Airbag control unit with part number 68400424AC

What does the airbag control unit 68400424AC do?

The airbag control unit 68400424AC forms the central control unit of the restraint system (SRS) in Jeep. It processes the signals from the crash sensors, triggers the appropriate airbags and seatbelt pretensioners in an accident, and monitors the system continuously.

The evaluation takes place within a few milliseconds of an impact being measured. In doing so, the unit relies on the measured values it reads continuously.

Detected faults are indicated via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 68400424AC fail?

The most common reason for the 68400424AC failing is crash data stored in the control unit after an accident, even if no airbag has deployed. Other causes include aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. The other causes act on the electronics or their connections: components age, solder joints can go cold, and moisture or corrosion affects plugs.

Voltage spikes, for example from a weak battery or a jump start, additionally load the circuit.

How can you tell that the 68400424AC is defective?

A defect on the 68400424AC shows itself through the airbag warning light in the instrument cluster, through fault messages, or because the diagnostic tool cannot reach the control unit. Typical signs are:

• Airbag warning light lights up constantly or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not establish a connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then not deploy. Therefore have the system checked promptly.

Which vehicles is the 68400424AC fitted in?

The control unit 68400424AC is fitted in these vehicles: Jeep Wrangler JL (from 2018).

The assignment of the vehicles is shown in the following list:

• Jeep Wrangler JL (from 2018)

Compare the part number on the label of the removed unit with this page. That only confirms that you have the right unit in front of you. Also have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a 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 68400424AC work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Send the unit in well packed. At Airbag24, checking, repairing and testing usually take 3–4 working days.

The reading out and disconnecting of the battery before removal serve safety, so the order must be kept. Airbag24 examines the unit on the test bench, finds defective components and repairs them, erases stored crash data and carries out a function test.

The unit then goes back to you. The 3–4 working days refer only to this work at Airbag24. 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 68400424AC get to Airbag24?

You send the control unit 68400424AC as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.