B1220
NiskiDoor Sensor Circuit — Signal Out of Range, Open or Short Circuit. The code concerns the microswitch informing the BCM module about the open/closed status of the door, trunk or hood.
OBD-II (EN): Door Sensor Circuit Range/Performance/Open Circuit/Short Circuit
Code B1220 indicates a fault in the door sensor circuit — the BCM module does not receive the correct signal about the open or closed status of the door, trunk or hood. The cause may be a damaged microswitch, an open circuit in the wiring harness, or a corroded electrical connector. Diagnosis by a mechanic with access to an OBD-II scanner that can read live data and precisely locate the damage is recommended.
Symptoms
- Incorrect interior lighting operation (light does not turn off or does not turn on when door is opened) - Incorrect dashboard indications (door open icon illuminated despite closed doors) - Incorrect alarm or central locking operation - Possible battery discharge (constant cabin lighting power supply) - Disabled or limited automatic window closing function
Possible causes
- Damaged door sensor microswitch (mechanical wear or contact corrosion) - Open or short circuit in the wiring harness leading to the door sensor - Corrosion or oxidation of the sensor electrical connector - Damaged BCM (Body Control Module) — rarely - Mechanical damage to the hinge or latch preventing proper switch activation
Affected systems
Does code B1220 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.