Airbag control unit with part number 68437721AB

What does the airbag control unit 68437721AB do?

The airbag control unit 68437721AB is the central control unit of the restraint system in Jeep vehicles. It evaluates the crash sensors and decides in an accident, within milliseconds, whether airbags and seatbelt pretensioners are triggered. It indicates faults via the airbag warning light. After an accident, it stores crash data and locks itself.

Monitoring runs throughout every journey.

Why does the control unit 68437721AB fail?

On the 68437721AB, the most common cause is a memory with crash data, even if no airbag fired in the accident. A normal diagnostic tool does not remove this data. Further causes include component ageing, moisture on plugs, cold solder joints and voltage spikes.

The further causes in detail include:

• Ageing components on the electronics board
• Cold solder joints that interrupt the contact
• Moisture or corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump-starting

That is why checking the crash data belongs at the start of every fault search.

A diagnosis on the vehicle establishes which of these points applies.

How can you tell that the 68437721AB is defective?

A defect in the 68437721AB reveals itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. If an error message also appears, the diagnostic tool fails to connect, or the fault memory stays put, the fault is clearly recognisable. In this case, airbags and seatbelt pretensioners may not be able to fire.

You can watch for the following:

• The airbag warning light in the instrument cluster stays on continuously
• The display in the instrument cluster reports a fault
• The diagnostic tool cannot find the control unit
• Stored faults do not disappear when erased

The warning light is a direct signal from the system and not a guess.

If in doubt, only a diagnosis helps, because it uncovers the exact cause of the message.

Which vehicles is the 68437721AB fitted in?

The 68437721AB is fitted in a range of vehicles at Jeep. It is installed in these vehicles: Jeep Wrangler JL (from 2018).

The following overview lists the vehicles we know of for this part number.

• Jeep Wrangler JL (from 2018)

Compare the part number on the label of the removed unit with this page. That only establishes that you have the right unit in front of you. Also have the fault memory read out beforehand, because only that 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 68398609AB, P68003421AB.

How does the repair of the 68437721AB work?

First, have the fault memory of the 68437721AB read out, and enclose its log. Only then disconnect the battery and remove the control unit. Create the repair order online afterwards, before sending the unit off well packed.

Airbag24 deletes the stored crash data, checks the unit on the test bench, repairs defective components and runs a functional test. Your own unit is then returned to you.

Processing at Airbag24 usually takes 3–4 working days, and this time covers only the work in house.

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 68437721AB get to Airbag24?

The 68437721AB reaches Airbag24 either as a parcel you send yourself or via a UPS collection booked for an additional charge. UPS also handles the return journey after the repair.

Place the printed repair order in the parcel. The unit must be packed shock-proof before it goes on its way.