Airbag control unit with part number A1179009300

What does the airbag control unit A1179009300 do?

The airbag control unit A1179009300 is the central control unit of the restraint system (SRS) for Mercedes-Benz. It evaluates the crash sensors and, in an accident, decides within milliseconds on the triggering of airbags and seatbelt pretensioners.

In operation it checks whether all components work. Detected faults appear via the airbag warning light.

The manufacturer number Bosch 0285012057 is also stamped on the housing. After an accident the unit stores crash data and locks itself.

Why does the control unit A1179009300 fail?

The most common cause for the A1179009300 lies in stored crash data after an accident, even if no airbag was triggered. Other possible causes are aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

A normal diagnostic tool cannot erase this crash data; Airbag24 removes it during the repair.

Aged components and cold solder joints impair function, regardless of an accident.

Moisture and corrosion on plugs disturb the contact, while voltage spikes, for example from a weak battery or jump-starting, load the electronics.

How can you tell that the A1179009300 is defective?

A defect on the A1179009300 shows up as an airbag warning light that stays on permanently or intermittently, as a fault message in the instrument cluster, as a missing connection of the diagnostic tool to the control unit, and as a fault memory that cannot be cleared.

Airbags and seatbelt pretensioners may not trigger in an emergency. The warning light makes the condition visible and must therefore be taken seriously.

Then reading out the fault memory is the right next step.

Which vehicles is the A1179009300 fitted in?

The airbag control unit A1179009300 is installed in these vehicles: Mercedes-Benz CLA-Class C117 Saloon (2013-2019).

The models for which this part number is recorded are shown in the overview.

• Mercedes-Benz CLA-Class C117 Saloon (2013-2019)

Compare the part number on the label of the unit with this page, so that you have the right unit. Also have the fault memory read out beforehand: only that result shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 285011863, 285013862, A117 900 58 00, A1179001802, A1179009200, A1179011700.

How does the repair of the A1179009300 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit A1179009300. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is examined on the test bench, defective components are replaced, stored crash data is erased and a functional test is carried out. Afterwards your own unit is returned 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 A1179009300 get to Airbag24?

The control unit A1179009300 goes to Airbag24 as a parcel; alternatively, you book a UPS collection for an extra charge. Return shipping after the repair is done by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.