What is a Lexus IS IS500 airbag control unit?
The Lexus IS IS500 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—a critical safety concern that is the focus of every successful Lexus IS IS500 airbag control unit repair.
This module, often referred to as the SRS computer, is the heart of your Lexus IS500's passive safety system. It continuously evaluates signals from acceleration and collision sensors.
In the event of an impact, the control unit ensures the precise, multi-stage deployment of the front, side, knee and curtain airbags.
Why is the Lexus IS IS500 airbag control unit defective?
A Lexus IS IS500 airbag control unit can fail because it is frequently exposed to internal errors, power surges, or data corruption caused by accidents. Moisture, aging components, or a crash are common causes of failure, necessitating a professional Lexus IS IS500 airbag control unit repair.
Common causes of failure include internal EEPROM errors or power supply problems. These can severely impair the functionality of the controller.
After an accident, the control unit stores crash data, which can cause the module to lock up and require a reset or repair.
Communication errors with other vehicle systems or damaged connectors can also cause the airbag control unit to break.
Common error codes for Lexus IS IS500 airbag control unit repair
When diagnosing a faulty Lexus IS IS500 airbag control unit, specific error codes often arise that indicate internal problems or communication failures. Reading these codes is the first step in any successful Lexus IS IS500 airbag control unit repair to identify the exact cause of the failure.
- B1000 → Control unit communication error → Problems with data transmission between airbag ECU and other systems.
- B1181 → Airbag ECU internal error → Defect in the internal hardware or software of the control unit.
- B1206 → Battery connection problems at the control unit → Open or weak point in the power supply to the module.
- B1310 → Airbag ECU self-test error → The control unit detected a malfunction during the system check.
- B1820 → Communication error in the system → Disturbed communication within the airbag system or with connected control units.
- B1836 → Curtain airbag open circuit (ECU monitoring circuit) → Break or contact problem in the curtain airbag circuit monitored by the control unit.
- B1860 / B1861 → Open circuit in the airbag control unit (squib/driver circuit) → Open circuit in the ignition circuits of the airbags that are directly controlled by the control unit.
- B1926 → Airbag control unit general error → An unspecified fault in the airbag control unit itself.
What part numbers are available for the Lexus IS IS500 airbag control unit repair?
For the Lexus IS IS500 airbag control unit repair, the only 100% verified genuine OEM part number is 89170-53790. This number is critical for correct matching and ensuring compatibility, as no alternative or replacement part numbers have been confirmed by trusted sources.
Part number 89170-53790 is the specific airbag control unit for the Lexus IS500. It has been confirmed as a genuine part several times.
If your Lexus IS IS500 has a faulty control unit, using this precise OEM number is essential to ensure correct repair or replacement.
Other part numbers in circulation usually refer to individual airbag modules or sensors and are not relevant to the central control unit.
When looking for a replacement or professional diagnosis and repair, rely only on part number 89170-53790 to resolve the failure.