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.
2003 GMC Jimmy 4D Utility, AWDFACTORY OEM SERVICE PROCEDURE
Lighting DTCS
LIGHTING DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B1397 | 5 Volt Reference Output Circuit Voltage Low |
| DTC B1398 | 5 Volt Reference Output Circuit Voltage High |
| DTC B1480 | Inadvertent Power Relay Control Circuit |
| DTC B2527 | Front Fog Lamp Switch Signal Circuit Is Shorted To Ground |
| DTC B2537 | Rear Fog Lamp Switch Signal Circuit Is Shorted To Ground |
| DTC B2577 | Headlamp Relay Coil Supply Voltage Circuit Shorted To Ground |
| DTC B2585 | Short To Ground In Interior Park Lamps Fused Supply Voltage Circuit Or An Open In Park Lamp Relay Control Circuit |
| DTC B2600 | Dimmer Switch High Beam Signal Circuit |
| DTC B2613 | Voltage 2 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 Shorted To Battery Voltage |
| DTC B2647 | Ambient Light Sensor Input Voltage Voltage Low, Or Courtesy Lamp Relay Coil Control Circuit Open Or Shorted To Ground |
| DTC B2648 | Ambient Light Sensor Input Voltage High, Or Courtesy Lamp Relay Coil Control Circuit Shorted To Battery |
Factory Service Tools
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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.