Airbag control unit with part number A1669011200

What does the airbag control unit A1669011200 do?

The airbag control unit A1669011200 manages the restraint system (SRS) of Mercedes-Benz. In an accident it evaluates the crash sensors and decides which airbags and seatbelt pretensioners trigger. In addition, it stores crash data after an accident and locks itself.

During operation the control unit checks the interplay of sensors, wiring and airbags. If it detects a deviation, it switches on the airbag warning light.

This function must work reliably, because triggering allows no repetition.

Why does the control unit A1669011200 fail?

The most common cause of the A1669011200 is crash data stored from an accident, even if no airbag has triggered. Further causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes such as from a weak battery or jump-starting.

A normal diagnostic tool cannot delete the crash data. At Airbag24 it is deleted as part of the repair.

Plug connections are a source of faults that shows itself only under certain loads, which is why they are part of the cause search.

How can you tell that the A1669011200 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently in the event of a fault on the A1669011200. In addition, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

The light is a clear sign that the restraint system is not working in its normal state.

In an emergency, airbags and seatbelt pretensioners may not trigger. Therefore have the system checked.

Which vehicles is the A1669011200 fitted in?

The control unit A1669011200 is installed in these vehicles: Mercedes-Benz ML-Class W166 SUV (2011-2015).

The following shows the list of vehicles known for this number.

• Mercedes-Benz ML-Class W166 SUV (2011-2015)

You compare the number on the label of the removed unit with this page. This establishes only whether it is the matching unit, nothing more.

Also have the fault memory read out before you change anything on the vehicle. Only the log 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 A 166 900 39 03, A1669001211, A1669001709, A1669002003, A1669002103, A1669002713.

How does the repair of the A1669011200 work?

For the A1669011200, Airbag24 requires 3–4 working days as a rule. First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Next create a repair order online and send the unit in.

The unit goes onto the test bench at Airbag24. Defective components are repaired, stored crash data is deleted, and a function test follows.

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 A1669011200 get to Airbag24?

The unit goes to Airbag24 as a parcel, or UPS collects it from you for an extra charge. The return after the repair is made by UPS.

Enclose the printed repair order in the parcel and pack the unit shockproof.