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 899 (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 does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. 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.