What is a Toyota Roomy M900A airbag control unit?
The Toyota Roomy M900A airbag control unit is your vehicle's central safety unit, precisely activating all occupant restraint systems, such as airbags and seatbelt pretensioners, in the event of an accident. It continuously monitors sensors, stores relevant crash data, and ensures the proper functioning of all airbag modules. Repairing the Toyota Roomy M900A airbag control unit will restore full safety.
This sophisticated module is crucial for passive safety. It communicates with other vehicle systems via the CAN bus to ensure a quick and reliable response in an emergency.
It processes data from acceleration and crash sensors to detect accidents early. It also controls the deployment of driver, front passenger, and optional side and head airbags.
Why is the Toyota Roomy M900A airbag control unit defective?
A Toyota Roomy M900A airbag control unit often malfunctions because it stores crash data after an accident and then activates an airbag warning light. Internal electronic damage, power surges, or age-related wear and tear can also cause failure, requiring repair of the Toyota Roomy M900A airbag control unit to restore full functionality.
Because the control unit continuously stores crash data during an impact, it is often blocked after an accident. This causes the airbag light on the dashboard to remain permanently illuminated.
Moisture ingress or age-related material fatigue of electronic components are other common causes of defects. Early diagnosis prevents further problems with passive safety.
Common error codes for Toyota Roomy M900A airbag control unit repair
Common error codes for the Toyota Roomy M900A airbag control unit indicate internal communication errors, problems with the ignition circuits, or general control unit malfunctions. These specific B-codes are crucial for an accurate diagnosis to confirm the need for repair of the Toyota Roomy M900A airbag control unit and restore safety functionality.
- B1000 → Control unit communication error → Cause: Internal control unit error or CAN bus communication problem.
- B1811 → Driver Squib Dual Stage 2nd Stage Circuit Failure → Cause: Defect in the driver squib control unit circuit, often an active ECU fault.
- B1801 → Diagnosis error code airbag control unit error → Cause: Internal control unit error or problem with the programming of the airbag ECU.
- B1771 → Historical fault in seat occupancy / passenger circuit → Cause: A historical code stored in the control unit, often not active or critical to the ECU function.
What part numbers are available for the Toyota Roomy M900A airbag control unit repair?
When repairing a Toyota Roomy M900A airbag control unit, specific OEM part numbers are crucial to ensure proper compatibility and functionality. These verified numbers guarantee that the replacement or repaired control unit meets your vehicle's exact safety standards and ensures reliable operation after the Toyota Roomy M900A airbag control unit has been repaired.
The main Toyota OEM part numbers for the SRS airbag control unit on the M900A are 89170-52B40, 89170-52B41, and 89170-52B42. These are consistently listed in official catalogs such as the Toyota Genuine Parts Catalog and TecDoc.
Additionally, the Autoliv OEM number 95910-0P010 is verified as a compatible airbag control unit for the Toyota Roomy M900A. Autoliv is a leading supplier of airbag systems.
All numbers mentioned refer explicitly to the SRS control unit and not to sensors or other modules. For a 100% fit, we always recommend checking your Toyota dealer's VIN.