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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 870 (BODY CONTROL SYSTEM)DIAGNOSTIC INFORMATION & PROCEDURESDTC B1507 OR B1508: LOAD CONTROL CIRCUIT DOES NOT REACT AS COMMANDEDCONDITIONS FOR RUNNING THE DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Conditions for Running the DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Conditions for Running the DTC
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- This DTC shall run only if the Voltage to the BCM is between 9.0 and 16.0 volts.
- The ignition must be in the ON position.
- This DTC shall not set during BCM programing and configuration changes.
- This DTC shall not set if any communication codes are set.
RENDER: 1.0x
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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.