LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 244 (Cellular Systems, Entertainment Systems & Navigation Systems) >> Diagnostic Information and Procedures >> DTC B2462 (Communication Interface Module) >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2010 GMC Yukon XL, 2010 GMC Yukon, 2010 Chevrolet Tahoe, 2010 Chevrolet Suburban, and 2010 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  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. See Special Tools .
  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.
scientia non olet · About LEMON Manuals