Airbag control unit with part number 86250-21540

What does the airbag control unit 86250-21540 do?

The airbag control unit 86250-21540 is the central switching unit of the restraint system (SRS) in SsangYong. It evaluates the signals from the sensors, determines in a crash within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system throughout. After an accident it stores crash data and locks itself.

It indicates faulty states via the airbag warning light, so that you can recognise a defect.

The electronics work closely with the sensors and wiring; any fault in this chain can affect the system.

Why does the control unit 86250-21540 fail?

Stored crash data is the most common cause, even if no airbag was triggered in the accident. Other causes are aged components, cold solder joints, moisture and corrosion at plugs, and voltage spikes.

Crash data remains in the unit, and a normal diagnostic tool cannot erase it. For that very reason, briefly resetting the fault does not help.

The other causes are part of everyday life in a vehicle: electronics age, contacts become damp, and a weak battery or jump-starting can produce voltage spikes that stress the unit.

How can you tell that the 86250-21540 is defective?

A defect shows on the airbag warning light in the instrument cluster and in error messages. In an emergency, airbags and seatbelt pretensioners may then not trigger.

Typical signs are:

• The airbag warning light stays on permanently or only intermittently
• An error message appears in the instrument cluster
• The diagnostic tool does not get a connection to the control unit
• The fault memory cannot be cleared

The light checks itself when the ignition is switched on. If it stays on afterwards, have the fault memory read out.

A problem with a plug or cable can cause the same display; only reading out the fault memory tells the two possibilities apart.

Which vehicles is the 86250-21540 fitted in?

The control unit 86250-21540 is fitted in these vehicles: SsangYong Rodius A200 (2013-2019); SsangYong Stavic A200 (2013-2019). The assignment applies to SsangYong.

The vehicles at a glance:

• SsangYong Rodius A200 (2013-2019)
• SsangYong Stavic A200 (2013-2019)

Comparing the part number on the label of the removed unit with this page confirms that you have the right unit. Before removal, however, reading out the fault memory is the step that shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0 285 012 651, 5WY64004, 8625021030, 8625021031.

How does the repair of the 86250-21540 work?

Read out the fault memory first and attach the log. Then disconnect the battery, remove the control unit, create the repair order online and send the unit in well packed.

Airbag24 tests the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Your own unit is then returned to you.

Processing at Airbag24 usually takes 3–4 working days and covers only testing, repairing and function-checking.

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 86250-21540 get to Airbag24?

Shipping goes either as a package to Airbag24 or with a UPS collection that is booked for an extra charge. The return after the repair follows by UPS.

The printed repair order goes into the package, and the unit needs shockproof packing.