Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2011TAHOE BASE, 5.3 0, 4WDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTINFOTAINMENTCELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESONSTAR GLOBAL POSITIONING SYSTEM (GPS) DATA NOT CURRENT OR INACCURATECIRCUIT/SYSTEM TESTING
2011 Chevrolet Tahoe Base, 5.3 0, 4WD
Circuit/System Testing
2011 Chevrolet Tahoe Base, 5.3 0, 4WDSECTION Circuit/System Testing
- Ignition OFF, disconnect the GPS and cell coax cable connector at the vehicle communication interface module.
- Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 kit to the vehicle communication interface module, place the test antenna on the roof of the vehicle.
- 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 vehicle communication interface module.
- Reconnect the coax cable to the vehicle communication interface module. Disconnect the coax cable from the navigation antenna.
- Test for 4.5-5.5 V between the coax cable center conductor and the outer shield.
- If not within the specified range, replace the coax cable.
- If all circuits test normal, replace the navigation antenna.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.