Airbag control unit with part number 51765169

What does the airbag control unit 51765169 do?

The control unit 51765169 coordinates the restraint system for Lancia and Fiat as the SRS control unit. It reads the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners to trigger, and monitors the entire system continuously. After an accident, it stores crash data and locks itself.

The device detects faults independently and shows them via the airbag warning light in the instrument cluster. At the same time, it creates an entry in the fault memory.

Monitoring therefore runs not only in accident situations but throughout the entire operation. The function of the system relies on this.

Why does the control unit 51765169 fail?

The most common cause is crash data that remains in memory after an accident, even if no airbag has triggered; a commercially available diagnostic tool cannot remove it. In addition, ageing electronics, moist or corroded plug connections, cold solder joints and voltage spikes can cause the failure.

The entry is created in the accident and remains in the unit afterwards, regardless of whether an airbag was triggered. That makes the crash data the obvious starting point for the fault search.

The other causes lie in the electronics themselves or at their connections. A weak battery or a jump start can produce voltage spikes that affect the unit.

How can you tell that the 51765169 is defective?

A defect on the 51765169 shows up as an airbag warning light that lights up permanently or intermittently, as a fault message in the instrument cluster, as a diagnostic tool without a connection to the control unit, and as a fault memory that cannot be cleared.

These indications are a warning sign, because airbags and seatbelt pretensioners could fail to deploy in an emergency. It is therefore worth having the finding clarified promptly.

The warning light explicitly signals a fault in the restraint system, and it lights up as soon as the unit detects a fault.

Which vehicles is the 51765169 fitted in?

The SRS control unit 51765169 is fitted in these vehicles: Lancia Musa 350 (2007-2012) and 350 (2004-2007); Fiat Idea 350 (2004-2005) and 350 Facelift (2005-2008).

The following overview shows the vehicles recorded for this part number in our data.

• Lancia Musa 350 (2007-2012)
• Lancia Musa 350 (2004-2007)
• Fiat Idea 350 (2004-2005)
• Fiat Idea 350 Facelift (2005-2008)

First compare the part number on the label of the removed unit with this page. That confirms that you have the right unit in front of you. Then have the fault memory read out, because only this log shows whether the control unit is defective or whether a plug or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 51716748, 51752040, 51760853, 51768656, 51801205, 51816902.

How does the repair of the 51765169 work?

You read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit 51765169. Then you create a repair order online and send the well-packed unit in.

Airbag24 examines the unit on the test bench, replaces defective components, erases the stored crash data and runs a function test. The unit then returns to you.

For testing, repairing and checking at Airbag24, expect usually 3–4 working days. 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 51765169 get to Airbag24?

You hand over the control unit 51765169 either as a parcel or via a booked UPS collection, which is available for an extra charge. Airbag24 then sends the repaired unit back by UPS.

You pack the unit shock-resistant, and you put the printed repair order into the parcel.