What is a Toyota C-HR NGX50 airbag control unit?
The Toyota C-HR NGX50 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It precisely monitors sensors, stores relevant crash data, and ensures the immediate and proper operation of all airbag modules and seatbelt pretensioners in the vehicle to maximize occupant safety.
This essential module, also known as the SRS control unit, forms the heart of the passive safety system. It coordinates the deployment of front, side, and curtain airbags when needed.
In addition, the control unit integrates with other vehicle systems such as the pre-collision system to provide comprehensive protection.
Why is the Toyota C-HR NGX50 airbag control unit defective?
A Toyota C-HR NGX50 airbag control unit often fails because it stores irretrievable crash data after an accident, preventing continued operation, or because internal components fail due to overvoltage or aging. This requires specialized repair.
After an impact, the control unit stores so-called "hard codes" that remain even after error codes have been cleared and prevent the airbags from being deployed again.
Internal memory errors, communication problems with other vehicle modules, or even water damage can also lead to failure, making professional diagnosis and repair essential.
Common error codes for Toyota C-HR NGX50 airbag control unit repair
During Toyota C-HR NGX50 airbag control unit repairs, specific B-codes often occur, which indicate problems directly within the control unit rather than with sensors or external components. These error codes require professional analysis and a targeted reset of the module to restore full functionality of the safety system.
- B1000 : Control unit communication error → Signal interruption or internal circuit defect → Airbag ECU
- B1101 : Internal Airbag Control Unit Error → Software or hardware defect in the module → Airbag ECU
- B1615 : Airbag control unit internal error → Damage or malfunction of the internal logic → Airbag ECU
- B1622 : Memory error in the airbag control unit → Corrupt crash data or faulty EEPROM → Airbag ECU
- B1788 : Voltage problem in the airbag control unit → Undervoltage or overvoltage, unstable power supply → Airbag ECU
- B1826 : Control unit reset required → Stored crash information prevents operation → Airbag ECU
These error codes are critical and indicate that the control unit itself is the cause of the problem and requires professional repair.
Professional diagnostics using special Toyota equipment are crucial to accurately identify and correct these errors.
What part numbers are available for the Toyota C-HR NGX50 airbag control unit repair?
For Toyota C-HR NGX50 airbag control unit repair, the primary and verified original manufacturer part number 89170F4210 from Toyota is crucial, as it uniquely identifies the SRS airbag control module of the C-HR. Alternative OEM numbers from suppliers such as Bosch or Continental are not publicly known for this control unit.
The number 89170F4210 identifies the correct airbag control unit for Toyota C-HR models from approximately 2018/2020 and is listed at many spare parts retailers.
It is important to note that this part number applies only to the airbag control unit and not to sensors or other airbag components, which have their own numbers.
When looking for replacement parts or a professional airbag control unit repair, this original part number should always be used as a reference.