Airbag control unit with part number 89170-B1190

What is the function of the airbag control unit 89170-B1190?

The airbag control unit with part number 89170-B1190 is the central control module for the occupant restraint system (SRS) in specific Daihatsu models. It processes data from crash sensors, controls the deployment of airbags and seatbelt pretensioners within milliseconds, and permanently stores accident-related data.

As the brain of the passive safety system, this component is responsible for activating life-saving restraint systems in the event of a collision. It continuously monitors all connected components of the SRS network—including various airbag modules, seat occupancy sensors, and seatbelt pretensioners—for full functionality.

Flawless operation is critical to safety. Any internal defect or communication failure results in immediate deactivation of the entire system, clearly indicated to the driver by the constantly illuminated airbag warning light on the instrument panel.

Why does the control unit 89170-B1190 fail?

Defects in the 89170-B1190 control unit typically arise from stored crash data after an accident, which locks the device. Other causes include internal hardware failures in electronic components such as capacitors or circuit board damage, leading to complete failure or communication issues.

The most common reason for repair is resetting the stored crash data. After one or more airbags—such as the driver’s, knee, or seat airbags—are deployed, the control unit records this information and disables further operation until the data is professionally erased.

In addition, age-related failures of electronic components on the circuit board may occur. Similar to related Toyota/Daihatsu part numbers, such as 89170-0D100, moisture ingress or improper prior repair attempts can result in complex damage requiring professional restoration.

How do you recognize a fault in the 89170-B1190?

A fault in the 89170-B1190 control unit primarily manifests as a persistently illuminated airbag warning light. Other typical symptoms include loss of communication with diagnostic equipment or specific malfunctions when the component heats up, such as a non-functioning clock.

The classic sign is the airbag warning light that fails to extinguish after engine start-up or remains constantly lit during driving. This indicates a serious SRS system error requiring immediate inspection at a workshop.

Another clear indication is when a workshop cannot establish communication with the airbag control unit using diagnostic tools. The control unit no longer responds to OBD interface requests, suggesting an internal electronic fault or total failure.

A specific symptom unique to this type of unit is complete failure under heat. For example, if the clock or other connected systems stop functioning during summer high temperatures, it strongly points to a thermal issue on the control unit’s circuit board.

In which vehicles is the 89170-B1190 installed?

The airbag control unit with part number 89170-B1190 is mainly found in Daihatsu vehicles. Experts at Airbag24 have successfully repaired this component in models such as the Daihatsu Charade G11 and the Daihatsu Sirion M300 series from model year 2004 onward.

At Airbag24, the 89170-B1190 control unit is repaired for the following models:

Daihatsu: Charade (G11), Sirion (M300, from 2004)

Due to platform overlaps between Daihatsu and Toyota, it is always recommended to verify the exact part number or vehicle identification number (VIN) to ensure compatibility.

How is the 89170-B1190 professionally repaired?

Professional repair at Airbag24 includes a comprehensive bench test diagnosis, proper erasure of stored crash data, and replacement of defective electronic components. Final functional tests confirm full operability, backed by 2 years' statutory liability for defects.

Upon receipt of the removed control unit at Airbag24, an initial incoming inspection is performed. Using a bench test, the fault memory is read out and the unit’s communication is checked to precisely pinpoint the root cause of the malfunction.

The core of the repair involves addressing the identified defect. This may include erasing crash data using specialized programming tools or replacing faulty hardware components such as capacitors or microprocessors, employing professional soldering and measurement techniques.

After repair, the control unit undergoes a thorough final inspection to ensure all faults have been resolved and it functions perfectly again. The unit is returned in “plug-and-play” condition and is ready for immediate installation.