Airbag control unit with part number P68148040AC

What does the airbag control unit P68148040AC do?

The airbag control unit P68148040AC is the central control unit of the restraint system (SRS) in Jeep. It evaluates the crash sensor data, determines within milliseconds in an accident which airbags and seatbelt pretensioners are to be triggered, and checks the system constantly. It shows faults via the airbag warning light; after an accident it stores crash data and locks itself.

The constant checking runs independently of driving.

A fault in this unit therefore affects the entire restraint system, not just a single sensor.

Why does the control unit P68148040AC fail?

The most common cause with the P68148040AC is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot delete it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, as well as voltage spikes.

Besides the crash data, these causes come into consideration:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes caused by a weak battery or jump-starting

Electronics lose performance over time, solder joints can lose strength, and moisture reaches the contacts. Such damage can show up in several places at once.

Crash data, by contrast, is a consequence of the accident and says nothing about the condition of the electronics.

How can you tell that the P68148040AC is defective?

A defect in the P68148040AC shows up as the airbag warning light in the instrument cluster staying on permanently or intermittently, as a fault message in the instrument cluster, as a diagnostic tool with no connection to the control unit, or as a fault memory that cannot be cleared. In that case, airbags and seatbelt pretensioners may not trigger in an emergency.

If the airbag warning light does not go out after switching on the ignition, or it comes back while driving, that is a clear prompt for an inspection.

A lost connection to the diagnostic tool is a further sign. If it breaks off, a wire or a connector can also be the cause, which is why the readout provides the actual answer.

Which vehicles is the P68148040AC fitted in?

The control unit P68148040AC is fitted in these vehicles: Jeep Compass MK (2007-2010) and MK Facelift (2011-2016).

The vehicle list in detail:

• Jeep Compass MK (2007-2010)
• Jeep Compass MK Facelift (2011-2016)

Have the fault memory read out before removal; the result shows whether the control unit is defective or whether a connector or cable is the cause. Also compare the part number on the label of the removed unit with this page; this only confirms that you have the correct unit.

For the same vehicles, we also repair control units with the part numbers P68186642AD.

How does the repair of the P68148040AC work?

For the repair of the P68148040AC a fixed sequence applies: first have the fault memory read out and attach the log, then disconnect the battery and only after that remove the control unit. Then create a repair order online and send the unit in well packed. Airbag24 needs 3–4 working days as a rule for checking, repairing and testing.

Airbag24 checks the unit on the test bench, repairs the affected components, deletes the crash data and carries out a function test.

You receive your own unit back afterwards.

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 P68148040AC get to Airbag24?

You send the control unit P68148040AC as a parcel or, for an extra charge, book a UPS collection. Airbag24 returns it by UPS after the repair.

Put the printed repair order into the parcel, and pack the unit shock-proof.