Airbag control unit with part number A1698202185

What does the airbag control unit A1698202185 do?

The airbag control unit A1698202185 coordinates the safety systems with airbags and seatbelt pretensioners in the vehicle of Mercedes-Benz. It receives the messages from the crash sensors, decides within milliseconds on triggering in an accident, and checks the system continuously. After an accident it stores crash data and locks itself.

It reports faults via the airbag warning light in the instrument cluster and records them in the fault memory.

Why does the control unit A1698202185 fail?

The most common cause is crash data stored after an accident, even without an airbag having triggered. It cannot be cleared with an ordinary diagnostic tool; Airbag24 takes care of that during the repair. Added to this are ageing components, cold solder joints, moisture and corrosion on plugs, and voltage spikes.

The fault memory reveals which fault is present, but does not always show where it comes from.

Voltage spikes, for example from a weak battery or a jump start, stress the electronics.

How can you tell that the A1698202185 is defective?

Signs include the airbag warning light in the instrument cluster, which lights constantly or intermittently. An error message in the instrument cluster, a missing connection to the diagnostic tool or a fault memory that cannot be cleared also point to a defect. In an emergency, airbags and seatbelt pretensioners may possibly fail to deploy.

• Airbag warning light that lights constantly or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory remains after reading out

If you notice any of these signs, a check is advisable.

Which vehicles is the A1698202185 fitted in?

The A1698202185 can be found in the following vehicles: Mercedes-Benz B-Class W245 (2005-2011); Mercedes-Benz A-Class W169 (2004-2012).

The vehicles for which this control unit is recorded are shown in the overview below.

• Mercedes-Benz B-Class W245 (2005-2011)
• Mercedes-Benz A-Class W169 (2004-2012)

Matching the number on the label of the removed unit only confirms that it is the right unit. The fault memory beforehand remains important: only it shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers A1698201326, A1698202726, A1698204085, A1698206626, A1698206726, A1698207726.

How does the repair of the A1698202185 work?

The log of the fault memory comes first: have it read out. Then disconnect the battery before the control unit is removed. For testing, repair and functional check at Airbag24, 3–4 working days are usually planned.

Afterwards you create the repair order online and send the packed unit. Airbag24 checks it on the test bench, replaces defective components, deletes stored crash data and tests the function. The unit then goes back to you.

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 A1698202185 get to Airbag24?

A parcel or a booked UPS collection brings the unit to Airbag24; you book the collection for an extra charge. The return is likewise by UPS.

Enclose the printed repair order with the parcel and pack the unit so that it withstands knocks.