Airbag control unit with part number 5WY67021-95160

What is the function of the Airbag Control Unit 5WY67021-95160?

The Airbag Control Unit 5WY67021-95160 is the central control module of the Occupant Restraint System (SRS) in the Daewoo Tosca V250. It processes signals from the internal acceleration sensors, calculates the optimal deployment timing, and activates the relevant airbags and seatbelt pretensioners in the event of a crash. All system states and fault codes are stored internally.

As a combined module, it integrates both crash-sensing technology and the triggering electronics. Its primary task is to continuously monitor the entire SRS circuit, including all igniters, wiring, connectors, and sensors.

In the event of a collision, the control unit determines within milliseconds which restraint systems need to be deployed to provide maximum occupant protection. This decision is based on data from the integrated acceleration sensors.

All relevant data—especially crash events and diagnostic trouble codes (DTCs)—is permanently stored in its internal memory, typically an EEPROM chip designated 95160. This data retention is crucial for fault diagnosis and repair.

Why does the Control Unit 5WY67021-95160 fail?

The most common cause of failure is the storage of crash data after an airbag deployment, which locks the unit. Other reasons include internal hardware defects such as faulty voltage regulators or driver stages, as well as data corruption in the internal 95160 memory chip.

Following a crash, the control unit permanently records a “crash event” in the EEPROM. While this lock ensures safety, it prevents reuse of the otherwise intact device. The airbag warning light remains illuminated until the data is professionally reset.

Internal electronic faults are another frequent cause. Aging, thermal stress, or overvoltage can lead to failures in power supply components, protective diodes, or MOSFET drivers for the ignition circuits. Corrosion caused by moisture can also damage circuit traces.

Problems with the memory or microcontroller—particularly corrupted data in the 95160 EEPROM—can result in total failure. In rarer cases, severe mechanical damage to the housing or internal sensors following a major crash renders repair impossible.

A similar repair principle applies to related part numbers such as 5WY67023-95160, used in other GM, Daewoo, or Chevrolet vehicles and built on analogous technical foundations.

How do you recognize a defect in the Airbag Control Unit 5WY67021-95160?

A defect in the 5WY67021-95160 control unit is unmistakably indicated by a permanently lit or flashing SRS airbag warning light on the instrument cluster. Often, a warning message appears on the display, and the entire airbag system is deactivated for safety reasons.

The primary and most obvious symptom is the persistent activation of the airbag warning light, which fails to extinguish after starting the vehicle. This alerts the driver to a critical fault in the restraint system.

When diagnosed via the OBD interface, specific fault codes are retrieved. Errors such as “control unit locked,” “crash data stored,” or “internal control unit error” directly point to a defect within the module itself, rather than peripheral components like sensors or igniters.

The most serious consequence is that the control unit disables the entire airbag system. In the event of another accident, the airbags and seatbelt pretensioners would fail to deploy, posing a significant safety risk.

In which vehicles is the Control Unit 5WY67021-95160 installed?

The Airbag Control Unit with part number 5WY67021-95160 was specifically developed for certain Daewoo models. It is primarily found in the Daewoo Tosca sedan of the V250 series. At Airbag24, we repair this module for the vehicles listed below.

At Airbag24, we offer professional repair services for the 5WY67021-95160 control unit, installed in the following models:

Daewoo: Tosca V250 (2006–2010), Tosca V250 Facelift (2010–2014)

How is the Control Unit 5WY67021-95160 professionally repaired?

Professional repair at Airbag24 follows a multi-step process. After an initial inspection on the test bench, the internal 95160 memory is read out, and any stored crash data is safely erased. Defective hardware components are replaced if necessary. A final test ensures full functionality.

Upon submission to Airbag24, each control unit undergoes a detailed electronic preliminary analysis on a specialized test bench. Here, communication is verified, and the internal fault memory is read to pinpoint the exact cause.

The core of the repair often involves working on the 95160 EEPROM. Using specialized hardware, crash events and fault flags are erased from memory. If additional components such as voltage regulators, driver ICs, or protection diodes are defective, they are professionally replaced.

Finally, the control unit undergoes a comprehensive functional test to ensure it operates flawlessly and is fully ready for use again. Of course, all repairs come with 2 years' statutory liability for defects.