Airbag control unit with part number 152300-4420

What is the function of the airbag control unit 152300-4420?

The airbag control unit with part number 152300-4420 is a Denso OEM component specifically designed for the Daihatsu Terios J100. It serves as the central control unit of the passive safety system, processing data from crash sensors and deploying airbags and seatbelt pretensioners in the event of an accident.

As the “brain” of the restraint system, this control unit continuously monitors all connected sensors and components. It processes signals from acceleration sensors to analyze the severity of a collision within milliseconds.

Based on this analysis, the unit makes the critical decision about whether and which airbags or seatbelt pretensioners should be activated to provide optimal protection for occupants. Its proper functioning is therefore essential for vehicle safety.

Why does the airbag control unit 152300-4420 fail?

The most common cause of failure for the 152300-4420 control unit is the storage of crash data after an accident, which permanently locks the device. Other causes include internal electronic faults leading to loss of communication or malfunctions. In some cases, issues with external sensors or wiring can also mimic a control unit malfunction.

After an airbag deployment, the control unit stores irreversible crash data. This lockout is intentionally implemented by the manufacturer to force a complete system check and prevent continued use of a potentially damaged component. As a result, the unit becomes disabled and must be professionally reset.

Electronic malfunctions are another frequent cause. Defective components on the circuit board—caused by aging, water damage, or thermal stress—can lead to total failure, internal error messages, or loss of communication with the diagnostic tester.

It’s also important to rule out external sources of trouble. Problems with wiring or crash sensors may produce symptoms that falsely suggest a faulty control unit. A thorough diagnosis at a workshop is therefore crucial before removal. The unit is also compatible with Denso part number 152300-7180.

How do you recognize a fault in the 152300-4420?

A defect in the 152300-4420 control unit primarily manifests as a constantly illuminated airbag warning light on the dashboard. Additionally, communication via the OBD2 interface often ceases, preventing diagnostic tools from reading the control unit. Following an airbag deployment, the unit is typically locked and requires resetting.

The most obvious sign is the persistently lit airbag warning light. It does not turn off after starting the vehicle, indicating a serious, safety‑related system error.

Another clear symptom is the loss of OBD communication. When attempting to read the fault memory, the workshop receives no response from the airbag control unit, pointing to a deep‑seated internal electronic fault.

Immediately after an accident in which the airbags have deployed, the control unit is systematically locked. The warning light remains on, and the unit must be repaired or its crash data erased to restore full functionality of the safety system.

In which models is the 152300-4420 control unit installed?

The Denso airbag control unit with part number 152300-4420 is specifically designed for the first‑generation Daihatsu Terios. At Airbag24, we specialize in repairing this control unit for that particular model, ensuring full functionality of the safety system.

At Airbag24, we repair the 152300-4420 part number for the following vehicle:

Daihatsu: Terios J100 (model years 1997–2006)

How is the 152300-4420 control unit professionally repaired?

At Airbag24, the 152300-4420 control unit undergoes a standardized repair process. Following an initial assessment, stored crash data is erased, and any defective electronic components on the circuit board are repaired. Final functional tests confirm that the module is fully operational again, ensuring system safety. Two years' statutory liability for defects is provided on all repairs.

Upon submission to Airbag24, a comprehensive diagnosis is performed. Technicians review internal error logs and crash data to pinpoint the exact cause of the issue—whether it’s an accident‑induced lockout or an electronic fault.

The core of the repair involves professionally erasing the stored crash data. If a hardware defect is identified, the faulty electronic components on the circuit board are located and expertly replaced.

Subsequently, the repaired control unit undergoes a comprehensive functional test. During this test, we verify that communication has been restored and that all internal processes are operating correctly. Each repair is completed with 2 years' statutory liability for defects.