What is a Lexus IS XE40 airbag control unit?
The Lexus IS XE40 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.
This module, also known as the SRS Air Bag Control Module, receives signals from numerous crash and acceleration sensors. Based on this data, it precisely deploys the airbags and seatbelt pretensioners in a fraction of a second.
It is crucial for the vehicle's passive safety and communicates with other critical systems via the CAN bus. The control unit ensures continuous monitoring of the airbag circuits.
Why is the Lexus IS XE40 airbag control unit defective?
A Lexus IS XE40 airbag control unit typically fails due to damage from age, electrical surges, or an accident. Stored crash data after a collision or internal communication errors can cripple the system and necessitate a Lexus IS XE40 airbag control unit repair.
After an accident, the control unit stores indelible crash data, requiring reprogramming or replacement of the module. Even without a collision, internal electronic errors or moisture can lead to failure, impairing the function of the airbag system.
Errors in the internal software or damaged components within the control unit itself are other causes of malfunctions. An illuminated airbag warning light on the dashboard is often the first sign of a defect.
Common error codes for Lexus IS XE40 airbag control unit repair
During Lexus IS XE40 airbag control unit repairs, specific error codes are often read out, indicating internal problems or communication disruptions. These codes help specialized repairers diagnose the exact cause of a system failure and initiate the necessary repair steps.
- **B1000**: **Control unit communication error** → The airbag control unit does not communicate correctly with other systems or diagnostic tools.
- **B1100**: **Crash data stored in the control unit** → After an impact, crash data is stored in the control unit, which requires a reset using special software.
- **B1617/84**: **Loss of communication with left front airbag sensor** → The airbag control unit detects no or incorrect signals from the left front airbag sensor.
- **B1618/84**: **Initialization of the left front airbag sensor incomplete** → The left front airbag sensor could not be initialized properly by the control unit.
- **B1836**: **Open circuit in the passenger side curtain airbag** → The airbag control unit detects an open circuit in the circuit of the passenger side curtain airbag.
- **B1861**: **Open circuit in the driver's knee airbag circuit** → An open circuit in the driver's knee airbag circuit is reported by the control unit.
What part numbers are available for the Lexus IS XE40 airbag control unit repair?
For Lexus IS XE40 airbag control unit repairs, the exact OEM part number 89170-33A40 from Lexus is the primary reference. This number identifies the specific original replacement part, which fits the 4th generation Lexus IS models, such as the 2014 IS 350C.
Part number **89170-33A40** is a genuine Lexus OEM part number. It has been specifically validated for the airbag control module (SRS) of the Lexus IS XE40.
No alternative OEM part numbers from third-party manufacturers such as Bosch or Continental were found for this specific control unit. Therefore, 89170-33A40 is the most reliable number for a Lexus IS XE40 airbag control unit replacement or repair.