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 15 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC B1478: RETAINED ACCESSORY POWER CIRCUIT HIGHCONDITIONS FOR SETTING THE DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Conditions For Setting The DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Conditions For Setting The DTC
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- The BCM detects a short to battery in the RAP relay control circuit when the BCM is trying to de-energize the RAP relay.
- The condition above must be present for more than 300 milliseconds.
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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.