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 MANUALSBUICK2013REGAL TURBO PREMIUM, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 152 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2470CIRCUIT/SYSTEM TESTING (WITH NAVIGATION RADIO)
2013 Buick Regal Turbo Premium, Standard Trans
Circuit/System Testing (with Navigation Radio)
2013 Buick Regal Turbo Premium, Standard TransSECTION Circuit/System Testing (with Navigation Radio)
WARNING: This page is about a different car, the 2012 Buick Regal. 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.
- The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.
- Ignition OFF and all vehicle systems OFF, disconnect the GPS and cellular coax cable connector at the K73 telematics communication interface control module. It may take up to 2 minutes for all vehicle systems to power down.
- Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the K73 telematics communication interface control module. Place the test antenna on the roof of the vehicle.
- Verify the DTC does not set while operating the vehicle within the conditions for running the DTC.
- If the DTC sets
Replace the K73 telematics communication interface control module.
- If the DTC does not set
- If the DTC sets
- Ignition OFF, connect the coax cable to the K73 telematics communication interface control module and disconnect the coax cable from the T15 navigation signal splitter.
- Ignition ON.
- Test for 4.5-5.5 V between the coax cable center conductor and the outer shield.
- If greater than 5.5 V
Test or replace the coax cable.
- If less than 4.5 V
Test or replace the coax cable.
- If between 4.5-5.5 V
- If greater than 5.5 V
- Ignition OFF.
- Test the coax cable between the T15 navigation signal splitter and the T4G cellular phone, navigation, and digital radio antenna. Refer to Component Testing.
- If the coax cable does not pass the test
Replace the coax cable.
- If the coax cable passes the test
- If the coax cable does not pass the test
- Test or replace the T15 navigation and signal splitter.
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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.