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.
2007 Saturn Relay 3.9 1FACTORY OEM SERVICE PROCEDURE
Lighting DTCS
LIGHTING DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | DEFINITION |
|---|---|
| DTC B2545 | Backup Lamps Circuit |
| DTC B2580 | Headlamp High Beam Control Circuit |
| DTC B2610 | Passenger Compartment Dimming 1 Circuit |
| DTC B2645 | Ambient Light Sensor Circuit |
| DTC B3445 | Stop Lamp Circuit |
| DTC B3838 | Park Lamp Relay Control Circuit |
| DTC B3948 | Left Front Turn Signal Circuit |
| DTC B3949 | Right Front Turn Signal Circuit |
| DTC B3950 | Left Rear Turn Signal Circuit |
| DTC B3951 | Right Rear Turn Signal Circuit |
| DTC C0277 | Brake Pedal Position Sensor Circuit |
| DTC C0278 | Brake Pedal Position Sensor Not Calibrated |
| DTC C0283 | Brake Pedal Position Sensor Circuit Low |
| DTC C0870 | Brake Pedal Position Sensor Reference Output Circuit |
| DTC P0572 | Cruise Control Brake Pedal Position Sensor Circuit Low Voltage |
| DTC P0573 | Cruise Brake Pedal Position Sensor Circuit High Voltage |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.