Airbag control unit with part number A1718204726

What does the airbag control unit A1718204726 do?

The airbag control unit A1718204726 is the central control unit of the restraint system (SRS) for Mercedes-Benz. It evaluates the signals from the crash sensors, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

Faults are reported via the airbag warning light in the instrument cluster. The housing also carries the manufacturer number Bosch 0285001984.

Why does the control unit A1718204726 fail?

With the control unit A1718204726, the most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot delete it. Other causes are ageing of the electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data also arises when no airbag was triggered, and it remains in the memory even if the vehicle then drives without any irregularities. The other causes develop over a longer period or result from voltage spikes, for example from a weak battery or a jump start.

How can you tell that the A1718204726 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently in the event of a defect in the control unit A1718204726. In addition, there is an error message in the instrument cluster and a fault memory that cannot be cleared.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Error message in the instrument cluster
• The diagnostic tool gets no connection to the control unit
• The fault memory cannot be cleared

In the event of a defect, airbags and seatbelt pretensioners may not deploy in an emergency. The warning light shows that the system has detected a fault; only reading out the fault memory shows which cause lies behind it.

Which vehicles is the A1718204726 fitted in?

This list lets you check whether the control unit A1718204726 belongs to your vehicle. The control unit A1718204726 is fitted in these vehicles: Mercedes-Benz SLK-Class R171 Convertible (2004-2011).

The vehicles in which this number is recorded are listed here:

• Mercedes-Benz SLK-Class R171 Convertible (2004-2011)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 1718206526, 1718207326, 285010422, 500405210770, 500408130020, 500603070328.

How does the repair of the A1718204726 work?

You have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit A1718204726. Then create the repair order online and send in the well-packed unit.

Airbag24 checks the control unit on the test bench, replaces defective components and carries out a functional test. Your own unit is then returned to you.

Processing at Airbag24 usually takes 3–4 working days. 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 A1718204726 get to Airbag24?

You send the control unit A1718204726 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof. Make sure that it does not shift in the carton and that the packaging is completely closed.