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 1841 (DTC INDEX)LIGHTING DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Lighting DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Lighting DTCS
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 GMC C3500 HD, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
LIGHTING DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B1397 | 5 Volt Reference Output Circuit Voltage Low |
| DTC B1398 | 5V Reference Circuit Voltage High |
| DTC B1480 | Courtesy Lamps Supply Voltage Circuit Voltage Low |
| DTC B2527 | Front Fog Lamp Switch Signal Circuit Is Shorted To Ground |
| DTC B2577 | Headlamp Relay Coil Supply Voltage Circuit Shorted To Ground |
| DTC B2585 | Interior Park Lamps Supply Voltage Circuit |
| DTC B2613 | Instrument Panel Lamp Supply Voltage Circuit Is Shorted To Battery Voltage |
| DTC B2617 | Courtesy Lamp Relay Coil Control Circuit Is Open Or Shorted To Ground |
| DTC B2618 | Courtesy Lamp Relay Coil Control Circuit Is Open Or Shorted To Ground |
| DTC B2642 | Ground Illumination Relay Control Circuit Is Open Or Shorted To Ground |
| DTC B2643 | Ground Illumination Relay Control Circuit Is Shorted To Battery Voltage |
| DTC B2647 | Ambient Light Sensor Input Voltage Low |
| DTC B2648 | Ambient Light Sensor Input Voltage High |
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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.