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Home >> Hummer >> 2010 >> H3 Alpha >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular, Entertainment, And Navigation >> Diagnostic Information and Procedures >> DTC B2462 (Communication Interface Module) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect both the GPS and cell coax cable connectors at the K73 telematics communication interface control module.
  2. Connect the EL-49903  to the K73 telematics communication interface control module, place the test antenna on the roof of the vehicle.
  3. Ignition ON, wait 5 minutes, then contact the OnStar call center consultant by pressing the blue OnStar button. A call center consultant should answer the call, ask the consultant to verify the vehicle location to confirm the GPS system is functioning.
    • If the OnStar GPS does not function, replace the K73 telematics communication interface module.
  4. Ignition OFF, perform the coax cable test on the coax cable, refer to Component Testing. The coax cable should pass the test.
    • If the coax cable does not pass the test, replace the coax cable.
  5. If all circuits test normal, replace the T4 cellular phone and navigation antenna.
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