Airbag control unit with part number 68402851AC

What does the airbag control unit 68402851AC do?

The control unit 68402851AC belongs to the safety technology of Jeep, specifically to the restraint system (SRS). It registers via the crash sensors what happens in an accident and, in an emergency, triggers airbags and seatbelt pretensioners. It also checks itself and reports faults via the airbag warning light.

After an accident the unit stores crash data and locks itself. The self-check in everyday use remains invisible, because it runs in the background.

Why does the control unit 68402851AC fail?

In the 68402851AC stored crash data is the most common cause, even when no airbag has been triggered. Such data cannot be erased with an ordinary diagnostic tool. In addition there are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

After an accident the unit writes crash data into its memory, and this remains there until it is deliberately removed. Aged components also lose their reliability over time.

Cold solder joints can lose contact, while moisture and corrosion at plug connectors disturb the transitions. Voltage spikes, for example from a weak battery or a jump-start, round off the picture.

How can you tell that the 68402851AC is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as something is wrong with the 68402851AC. A fault message in the instrument cluster is added, and the diagnostic tool finds no connection to the control unit. In that case airbags and seatbelt pretensioners may not deploy in an emergency.

A fault memory that cannot be cleared is also among the signs.

A workshop gets a clear starting point for narrowing down the cause.

Which vehicles is the 68402851AC fitted in?

Only the part number is decisive, not any detail from the purchase contract. The 68402851AC is fitted in these vehicles: Jeep Compass MP (2016-2020) and MP Facelift (from 2020).

Below follow the vehicles stored for this part number.

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

Match the number on the label of the removed unit with this page. This only confirms the identity of the unit. Whether it is defective or a cable is the cause is shown only by the fault memory, which you therefore have read out beforehand.

For the same vehicles, we also repair control units with the part numbers A2C13501200.

How does the repair of the 68402851AC work?

The repair of the 68402851AC follows this order: first have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Then create the repair order online and send the unit in. At Airbag24 checking, repairing and testing usually takes 3–4 working days.

Only once the log is available is the battery disconnected. Removal follows afterwards, and you pack the unit carefully.

Airbag24 checks the unit on the test bench, replaces defective components, erases 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 68402851AC get to Airbag24?

You send the control unit 68402851AC as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS. The printed repair order goes in the parcel, and the unit is packed shock-resistantly.

A box with enough padding prevents the unit from being damaged in transit.