Airbag control unit with part number 68402851AD

What does the airbag control unit 68402851AD do?

The airbag control unit 68402851AD works with the restraint system (SRS) in Jeep. It reads the crash sensors, calculates the required deployment within milliseconds in the event of an accident and monitors the system permanently. After an accident it stores crash data and locks itself.

The device reports faults via the airbag warning light, which appears in the instrument cluster.

Monitoring runs unobtrusively in the background until a fault occurs.

Why does the control unit 68402851AD fail?

The most common cause is crash data that remained in the memory after an accident in which no airbag deployed; a standard scanner does not remove it. Ageing components, cold solder joints, moisture, corrosion and voltage spikes can also contribute.

The memory retains these entries even when no restraint devices were triggered in the vehicle.

Other causes to consider are:

• electronic components that age over time
• cold solder joints on the circuit board
• moisture and corrosion at the plug connections
• voltage spikes from a weak battery or a jump start

Such faults cannot always be traced to one specific location, so reading out the fault memory helps.

How can you tell that the 68402851AD is defective?

The airbag warning light stays on permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, and the fault memory remains. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light may also appear only intermittently; its disappearance does not mean the fault has been fixed, only that the fault is not being displayed at the moment.

A diagnostic tool without a connection can also be caused by a cable or plug. Only the read-out fault memory will tell you more.

Which vehicles is the 68402851AD fitted in?

The control unit 68402851AD is fitted in these vehicles: Jeep Compass MP (2016-2020) and MP Facelift (from 2020).

The vehicle list follows below, as far as it is available to us.

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

Comparing the label with this page only tells you that it is the same unit. Have the fault memory read out in advance, because only it shows whether the control unit or 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 68402851AD work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next create a repair order online and send in the unit well packed.

At Airbag24 the unit goes through a check on the test bench; defective components are replaced, the crash data is erased and a functional test follows. Processing usually takes 3–4 working days.

Afterwards you get your own unit back. 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 68402851AD get to Airbag24?

You send the unit as a parcel or, for a UPS collection for an extra charge, have it picked up. The return after the repair is made by UPS.

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