Airbag control unit with part number 68029747AA

What does the airbag control unit 68029747AA do?

The airbag control unit 68029747AA is the central control unit of the restraint system (SRS) in Dodge. It evaluates the signals from the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. After an accident, it stores crash data and locks itself.

During normal driving, the unit works unobtrusively in the background. It continuously monitors the power supply, the sensors and the triggering of the igniters, so the system is ready in an emergency.

If it detects a fault, it creates an entry in the fault memory and shows the finding via the airbag warning light in the instrument cluster. Airbag24 removes the crash data during the repair.

Why does the control unit 68029747AA fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

The entry with the crash data remains in memory even when the vehicle drives normally again afterwards. It cannot be removed with ordinary tools.

The other causes tend to develop gradually. Ageing components and cold solder joints cause intermittent faults, while moisture and corrosion gradually attack plug connections.

Voltage spikes also stress the electronics. A weak battery or an improper jump start can change the on-board voltage sharply for a short time.

How can you tell that the 68029747AA is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The airbag warning light in the instrument cluster is the clearest warning sign. It stays on permanently or only comes on from time to time.

A fault message may also appear on the display. If no connection to the diagnostic tool can be established, that is a further indication of a fault in the system.

In an emergency, airbags and seatbelt pretensioners may not deploy. An early check is therefore the right step.

Which vehicles is the 68029747AA fitted in?

The airbag control unit 68029747AA is fitted in these vehicles: Dodge Sprinter NCV3 (2007-2009).

The list shows the vehicles that Airbag24 has assigned to this part number.

• Dodge Sprinter NCV3 (2007-2009)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit.

Also have the fault memory read out before removal. Only the result shows whether the control unit itself is faulty or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 68029750AA, 68029771AA.

How does the repair of the 68029747AA work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit 68029747AA. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. The unit you sent in is then returned to you.

Keep to the order of steps during removal, because the battery must be disconnected beforehand.

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 68029747AA get to Airbag24?

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

Put the printed repair order into the parcel and pack the control unit shockproof before you hand it over.