What is a Toyota Crown S170 airbag control unit?
The Toyota Crown S170 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It precisely monitors sensors in the vehicle, stores important crash data, and ensures the proper functioning of all airbag modules. Repair is often necessary when the airbag warning light is illuminated.
The airbag control unit (also called SRS control unit or airbag ECU) is the brain of the passive safety system in the Toyota Crown S170, which was built between 1999 and 2003.
It continuously collects data from impact sensors and makes lightning-fast decisions about whether to deploy airbags and seatbelt pretensioners to protect the occupants.
After an impact, so-called crash data is stored in the control unit, which permanently activates the airbag warning light. This requires a specialized repair or reset.
Why is the Toyota Crown S170 airbag control unit defective?
Because it is required to store crash data after an accident, which permanently activates the airbag warning light, the Toyota Crown S170 airbag control unit is often reported as defective. Internal electronic errors or software failure can also lead to a loss of functionality, requiring professional repair.
A common reason for an apparent defect is the storage of crash data after an airbag deployment or a minor impact. This data must be professionally erased for the system to function again.
In addition to accidents, aging, corrosion, or voltage spikes can damage the control unit's internal electronic components. Such internal defects require professional diagnosis and repair of the control unit.
If the airbag warning light comes on without any apparent accident, it may indicate an internal fault or a communication error in the airbag control unit.
Common error codes for Toyota Crown S170 airbag control unit repair
During Toyota Crown S170 airbag control unit repair, specific error codes indicate problems within the system. These codes, often in B format, signal communication problems, internal defects in the control unit, or circuit faults that require precise diagnosis and professional repair of the airbag system.
- B1000 → Control unit communication error → Signals a communication problem between the airbag control unit and other systems.
- B1139 → Internal error in the SRS control unit → Indicates a direct defect within the airbag control unit.
- B1193 → Airbag Module Error → This code indicates a fault in the airbag control unit itself.
- B1206 → Restraint Control Module Error → A general error code that indicates problems with the restraint control module, i.e. the airbag control module.
- B1811 → Driver Squib Level 2 Circuit Fault → Describes a specific circuit fault in the area of the airbag squib ignition circuits, often control unit related.
What part numbers are available for the Toyota Crown S170 airbag control unit repair?
For Toyota Crown S170 airbag control unit repairs, exact OEM part numbers are crucial. These ensure that the replacement or repaired control unit is fully compatible and that the full functionality of the airbag system is restored. Only compatible original parts guarantee safety and correct function after repair.
The search for replacement or repair parts for the Toyota Crown S170 airbag control unit focuses on specific Toyota OEM numbers. Supplier numbers are rarely publicly listed for this model.
The exact OEM part numbers for the Toyota Crown S170 airbag control unit, validated through extensive research, are:
| Part number | Manufacturer | type |
|---|---|---|
| 89170-30J00 | Toyota | Original |
| 89170-30D70 | Toyota | Original |
| 89170-30410 | Toyota | Original |
No alternative OEM part numbers with equivalent functionality were found outside of these Toyota-specific numbers. This emphasizes the need to adhere to these exact numbers when repairing or replacing the Toyota Crown S170 airbag control module.