Airbag control unit with part number 5WK43461

What is the function of Airbag Control Unit 5WK43461?

The Airbag Control Unit 5WK43461, manufactured by Siemens/Continental, serves as the central control module for the Supplemental Restraint System (SRS) in certain Honda models. It processes data from crash sensors to precisely deploy airbags and seatbelt pretensioners in the event of a collision. It is often listed under Honda’s OEM part number 77960-SAA-E812-M1.

As an SRS ECU (Supplemental Restraint System – Electronic Control Unit), this module continuously monitors all safety‑related components of the airbag system, including front and side airbags, seatbelt pretensioners, and their associated sensors. Its primary task is to assess the severity of an impact and, within milliseconds, determine which restraint systems need to be activated to provide optimal occupant protection.

Communication with other vehicle systems and diagnostic capabilities via the OBD port are also key functions. The unit stores system‑relevant fault codes and, following a crash, the corresponding deployment data (crash data).

Why does Airbag Control Unit 5WK43461 fail?

The most common causes of failure for control unit 5WK43461 are internal electronic faults on the circuit board and the storage of crash data after an accident. Hardware issues such as defective voltage regulators, cold solder joints, or corrupted memory chips (EEPROM/Flash) often result in complete communication loss or persistent error messages.

A primary defect frequently lies in the internal power supply electronics. Faulty voltage regulators or cold solder joints caused by corrosion and aging can disrupt power delivery to the control logic or microcontroller, leading to total device failure.

Another widespread issue involves memory or data problems. Defective EEPROM or Flash memory chips, or corruption of stored data, can block functionality. This often manifests as the control unit becoming unresponsive to diagnostic tools.

After a crash, the control unit sets a so‑called “crash flag.” This lockout mechanism is a safety precaution that prevents reuse without proper inspection and repair. Simply clearing the fault memory is not sufficient in such cases.

Rarer causes include corroded pins on the connector or problems with the ground connection, which may lead to sporadic errors or communication issues.

How do you recognize a defect in Control Unit 5WK43461?

A faulty 5WK43461 control unit typically shows up as a permanently illuminated airbag warning light on the instrument cluster. Another clear indication is that the control unit cannot be accessed by diagnostic equipment (no communication). Even after a crash, repair is often unavoidable because crash data remains stored.

The most obvious symptom is the persistently lit airbag indicator light. It does not turn off after starting the engine, signaling a serious, permanent fault in the SRS system.

A critical failure occurs when workshops’ diagnostic tools cannot establish communication with the airbag control unit. The unit fails to respond to diagnostic protocols (e.g., KWP/ISO9141), making further fault analysis impossible.

If fault codes related to the internal control unit, power supply, or incorrect detection of front or side airbags appear, this also points to a defect within the control unit itself.

In which vehicles is Control Unit 5WK43461 installed?

The airbag control unit with part number 5WK43461 is primarily used in various generations of the Honda Jazz. At Airbag24, we repair this module for the Honda Jazz AA series, the Honda Jazz GD series (model years approximately 2001–2008), and the Honda Jazz GE series (model years approximately 2008–2015). It is often found under Honda’s equivalent part number 77960-SAA-E812-M1.

At Airbag24, we have successfully refurbished this control unit for the following models and series:

- Honda Jazz AA

- Honda Jazz GD (circa 2001–2008)

- Honda Jazz GE (circa 2008–2015)

Since multiple hardware and software versions may exist, a precise verification using the part number before repair is essential.

How is Control Unit 5WK43461 professionally repaired?

Professional repair at Airbag24 includes a detailed component‑level diagnosis, electronic refurbishment, and safe reset of crash data. Upon receipt, the unit undergoes thorough testing; defective components such as voltage regulators or memory chips are replaced, and cold solder joints are reworked. Finally, a functional test is performed. We offer 2 years' statutory liability for defects on every repair.

Upon receipt of the control unit at Airbag24, a complete data backup of the EEPROM and flash memory is first performed. Simultaneously, all fault codes are read out, and the circuit board is visually inspected under a microscope for corrosion, signs of burning, or broken solder joints.

This is followed by electrical testing and component-level repair at an ESD‑protected workstation. Defective components such as voltage regulators, capacitors, or MOSFETs are professionally replaced using hot‑air rework stations and soldering irons. Cold or cracked solder joints are carefully resoldered.

If crash data has been stored, specialized processing of the memory data is carried out. This is a safety‑critical procedure that must be performed only by qualified technicians in compliance with legal requirements to restore full functionality.

After repair, the control unit is tested on a test bench for communication capability and proper operation. Following successful final inspection, the unit is prepared for return shipment. You receive 2 years' statutory liability for defects on all work performed.