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.
Scan Tool Data Definitions: Outputs
Courtesy Lamp Relay: The scan tool displays the commanded state of the courtesy lamp relay. The scan tool displays ON when the BCM allows the courtesy lamp relay coil to go to ground to activate the courtesy lamps.
DRL: The scan tool displays the commanded state of the DRL relay. The scan tool displays On when the BCM allows the DRL relay coil to go to ground to activate the daytime running lamps.
Dimming: The scan tool displays the state of the panel dimmer switch. The scan tool displays Active when the park lamps are ON.
Front Fog Lamp Relay: The scan tool displays the commanded state of the front fog lamp relay. The scan tool displays On when the BCM allows the front fog lamp relay to go to ground to activate the front fog lamps.
Headlamp Power Relay: The scan tool displays the commanded state of the headlamp power relay. The scan tool displays On when the BCM allows the headlamp power relay to go to ground to activate the headlamps.
Inadvertent Power Relay: The scan tool displays the commanded state of the inadvertent power relay. The scan tool displays On when the BCM allows the inadvertent power relay to go to ground. The BCM allows the component of the courtesy circuit to remain on until the BCM times it off.
Interior Lighting Mode: The scan tool displays the name of the feature which commanded the interior lights on. The scan tool displays None when the interior lights are not commanded on. The scan tool displays Interior, Ilium. Entry, Exit Lighting and Remote Ilium, when the respective mode commands the interior lights on.
Park Lamp Relay: The scan tool displays the commanded state of the park lamp relay. The scan tool displays On when the BCM allows the park lamp relay to go to ground to activate the park lamps.
Rear Fog Lamp Relay: The scan tool displays the commanded state of the rear fog lamp relay. The scan tool displays On when the BCM allows the rear fog lamp relay to go to ground to activate the rear fog lamps (Export Only).
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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.