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 1000 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1025-B1095CIRCUIT/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 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
The DTC can be set by either the radio or the amplifier. If the DTC was set by the radio, diagnose suspect audio input circuits to the speakers or the amplifier (if equipped). Diagnose audio input signals to the speakers from the amplifier if the DTC was set by the amplifier.
DTC Set In Amplifier
- With the scan tool, verify the DTC is set by the amplifier.
- Ignition OFF, disconnect the suspect speaker. Test for 1-50 ohms across the speaker terminals.
- If not within the specified range specified range replace the suspect speaker.
- Disconnect the suspect audio amplifier harness connector.
- Test for less than 1 volt on both of the suspect speaker output circuits.
- If greater than 1 volt repair short to voltage.
- Test for infinite resistance between both of the suspect speaker output circuits and ground.
- If resistance is less than specified value, repair short to ground.
- Test for less than 1 ohm between suspect speaker output circuits amplifier harness connector and the suspect speaker harness connector.
- If greater than specified value repair open or high resistance.
- If all circuits test normal, replace the amplifier.
DTC Set In Radio With Amplifier
- With the scan tool, verify the DTC is set by the radio.
- Disconnect the suspect audio amplifier harness connector.
- Disconnect the radio harness connector.
- Test for less than 1 volt on both of the suspect low level audio signal circuits.
- If greater than 1 volt repair short to voltage.
- Test for infinite resistance between both low level audio signal circuits and ground.
- If less than specified value, repair short to ground.
- Test for less than 1 ohm between the suspect low level audio signal circuits amplifier harness connector and the suspect speaker harness connector.
- If greater than specified value repair open or high resistance.
- If all circuits test normal, replace the amplifier.
DTC Set In Radio Without Amplifier
- With the scan tool, verify the DTC is set by the radio.
- Ignition OFF, disconnect the suspect speaker. Test for 1-50 ohms across the suspect speaker terminals.
- If not within the specified range specified range replace the suspect speaker.
- Disconnect the suspect radio harness connector.
- Test for less than 1 volt on both of the low level audio signal circuits.
- If greater than 1 volt repair short to voltage.
- Test for infinite resistance between both of the suspect low level audio signal circuits and ground.
- If resistance is less than specified value, repair short to ground.
- Test for less than 1 ohm between the suspect speaker harness connector both low level audio signal circuits and the suspect radio harness connector.
- If greater than specified value repair open or 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.