Airbag control unit with part number 68402856AD

What does the airbag control unit 68402856AD do?

The airbag control unit 68402856AD coordinates the SRS system of Jeep. In an impact it reads the crash sensors, calculates within milliseconds which airbags and seatbelt pretensioners fire, and checks the entire system in the background. It shows detected faults via the airbag warning light.

Sensors and actuators are connected to the unit via the vehicle network, and the unit constantly compares signals. The unit therefore checks for itself and continuously whether the system is ready for use.

After an accident, it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 68402856AD fail?

Stored crash data after an accident is the most common cause for 68402856AD, even if no airbag has fired. A normal diagnostic tool cannot access it, which is why the fault cannot simply be cleared. Other causes are aged components, cold solder joints, moisture and corrosion at connectors, and voltage spikes, for example from a weak battery or jump-starting.

The crash data remain in the unit's memory. Airbag24 erases them during the repair, and this is an important point for your decision.

The other causes concern components and connections: moisture and corrosion disturb the contact at plugs, aged electronics and solder joints can cause faults, and voltage spikes place additional strain on the unit.

How can you tell that the 68402856AD is defective?

The airbag warning light in the instrument cluster lights up on 68402856AD permanently or intermittently, together with an error message in the instrument cluster. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may therefore fail to deploy. It is advisable not to ignore the warning.

The light shows that the system has detected a fault, but it does not name a cause. Reading out the fault memory is needed for that.

Which vehicles is the 68402856AD fitted in?

A check against your own vehicle is worthwhile before you send anything in. The airbag control unit 68402856AD is fitted in these vehicles: Jeep Compass MP (2016-2020) and MP Facelift (from 2020).

The list names the vehicles in which this control unit has been installed:

• Jeep Compass MP (2016-2020)
• Jeep Compass MP Facelift (from 2020)

Compare the part number on the label of the removed unit with this page, so that you can be sure you have the right unit. Also have the fault memory read out in advance, because only the result 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 A2C13501200.

How does the repair of the 68402856AD work?

For control unit 68402856AD, first have the fault memory read out and attach the log. Then disconnect the battery and only then remove the unit. Afterwards create a repair order online and send in the well-packed unit.

At Airbag24 the unit is checked on the test bench, defective components are replaced, stored crash data is erased and a function test is run. Checking, repairing and testing take 3–4 working days as a rule, after which 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 68402856AD get to Airbag24?

You send your control unit 68402856AD to Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shock-proof.