What is a Lexus GX J120 airbag control unit?
The Lexus GX J120 airbag control unit is the central safety unit in the vehicle, responsible for monitoring, controlling, and deploying all airbag systems in the event of an accident. It collects data from sensors and stores important crash information, thus ensuring occupant protection in an emergency.
This essential module, also known as the SRS control unit, continuously communicates with front, side, and curtain airbags, seat belt pretensioners, and seat occupancy detection systems. It is typically located in the center console or under the driver's seat to ensure short wiring routes and enable rapid diagnostics.
Why is the Lexus GX J120 airbag control unit defective?
A Lexus GX J120 airbag control unit is often reported as defective after an accident because it permanently stores crash data, thus preventing reuse. Internal electronic errors or a communication failure can also cause the system to malfunction, requiring professional Lexus GX J120 airbag control unit repair.
After the airbags are deployed, even in a minor impact, the control unit stores indelible crash data. This flag prevents the system from functioning properly and must be removed through a service reset to restore the airbag control unit to operational status.
Sometimes aging, moisture, or voltage fluctuations can damage internal components, leading to failure. A targeted diagnosis helps identify the exact cause of the defect and initiate the necessary repair.
Common error codes for Lexus GX J120 airbag control unit repair
A faulty Lexus GX J120 airbag control unit will display specific error codes that indicate communication issues or internal malfunctions within the module. These codes are crucial for a precise diagnosis and initiating the necessary repair of the Lexus GX J120 airbag control unit.
- B1000: Control unit communication error → Signals problems in the data transmission of the airbag control unit → Cause: Internal circuit problems or connection errors to the vehicle electronics.
- B1861: Open in knee airbag squib circuit (driver side) → Indicates an open circuit in the driver side knee airbag deployment circuit → Cause: Open circuit in the wiring harness or in the squib itself, detected by the control unit.
- B1153: Airbag Control Module Fault → A generic trouble code that often indicates problems with the seat belt or system integrity → Cause: Faulty seat belt pretensioner connection, internal module problems, or sensor malfunctions affecting the control module.
Accurate interpretation of these error codes is essential for a successful diagnosis. They guide the workshop to the specific problem solution and the necessary repair of the airbag control unit.
What part numbers are available for the Lexus GX J120 airbag control unit repair?
For the repair of a Lexus GX J120 airbag control unit, the original OEM part numbers 89170-60620 and 89170-60F30 are primarily relevant, as these modules are designed specifically for the J120 series. Alternative parts or supplier numbers are not confirmed for this safety-relevant component.
The search for exact OEM part numbers for the airbag control unit specifically for Lexus GX J120 (model years 2002-2009) resulted in the following validated information:
- 89170-60620: Lexus Genuine – This airbag control unit fits Lexus GX460, but is also listed for J120 models due to part number overlaps in OEM databases.
- 89170-60F30: Lexus Genuine – Another official OEM part number listed for GX460, which is also mentioned in connection with J120 models in OEM databases.
Both part numbers typically begin with "89170," which indicates Toyota/Lexus airbag control units. Only these original part numbers should be considered when repairing or replacing a defective module.
No confirmed alternative manufacturer numbers from Bosch, Continental, Siemens, or Autoliv could be found. This is common for safety-related Lexus/Toyota airbag control units, which usually have their own OEM number and require precise diagnosis and Lexus GX J120 airbag control unit repair.