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 MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1228 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2455CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban C2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF. Disconnect the harness connector at the cellular microphone.
- Ignition ON, test for 9-11 volts at signal circuit terminal B.
- If greater than specified value, repair short to B+ or replace the navigation radio.
- If less than specified value, repair short to ground or open/high resistance or replace the navigation radio.
- Disconnect the navigation radio X4 harness connector.
- Test for less than 1 volt at the cellular microphone terminal A.
- If greater than specified value, repair short to B+.
- Test for greater than 1 ohm between terminal A and ground
- If less than specified value, repair short to ground.
- Test for less than 1 ohm between terminal A and terminal 16.
- If greater than the specified value, repair open/high resistance.
- If all circuits test normal, test or replace the cellular microphone.
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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.