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 K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1428 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESNAVIGATION SYSTEM - VOICE RECOGNITION MALFUNCTIONCIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the OnStar® voice recognition is operating normally.
- If the OnStar® voice recognition is inoperative, refer to OnStar Microphone Malfunction .
- Ignition OFF, disconnect the radio harness connector X1 and CIM harness connector X3.
- Test for less than 1 volt on the voice recognition audio signal circuit radio harness connector terminal 4 and ground.
- If greater than specified value, test the circuit for a short to voltage.
- Test for greater than 1 ohm between the voice recognition audio signal circuit radio harness connector terminal 4 and ground.
- If less than specified value, test the circuit for a short to ground.
- Test for less than 1 ohm between the voice recognition audio signal circuit radio harness connector terminal 4 and the voice recognition audio signal circuit CIM harness connector terminal 2.
- If greater than specified value, test the circuit for an open/high resistance.
- Test for less than 1 volt on the voice recognition audio low reference circuit radio harness connector terminal 5 and ground.
- If greater than specified value, test the circuit for a short to voltage..
- Test for greater than 1 ohm between the voice recognition audio low reference circuit radio harness connector terminal 5 and ground.
- If less than specified value, test the circuit for a short to ground.
- Test for less than 1 ohm between the voice recognition audio low reference circuit radio harness connector terminal 5 and the voice recognition audio low reference signal circuit CIM harness connector terminal 4.
- If greater than specified value, test the circuit for an open/high resistance.
- If all circuits test normal, replace the radio.
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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.