What is a Lexus RC 350 airbag control unit?
The Lexus RC 350 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It continuously monitors sensors, stores relevant crash data, and ensures the proper functioning of all airbag modules and seatbelt pretensioners in the vehicle. A professional Lexus RC RC350 airbag control unit repair is essential for safety.
This module, also known as the "Computer Assy, Air Bag," is responsible for the immediate and precise deployment of the airbags.
It processes real-time data from various impact sensors to decide in a fraction of a second whether deployment is necessary.
In addition, it plays a key role in system diagnostics and signals possible malfunctions through the SRS warning light in the cockpit.
Why is the Lexus RC 350 airbag control unit defective?
A Lexus RC 350 airbag control unit often malfunctions after an accident because it stores crash data and then experiences functional limitations or blockages. Internal electronic component failure, surges, or age-related wear can also lead to a failure that requires immediate Lexus RC RC350 airbag control unit repair.
After a collision, the control unit stores indelible "crash data" that prevents further use without a reset.
Internal electronic defects, short circuits, or software errors can also cause the module to break and the airbag warning light to illuminate.
In rare cases, moisture ingress or extreme vibrations can also damage components and cause failure.
Common error codes for Lexus RC RC350 airbag control unit repair
When diagnosing a faulty Lexus RC 350 airbag control unit, specific trouble codes will appear that indicate internal problems or communication disruptions, allowing for a targeted Lexus RC RC350 airbag control unit repair. These DTCs are crucial for accurately identifying the failure and correcting the problem.
- B1000 → Control unit communication error → Internal failure of the airbag ECU or problem with the CAN bus connection.
- B1861 → Open circuit knee airbag driver side → Defect in the knee airbag circuit, often in the control unit or the wiring.
- B1907 → Right front seat airbag short to ground → Electrical problem in the right front seat airbag circuit, indicates a fault in the module.
- B1907/74 → Short circuit to ground front belt pretensioner LH → Circuit problem with the left front belt pretensioner that can be traced back to the control unit.
- B1908 → Short circuit to battery (12V) right front seat airbag → Overload or short circuit in the airbag circuit, indicates module damage.
- B1908/74 → Short circuit to positive front belt tensioner LH → Electrical fault in the belt tensioner circuit, which is detected by the control unit.
- B1920 → Short circuit rear left airbag → Short circuit in the circuit of the left rear airbag, connected to the control unit.
- B1921 → Left Rear Airbag Open Circuit → Open circuit in the left rear airbag circuit, a typical fault for diagnosis.
- B1922 → Short to ground rear right airbag → Electrical problem in the right rear airbag circuit.
- B1923 → Short circuit to battery rear right airbag → Overload in the circuit of the right rear airbag, monitored by the control unit.
- B1925 → Short circuit rear right airbag → General short circuit in the right rear airbag circuit.
- B1926 → Right rear airbag open circuit → Open circuit in the right rear airbag circuit.
- B1927 → Short circuit to ground rear right airbag → Fault in the ground contact of the rear right airbag circuit.
- B1928 → Short circuit to rear right airbag battery → Overvoltage in the rear right airbag circuit.
What part numbers are available for the Lexus RC RC350 airbag control unit repair?
For a successful Lexus RC RC350 airbag control unit repair or replacement, precise OEM part numbers are critical to ensure compatibility. The following genuine Lexus part numbers are verified for the Lexus RC 350 airbag control unit and cover various model years and trim levels, making parts sourcing easier.
The primary and most commonly required OEM part number is 89170-24170 , often referred to as 8917024170 without the hyphen.
Alternative, also original part numbers for the Lexus RC 350 airbag control unit are 89170-24320 (or 8917024320 ) and 89170-24440 (or 8917024440 ).
These numbers ensure that it is the correct "Computer Assy, Air Bag" and not sensors or other components of the SRS system, which is important for any Lexus RC RC350 airbag control unit repair.
Lexus RC RC350 Airbag Control Unit Repair or Replacement Process
Repairing or replacing a Lexus RC 350 airbag control unit requires careful diagnosis, often erasing crash data, and, if necessary, reprogramming at a specialized workshop. A professional Lexus RC RC350 airbag control unit repair restores the airbag system to full functionality after a failure or malfunction has been identified.
First, a detailed diagnosis is carried out using special OBD-II scanners to read the exact error codes that indicate the defective module.
If the control unit is blocked only due to crash data, a reset service can often be offered that restores the module to its factory state and saves costs.
In case of irreparable internal damage, a complete replacement of the airbag control unit is required, followed by programming to the specific vehicle identification number (VIN) of the Lexus RC 350 to ensure safety.
Once the repair or replacement is complete, the system will be retested to ensure no further faults remain and the airbag warning light will turn off.