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 992 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2545CIRCUIT/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 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the underhood fuse block connector C 5, inside rearview mirror, and rearview camera module (if equipped) that are in the circuit.
- Ignition OFF, disconnect the BCM harness connector C2 and test for a ground signal at the connector terminal 22.
- If the circuit exhibits a ground signal, repair the short to ground in the control circuit.
- Reconnect the inside rearview mirror and test the BCM harness connector C2, terminal 22 again for ground.
- If the circuit now exhibits a ground signal of 20 ohms or less, replace the inside rearview mirror.
- Reconnect the underhood fuse block connector and test the BCM harness connector C2, terminal 22 again for ground.
- If the circuit now exhibits a ground signal of 20 ohms or less, replace the underhood fuse block.
- If equipped, reconnect the rearview camera module and test the BCM harness connector C2, terminal 22 again for ground.
- If the circuit now exhibits a ground signal of 20 ohms or less, replace the rearview camera module.
- If the circuit does not exhibit a ground, replace the BCM.
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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.