Airbag control unit with part number 04896371AA

What is the function of the airbag control unit 04896371AA?

The airbag control unit with part number 04896371AA is the central SRS module (Supplemental Restraint System) for the first-generation Chrysler 300M (LR). As an OEM component from Bosch, it processes data from the crash sensors and is responsible for deploying the airbags and seatbelt pretensioners in the event of a collision.

Technically, this device serves as the brain of the entire occupant protection system. It continuously monitors all connected sensors and components. As soon as the sensors detect a collision exceeding predefined thresholds, the control unit sends the critical ignition signals to the respective airbags and seatbelt pretensioners.

In the vehicle, the module—officially designated as “MODULE, Occupant Restraint”—is installed beneath the center console directly on the transmission tunnel. Removing it therefore requires dismantling the console, which should be performed by a qualified workshop.

Why does the control unit 04896371AA fail?

The most common causes of failure for the control unit 04896371AA are stored crash data following an accident that blocks further functionality, as well as internal electronic malfunctions. External factors such as moisture or wiring issues can also lead to failure.

One major cause is the storage of crash data. After an airbag deployment, the manufacturer locks the control unit for safety reasons. This lock remains permanently stored in memory, preventing reuse until the data is professionally erased and the unit reset.

Internal faults represent another frequent source of problems. Diagnostic tools often display error codes indicating a defect within the control unit itself—for example, communication issues with side-mounted sensors or general internal hardware failures. Such defects arise from the failure of electronic components on the circuit board.

Additionally, external factors can impair functionality. These include water damage caused by ingress of moisture, broken or improperly connected wires, and loose electrical connections. A workshop diagnosis is essential to rule out these external sources of failure before removing the control unit.

How do you recognize a fault in the control unit 04896371AA?

The clearest symptom of a defective airbag control unit 04896371AA is the permanently illuminated airbag warning light on the instrument cluster. Furthermore, diagnostic equipment may no longer establish communication with the SRS module, or specific internal error codes may be read.

The airbag warning light is the primary alert signal for the driver. If it remains lit after starting the vehicle, it indicates a malfunction in the restraint system. In this state, the airbags and seatbelt pretensioners are no longer functional.

A qualified workshop can use diagnostic equipment to read the fault memory. Typical entries pointing to the control unit include “Internal Control Unit Error” or “Communication Not Possible.” These messages generally confirm a defect requiring repair or replacement.

In which vehicles is the control unit 04896371AA installed?

The control unit with part number 04896371AA is specifically used in the first generation of the Chrysler 300M (internal designation LR). This includes both the original models and the facelifted version of the series.

At Airbag24, we repair part number 04896371AA for the following models:

Chrysler 300M 1st Gen (LR, 1998–2004)

Chrysler 300M LR (model years 1998–2001)

Chrysler 300M LR Facelift (model years 2001–2004)

It’s important to note that newer generations of the Chrysler 300 use different part numbers for their airbag control units. Part number 04896371AA applies exclusively to the aforementioned LR series.

Is repairing the control unit 04896371AA worthwhile?

Yes, repair is a highly cost-effective alternative to purchasing a new unit. According to the manufacturer, a new control unit costs approximately €800–€1,000, whereas repair can save up to 70%.

The biggest advantage lies in substantial cost savings. Instead of an expensive new purchase, the existing defective unit is refurbished, significantly easing the budget.

An additional key benefit is that the vehicle-specific configuration of the control unit is preserved. Following repair, the module can typically be reinstalled without complex re-coding or reprogramming (plug-and-play), saving time and extra workshop expenses.

A professional repair restores full functionality—and thus the safety—of the occupant protection system. Furthermore, 2 years’ statutory liability for defects is provided on the completed service.

How is control unit 04896371AA professionally repaired?

The repair process begins with a vehicle diagnosis, followed by removal and shipping of the control unit. At Airbag24, the module is thoroughly analyzed, crash data is erased, defective components are replaced, and final functional tests are performed before it is returned ready for installation.

First, a specialized workshop should read out the fault memory to confirm that the defect indeed lies within the control unit. After proper removal, the device is securely packaged for transport and ideally sent to the repair service along with a fault report.

Upon receipt at Airbag24, the control unit undergoes a comprehensive inspection. Technicians pinpoint the exact fault, whether it’s an internal hardware issue or stored crash data.

The actual repair involves erasing crash data and replacing any faulty electronic components on the circuit board. The unit is then calibrated and tested on a test bench to verify the correct operation of all systems. All repairs come with 2 years' statutory liability for defects.