Airbag control unit with part number P8635A248

What does the airbag control unit P8635A248 do?

The P8635A248 forms the control centre of the restraint system (SRS) of Mitsubishi. It captures the signals from the crash sensors, evaluates them and, in a collision, decides which airbags and seatbelt pretensioners are triggered. At the same time it monitors the system and reports faults on the airbag warning light.

This monitoring runs in the background. That way the system is prepared for an emergency.

After an accident the unit stores crash data and locks itself. Only a repair lifts the lock.

Why does the control unit P8635A248 fail?

Stored crash data from an accident is the most common cause, even if no airbag was triggered. Normal diagnostic tools cannot delete it. In addition, ageing components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes come into question as causes.

From outside, a vehicle does not show whether crash data is stored in the control unit. That is exactly why reading out the fault memory is the first step.

The other causes mainly concern electronics and plug connectors. Components age, solder joints can go cold, and moisture or corrosion impairs contacts. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the circuit.

How can you tell that the P8635A248 is defective?

Typical is an airbag warning light in the instrument cluster that lights up permanently or intermittently, accompanied by an error message. In addition, the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be cleared. Then airbags and seatbelt pretensioners may possibly fail to deploy in an emergency.

The warning light is a clear signal from the vehicle and not a minor matter. Only an inspection of the fault memory shows what is behind it.

If the message returns after the fault memory has been cleared, this points to a cause that is still present.

Which vehicles is the P8635A248 fitted in?

The list will tell you whether your own vehicle comes into question. The P8635A248 is fitted in these vehicles: Mitsubishi Lancer CY (2007-2017).

Vehicles known for this part number are listed here:

• Mitsubishi Lancer CY (2007-2017)

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

Also read out the fault memory in advance. Only this log 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 P8635A146, P8635A168, TARME1308R0924, TARME2937R0152.

How does the repair of the P8635A248 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create the repair order online and send the well-packed unit in; Airbag24 then takes over testing, repair and test.

On the test bench the unit is checked, defective components are replaced, the crash data is deleted and the function test is carried out. Processing at Airbag24 usually takes 3–4 working days. Afterwards your own unit goes back to you.

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 P8635A248 get to Airbag24?

You send the unit to Airbag24 as a parcel or arrange a UPS collection for an extra charge. The return of the unit after the repair is made by UPS.

Place the printed repair order in the parcel and pack the control unit shock-proof before dispatch.