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.
Circuit/System Description
When the headlight switch is placed in low beam position, the body control module (BCM) applies a voltage to the low beam headlamps (TT4) or daytime running lamps (DRL) lamps (TT2) through there respective voltage supply circuits.
The headlamp control module will monitor the DRL (TT2) circuits when the BCM applies the voltage to turn on the lamps. If the headlamp control module detects that the BCM commanded on the DRL (TT2), but the headlamp control module does not detect the DRL has illuminated, DTC B2575 or B2699 will set in the headlamp control module. This indicates there is a malfunction in the TT2 headlamp assembly, or an open bulb.
NO RELATED
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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.