Airbag control unit with part number A2038204485

What does the airbag control unit A2038204485 do?

The airbag control unit A2038204485 is the central control unit of the restraint system (SRS) for Mercedes-Benz. It evaluates the signals from the crash sensors and decides within a fraction of a second in the event of an accident which airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light.

The manufacturer number Bosch 0285001547 is also stamped on the housing.

The control unit monitors the system continuously. After an accident, it stores crash data and locks itself.

Why does the control unit A2038204485 fail?

Most often the cause is crash data stored after an accident, even if no airbag has been triggered; other causes can be aged components, cold solder joints, moisture, corrosion and voltage spikes. With this control unit, the crash data often cannot be deleted. If you would like the crash data deleted, get in touch with Airbag24 briefly before sending the unit in.

The other possible causes are the following:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the A2038204485 is defective?

The airbag warning light in the instrument cluster shows the defect by lighting up continuously or intermittently. This is accompanied by fault messages in the instrument cluster, a diagnostic tool without a connection to the control unit, and a fault memory that cannot be deleted.

• airbag warning light lights up continuously or intermittently
• fault message in the instrument cluster
• diagnostic tool cannot connect to the control unit
• fault memory cannot be deleted

In an emergency, the airbags and seatbelt pretensioners may then not trigger. An intermittent fault is just as important as one that is shown constantly. Take the warning seriously and have the system checked.

Which vehicles is the A2038204485 fitted in?

The control unit A2038204485 is fitted in these vehicles: Mercedes-Benz C-Class CL203 Coupé (2000-2008), W203 Saloon (2000-2007), S203 Estate (2001-2007) and CLC203 Coupé (2008-2011). Whether your own unit fits is shown by comparing the part number on the label.

The following vehicles are listed in detail:

• Mercedes-Benz C-Class CL203 Coupé (2000-2008)
• Mercedes-Benz C-Class W203 Saloon (2000-2007)
• Mercedes-Benz C-Class S203 Estate (2001-2007)
• Mercedes-Benz C-Class CLC203 Coupé (2008-2011)

Compare the part number on the label of the removed unit with this page, as this shows whether it is the correct unit. Have the fault memory read out before you remove anything. Only that shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0285001373, 0285001373 Bosch , 18209726, 2038206485, 285001548, 285001813.

How does the repair of the A2038204485 work?

First, the fault memory is read out and the log is enclosed. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and pack the unit well. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components and carries out a function test. Your own unit is then returned to you. If you would like the crash data deleted, get in touch with Airbag24 briefly before sending the unit in.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit A2038204485 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shockproof, so that it survives transport undamaged.