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 MANUALSCHEVROLET2022TRAILBLAZER LT, 1.3L ENG VIN L, FWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSCELLULAR, ENTERTAINMENT, AND NAVIGATION - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESNO GLOBAL POSITIONING SYSTEM (GPS) RECEPTIONCIRCUIT/SYSTEM TESTING
2022 Chevrolet Trailblazer LT, 1.3L Eng VIN L, FWD
Circuit/System Testing
2022 Chevrolet Trailblazer LT, 1.3L Eng VIN L, FWDSECTION Circuit/System Testing
- Ignition OFF, disconnect the GPS coax cable connector at the K73 Telematics Communication Interface Control Module.
- Connect the EL-49903 OnStar Antenna Diagnostic Tool Kit to the K73 Telematics Communication Interface Control Module. Place the test antenna on the roof of the vehicle, ignition ON.
- Verify DTC B2462 is not set.
- If DTC B2462 is set
Replace the K73 Telematics Communication Interface Control Module.
- Go to next step: If DTC B2462 is not set
- If DTC B2462 is set
- Ignition OFF, disconnect the EL-49903 GM OnStar antenna diagnostic tool kit from the K73 Telematics Communication Interface Control Module
- Disconnect the K73 Telematics Communication Interface Control Module GPS coax cable at the T4E Cellular Phone and Navigation Antenna.
- Test the coax cable between the K73 Telematics Communication Interface Control Module and the T4E Cellular Phone and Navigation Antenna. Refer to component testing.
- If the coax cable does not pass the test
Replace the coax cable.
- Go to next step: If the coax cable passes the test
- If the coax cable does not pass the test
- Test or replace the T4E Cellular Phone and 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.