Airbag control unit with part number 985102676R

What does the airbag control unit 985102676R do?

The airbag control unit 985102676R is the central control unit of the restraint system of Renault. It evaluates the signals from the crash sensors, determines in the event of an accident the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident, it stores crash data and locks itself.

The evaluation must be complete within milliseconds so that the protective systems respond in time. Until then, the unit works in the background without a pause.

The unit reports faults in the system via the airbag warning light in the instrument cluster.

Why does the control unit 985102676R fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; it cannot be removed with an ordinary diagnostic tool. Aged components, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes may also be the cause.

Crash data remains in the unit until it is deleted. Airbag24 takes care of this as part of the repair.

The other causes act over time. Electronic components age, solder joints can develop poor contact, and moisture promotes corrosion on the plugs. Voltage spikes, for example from a weak battery or a jump-start, additionally load the circuits.

How can you tell that the 985102676R is defective?

A defect shows itself on the 985102676R through the airbag warning light, which is on permanently or intermittently, and through fault messages in the instrument cluster. In addition, the diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared.

The typical signs at a glance:

• Airbag warning light, permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may possibly not trigger. The light shows the defect, so prompt action is advisable.

Which vehicles is the 985102676R fitted in?

The control unit 985102676R is fitted in these vehicles: Renault Twingo III (2014-2024).

This list names the vehicles on record for the part number:

• Renault Twingo III (2014-2024)

Compare the part number on the label of the removed unit with this page. That only shows that you have the right unit in front of you. The fault memory is read out before removal, because only the 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 402787B3, 985100858R, 985101168R, 985101180R, 985101322R, 985101808R.

How does the repair of the 985102676R work?

You read the fault memory out, enclose the log, disconnect the battery and only then remove the control unit. Afterwards you create a repair order online and send in the well-packed unit. Airbag24 generally needs 3–4 working days to process it.

Airbag24 examines the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test.

The unit then returns 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 985102676R get to Airbag24?

You can send the control unit 985102676R as a parcel or book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair. The printed repair order goes into the parcel, and the unit is packed shockproof.

A suitable box with padding ensures the unit is well protected in transit.