What is an Infiniti FX35 S51 airbag control unit?
The Infiniti FX35 S51 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It monitors sensors, stores crash data, and ensures the proper functioning of all airbag modules in the vehicle, essential for safety.
This electronic control unit, also called the SRS computer, is responsible for the precise activation of the front and side airbags as well as the seat belt pretensioners.
It continuously processes signals from crash and acceleration sensors to activate the necessary protective measures within milliseconds in the event of an impact.
Why is the Infiniti FX35 S51 airbag control unit defective?
An Infiniti FX35 S51 airbag control unit is often defective because it permanently stores crash data after an accident, which must be erased, or internal components can fail due to age. Failure can also be caused by electrical short circuits or water damage, which impairs functionality.
After a collision, the control unit stores special crash data that requires reprogramming or a reset of the module, otherwise it will continue to report an error.
Internal component fatigue or corrosion of the electronic components can lead to failure over the years, making an Infiniti FX35 S51 airbag control unit repair necessary.
Communication errors with other vehicle systems via the CAN bus are also a common cause of malfunctions and the illumination of the airbag warning light.
Common error codes for Infiniti FX35 S51 airbag control unit repair
When repairing the Infiniti FX35 S51 airbag control unit, specific error codes are crucial for diagnosing the exact cause of a malfunction. These codes directly indicate problems within the control unit or its communication, guiding specialists to the correct fix.
- B1015 → Airbag control unit malfunction → Indicates an internal malfunction of the control unit.
- B1139 → Unspecified airbag control unit error → Indicates a general malfunction in the airbag control unit without specific detailed information.
- B1427-55 → Airbag computer module replaced, must be configured → This code appears when a new or used control unit has been installed but has not yet been programmed specifically for the vehicle.
- B14XX → Airbag Computer Module Defective → Indicates a general defect in the airbag module, which often requires a reset or replacement.
- U1000 → CAN bus communication error (airbag ECU) → Indicates an interruption or malfunction in the data communication between the airbag control unit and other systems in the vehicle.
- U1010 → Airbag control unit (CAN) communication error → Confirms a specific communication error of the airbag control unit via the CAN bus.
What part numbers are available for the Infiniti FX35 S51 airbag control unit repair?
For Infiniti FX35 S51 airbag control unit repairs, precise OEM part numbers are crucial, as the module is coded specifically for each vehicle. Only an exact part number match ensures correct function and compatibility of the replacement part.
The most important verified OEM part numbers for the airbag control unit of the Infiniti FX35 S51 (approx. model years 2007-2012) are:
- 988208Y70A
- K851M-1CA3A
- K851M-1CA0A
- K8510-1WW0B
These numbers have been confirmed by multiple checks in official Infiniti spare parts catalogs and at specialized dealers.
It is crucial to accurately match the part number shown on your original module, as an incorrect number may result in incompatibility and safety risks.
To date, no alternative supplier part numbers (e.g. from Bosch or Continental) are publicly listed for these OEM modules.