U0140Średni
Utrata komunikacji z BCM (moduł nadwozia)
Komunikacja sieciowa
Sprawdź szczegóły →B1100
WysokiFault in the door multiplex control unit or airbag sensor assembly. Manufacturer code indicating incorrect operation of the body system.
OBD-II (EN): Door Multiplexer or Airbag Sensor Unit Malfunction
Code B1100 indicates a fault in the door multiplex control unit or, depending on the vehicle manufacturer (e.g., Toyota, VW, Saab), incorrect operation of the airbag sensor. The cause could be a damaged electronic module, connector corrosion, or a wiring harness fault. Due to the possible connection to the SRS system, prompt diagnosis at a workshop is recommended.
Symptoms
- Central locking or power windows not working or working partially - Warning on the dashboard (airbag or body fault light) - No communication between door control modules - In Toyota vehicles: SRS airbag system disabled - Intermittent problems with door electronics (mirrors, interior lighting)
Possible causes
- Damage to the door multiplex control unit (module failure) - Fault in wiring or connectors (corrosion, chafing, broken wire) - Failure of the airbag sensor assembly (especially Toyota, VW, Saab) - Interference on the CAN/LIN bus communicating with door modules - Short circuit or open circuit in the control module power supply
Affected systems
Moduł sterowania drzwiami (BCM/DDM)System poduszek powietrznych SRSMagistrala CAN/LIN karoseriiCentralny zamekPodnośniki szyb elektrycznychSystem oświetlenia wewnętrznego
Related codes
B0100Niski
Obwód zewnętrznego oświetlenia — usterka
Nadwozie
Sprawdź szczegóły →U0155Średni
Utrata komunikacji z modułem wspomagania (EPS)
Komunikacja sieciowa
Sprawdź szczegóły →Code B1100 appears in these brands
Go to messages and symptoms for your brand — there we analyze this code together with other typical alerts.
Does code B1100 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.