What is a Lexus SC SC400 airbag control unit?
The Lexus SC SC400 airbag control unit, also known as the SRS module, is your vehicle's central safety unit. It continuously monitors all airbag sensors and seatbelt pretensioners, stores important crash data, and is responsible for the precise and immediate deployment of the airbags in the event of a collision to provide optimal occupant protection.
This electronic control unit is crucial for the passive safety of the Lexus SC400. It acts as the brain of the entire airbag system and ensures its functionality.
Proper function is vital, which is why a quick Lexus SC SC400 airbag control unit repair is essential in the event of a defect. The module is specific to the SC400 model years 1992 to 1997.
Why is the Lexus SC SC400 airbag control unit defective?
A Lexus SC SC400 airbag control unit often fails because it stores crash data after an accident that requires a reset, or because it develops internal electronic errors. If the airbag warning light illuminates, this indicates a fault or failure that requires urgent Lexus SC SC400 airbag control unit repair to restore safety.
Common causes include internal circuit faults or voltage spikes, which can damage the sensitive electronics. Water ingress or mechanical damage can also cause the control unit to fail.
After an airbag deployment event, even in minor accidents, the control module stores irreversible crash data. This prevents reuse without a professional reset, which is part of a Lexus SC SC400 airbag control module repair.
Common error codes for Lexus SC SC400 airbag control unit repair
When diagnosing a faulty Lexus SC SC400 airbag control unit, specific error codes will occur that directly indicate problems with the module itself. These codes are crucial for precise Lexus SC SC400 airbag control unit repair, as they clearly identify the nature of the malfunction and enable targeted diagnosis in the workshop.
- B1000: Control unit communication error → The airbag control unit cannot communicate correctly with other systems, often due to internal electronic defects or damaged wiring.
- B1861: Driver Side Knee Airbag Open Circuit → The driver side knee airbag circuit is open, a problem monitored directly by the control module.
- B1820: Internal control unit error (self-diagnosis) → The airbag control unit detected an internal malfunction during its self-diagnosis, which indicates an electronic defect in the module.
- B1780: Airbag Deployment Circuit Malfunction → A problem was detected in the airbag deployment circuit, which is controlled by the control unit.
- B1100: Airbag ECU Internal Error → The airbag control unit reports a general internal error, which may indicate various internal malfunctions of the ECU.
What part numbers are available for the Lexus SC SC400 airbag control unit repair?
For a safe and compatible Lexus SC SC400 airbag control unit repair, only original OEM part numbers must be used. These parts are specifically designed for the Lexus SC400 (model years approximately 1992-1997) and ensure full functionality and compliance with safety standards.
The steering wheel airbag inflator control units are closely related and listed by the manufacturer as compatible OEM replacement parts:
- 45130-24160-E0 (Lexus) – Airbag Inflator / Control Unit (Steering Wheel)
- 45130-24190-E0 (Lexus) – Airbag Inflator / Control Unit (Steering Wheel)
- 45130-24191-E0 (Lexus) – Airbag Inflator / Control Unit (Steering Wheel)
The following original Lexus part numbers are verified for the passenger airbag (instrument panel):
- 73970-24011-C0 (Lexus) – Passenger airbag control unit/module
- 73970-24011-E0 (Lexus) – Passenger airbag control unit/module
There is also a specific part number for the lower instrument panel cover with integrated airbag module:
- 73900-53020-C0 (Lexus) – Instrument Panel Airbag (lower cover)
Ensure that these exact OEM part numbers match any repair or replacement. A repair shop can verify the exact fit using the vehicle identification number (VIN).