What is a Toyota Tundra K40 airbag control unit?
The Toyota Tundra K40 airbag control unit is the central safety unit in the vehicle, activating all occupant restraint systems in the event of an accident. It continuously monitors a multitude of sensors, stores relevant crash data, and thus ensures the proper functioning of all airbag modules and seatbelt pretensioners for maximum safety.
This module, also known as the SRS ECU, is crucial for the passive safety of the Toyota Tundra. It processes data from impact sensors and reliably deploys the airbags when necessary.
Its precise functionality ensures that airbags and belt tensioners are triggered at the right moment and with the correct intensity to provide optimal protection for occupants.
Why is the Toyota Tundra K40 airbag control unit defective?
The Toyota Tundra K40 airbag control unit can be defective because crash data is permanently stored after an accident, requiring deactivation. Internal electronic errors, moisture damage, or power surges can also cause failure, illuminating the airbag warning light and requiring professional diagnosis and repair.
Often, the airbag control unit is "broken" after an airbag deployment and stores non-erasable crash data. This data must be reset using special software to restore the system's functionality.
Other causes of failure can be age-related wear and tear on components, short circuits in the vehicle system, or corrosion caused by water ingress, which makes repair or replacement necessary.
Common error codes for Toyota Tundra K40 airbag control unit repair
When repairing the Toyota Tundra K40 airbag control unit, specific error codes indicate problems with the control unit itself, not with sensors or seatbelt pretensioners. Diagnosing these codes, such as B1000, B1800, or B1801, is crucial for pinpointing the module failure and initiating a targeted repair at the workshop.
- B1000 → Control unit communication error → Signal interruption or internal defect in the communication between the SRS ECU and the vehicle network.
- B1800 → SRS ECU Error (Internal Error Function) → General malfunction within the electronic components of the airbag control unit, which affects its operational readiness.
- B1801 → SRS ECU Error (Microprocessor) → Defect or malfunction of the main processor in the airbag control unit, which may lead to a complete failure of the control system.
What part numbers are available for the Toyota Tundra K40 airbag control unit repair?
For Toyota Tundra K40 airbag control unit repairs, specific Toyota OEM part numbers are 100% verified and recommended. These genuine parts ensure full compatibility and functionality of the airbag system, enabling a safe and effective repair or replacement of the defective module.
The proven OEM part numbers for the Toyota Tundra K40 airbag control module include: 89170-0C060, 89170-0C160, 89170-0C190, 89170-0C440 and 89170-0C670.
These numbers are typical for Toyota airbag control units in Tundra models from approximately 2004 to 2014 and can be purchased as original parts or reconditioned using special services to ensure a cost-effective repair.