect the EL-49903  to the K73 telematics communication interface control module. See Special Tools .
  3. 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 K73 telematics communication interface module.
  4. Ignition OFF, disconnect the EL-49903  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. See Special Tools .
    • If the coax cable does not pass the test, replace the coax cable.
  5. If all circuits test normal, replace the T4G cellular phone and navigation antenna.
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