Airbag control unit with part number A1698201585

What does the airbag control unit A1698201585 do?

The airbag control unit A1698201585 coordinates the restraint system (SRS) in vehicles from Mercedes-Benz. It reads the signals from the crash sensors, decides in an accident within milliseconds whether to trigger the airbags and seatbelt pretensioners, and monitors the system permanently.

The unit reports faults via the airbag warning light in the instrument cluster. This way the driver learns that something is wrong with the system.

After an accident the control unit stores crash data and locks itself. Beyond this fact, nothing further belongs in the description of the function.

Why does the control unit A1698201585 fail?

The most common cause is crash data that lies in the unit after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it.

Other causes include the following:

• Ageing electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump-starting

Each of these causes acts on the electronics and can lead to failure on its own or in combination with the others.

How can you tell that the A1698201585 is defective?

A defect shows up as the airbag warning light lighting up permanently or intermittently. A fault message appears in the display, and the diagnostic tool finds no connection to the control unit.

A further sign is a fault memory that cannot be emptied despite a clearing attempt. Then there is a fault that you should take seriously.

Airbags and seatbelt pretensioners may not be able to deploy in an emergency if the control unit is defective. It is therefore worth acting quickly on every indication.

Which vehicles is the A1698201585 fitted in?

The A1698201585 is fitted in these vehicles: Mercedes-Benz B-Class W245 (2005-2011); Mercedes-Benz A-Class W169 (2004-2012).

The vehicles from the stored data are listed here:

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

Compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Have the fault memory read out beforehand. Only this result shows whether the control unit is the cause or a plug or cable.

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 A1698201585 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit. Then create a repair order online and send in the unit.

This order is for safety reasons. The control unit is only removed after the battery has been disconnected, and the log later helps to assign the fault.

Airbag24 checks the unit on the test bench, replaces defective components and erases stored crash data. A function test follows, then your own unit goes back. Processing usually takes 3–4 working days.

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 A1698201585 get to Airbag24?

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

Place the printed repair order in the parcel. Pack the unit shockproof.