Suggested Hybspec services
Based on the systems affected by this code, we will most likely start with:
B1275
ŚredniMalfunction of the Main Light Switch 'OFF' Position Circuit. The lighting control system does not correctly detect the lights-off signal.
OBD-II (EN): Headlight Switch OFF Position Circuit Fault
Code B1275 signals a problem with the main light switch off position circuit – this most often manifests as headlights that are on and cannot be turned off. The cause is most often a worn combination light switch, less frequently damage to the wiring harness or MICU controller. We recommend a quick visit to an auto electrician, as permanently on lights can lead to battery discharge.
Symptoms
Main lights locked in the 'on' position and unresponsive to the switch; inability to turn off lights using the standard switch; increased battery drain/discharge when parked; possible incorrect operation of other combination switch functions (turn signals, wipers).
Possible causes
• Damaged or worn combination light switch (cause in over 80% of cases) • Damage to the wiring harness or connector corrosion in the light switch circuit • Faulty Multiplex Integrated Control Unit (MICU) • Short or open circuit in the switch 'OFF' position signal circuit • Mechanical damage to contacts inside the steering column switch
Affected systems
Oświetlenie zewnętrzneKombinowany przełącznik światełModuł MICU (Multiplex Integrated Control Unit)Instalacja elektryczna / wiązka przewodów
Does code B1275 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.