Airbag control unit with part number 9637176880

What does the airbag control unit 9637176880 do?

The airbag control unit 9637176880 carries out the evaluation of the restraint system (SRS) of Citroën and Peugeot in the vehicle. In an accident it decides within milliseconds which airbags and seatbelt pretensioners are triggered, and it checks the system while driving. It indicates faults via the airbag warning light.

The control reads the sensor values continuously. The evaluation determines when an event counts as an accident.

After an accident the control unit writes crash data into its memory and locks itself. In the workshop it is therefore one of the first addresses in every fault-finding.

Why does the control unit 9637176880 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at connectors, and voltage spikes from a weak battery or a jump start.

Crash data remains in the unit even if the accident was minor and no airbag opened. This very storage can cause the fault, although the rest of the vehicle runs without any irregularities.

The other causes concern ageing, contact and power supply. Components wear out over time, solder joints can go cold, and moisture attacks connectors.

Voltage spikes, for example when starting with a jump start, can also harm the electronics.

How can you tell that the 9637176880 is defective?

Signs are an airbag warning light that lights up permanently or intermittently, fault messages in the instrument cluster and a missing connection to the diagnostic tool. In addition, the fault memory cannot be cleared. Then airbags and seatbelt pretensioners may possibly not trigger in an emergency.

The typical signs at a glance:

• Airbag warning light on constantly or intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

With any one of these signs a prompt check is worthwhile. The light is the indication the system itself gives.

Which vehicles is the 9637176880 fitted in?

The airbag control unit 9637176880 is fitted in these vehicles: Citroën Berlingo I (1996-2002), I 2nd Facelift (2005-2009) and I 1st Facelift (2002-2005); Peugeot 106 S2 (1996-2003) and S1 (1991-1996); Citroën Berlingo Multispace I 2nd Facelift (2005-2009), I 1st Facelift (2002-2005) and I (1996-2002). The assignment is based on the part number printed on the unit.

The following overview names the vehicles for which this part number is stored.

• Citroën Berlingo I (1996-2002)
• Citroën Berlingo I 2nd Facelift (2005-2009)
• Citroën Berlingo I 1st Facelift (2002-2005)
• Peugeot 106 S2 (1996-2003)
• Peugeot 106 S1 (1991-1996)
• Citroën Berlingo Multispace I 2nd Facelift (2005-2009)
• Citroën Berlingo Multispace I 1st Facelift (2002-2005)
• Citroën Berlingo Multispace I (1996-2002)

Two points must be clarified before sending in. Compare the part number on the label with this page in order to confirm the right unit. Also have the fault memory read out, because only the result shows whether the control unit or a connector or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 550404200, 550538400, 550579000, 550747400, 550790400, 550892800.

How does the repair of the 9637176880 work?

Before removal, read out the fault memory and attach the log, then disconnect the battery. Only then remove the control unit, create an online repair order and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit, repairs defective components, deletes stored crash data and carries out a function test. Afterwards your own unit is sent back to you.

This sequence is binding for safety reasons. Keep to it before you work on the system.

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 9637176880 get to Airbag24?

You send the unit yourself as a parcel, or book a UPS collection for an extra charge. Airbag24 sends it back by UPS after the repair.

The printed repair order comes with the parcel, and you pack the unit shockproof.