Airbag control unit with part number 68402856AA

What does the airbag control unit 68402856AA do?

The airbag control unit 68402856AA is the central control unit of the restraint system (SRS) for Jeep. It evaluates the signals from the crash sensors, decides within milliseconds in the event of an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The device reports faults in the restraint system via the airbag warning light in the instrument cluster. The monitoring runs in the background while you drive and covers all connected components of the system.

Because the evaluation takes place in the control unit, a defect affects the entire restraint system, even if the sensors are working perfectly. That is why this function is so important for safety in an emergency.

Why does the control unit 68402856AA fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at connectors, and voltage spikes.

The fact that no airbag has deployed does not mean that nothing is stored in the memory. A standard diagnostic tool cannot erase this crash data, and Airbag24 deletes it during the repair.

The remaining causes concern the device itself or the vehicle's electrical system. Aged components, cold solder joints and moisture at connectors can lead to faults over a longer period.

Voltage spikes occur, for example, with a weak battery or when a jump start is carried out. Such loads can damage components in the control unit.

How can you tell that the 68402856AA is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and in addition a fault message appears on the display. A diagnostic tool also fails to connect to the control unit, and the fault memory cannot be cleared.

The warning light indicates the defect, so you cannot overlook it. The exact wording of the fault message depends on the vehicle.

In an emergency, airbags and seatbelt pretensioners may fail to deploy if there is a defect. Therefore have the system checked promptly, even if the vehicle seems to drive normally in everyday use.

Which vehicles is the 68402856AA fitted in?

The control unit 68402856AA is fitted in these vehicles: Jeep Compass MP (2016-2020) and MP Facelift (from 2020).

The list below shows the Jeep vehicles to which this part number is assigned.

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

First compare the part number on the label of the removed unit with this page. This ensures that you have the correct unit. Have the fault memory read out beforehand, because only the result shows whether the control unit itself is defective or whether a connector 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 68402856AA work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Then create a repair order online and pack the device well before sending it.

Airbag24 tests the device on the test bench, replaces defective components, deletes the stored crash data and carries out a function 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 68402856AA get to Airbag24?

You send the device as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns your device to you by UPS.

Put the printed repair order in the parcel and pack the control unit shock-proof.