Airbag control unit with part number A1179008700

What does the airbag control unit A1179008700 do?

The airbag control unit A1179008700 is the central control unit of the restraint system (SRS) for Mercedes-Benz. It evaluates the signals from the crash sensors, decides in the event of an accident whether airbags and seatbelt pretensioners are triggered, and continuously monitors the system. After an accident it stores crash data and locks itself.

The unit reports faults via the airbag warning light in the instrument cluster. The housing also carries the manufacturer number Bosch 0285011949.

The control unit is therefore the point where faults in the restraint system first become visible.

Why does the control unit A1179008700 fail?

Stored crash data are the most common cause on the A1179008700, even if no airbag has deployed. Aged components, moisture at connectors and voltage spikes are also possible causes.

This data cannot be erased with a standard diagnostic tool. Airbag24 erases it as part of the repair.

Electronic components can also age and solder joints can go cold. Corrosion at connectors disrupts contact, and voltage spikes, for example from a weak battery or a jump start, put strain on the electronics.

How can you tell that the A1179008700 is defective?

A defect on the A1179008700 shows itself through the airbag warning light, which stays on permanently or intermittently. A fault message in the instrument cluster and a fault memory that cannot be cleared likewise indicate a problem.

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool gets no connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. A warning light coming on is therefore a reason to have the condition checked.

Which vehicles is the A1179008700 fitted in?

The A1179008700 is fitted in these vehicles: Mercedes-Benz CLA-Class X117 Shooting Brake (2015-2019) and C117 Saloon (2013-2019); Mercedes-Benz GLA-Class X156 SUV (2013-2020).

The vehicles for this part number at a glance:

• Mercedes-Benz CLA-Class X117 Shooting Brake (2015-2019)
• Mercedes-Benz CLA-Class C117 Saloon (2013-2019)
• Mercedes-Benz GLA-Class X156 SUV (2013-2020)

Before removal, these checks make sense. Comparing the part number on the label of the removed unit with this page only ensures that you have the right unit. The fault memory read out beforehand, by contrast, shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0 285 011 863, 285013862, A117 900 18 01, A117 900 58 00, A1179001701, A1179001702.

How does the repair of the A1179008700 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit A1179008700. Next create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a functional test. 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 A1179008700 get to Airbag24?

You send in the control unit A1179008700 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit shockproof before it sets off.