Airbag control unit with part number 77960-SWA-E240-M4

What does the airbag control unit 77960-SWA-E240-M4 do?

The airbag control unit 77960-SWA-E240-M4 controls the restraint system (SRS) of Honda. It processes the measured values from the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors all components. It indicates faults via the airbag warning light. After an accident it stores crash data and locks itself.

The sensors supply signals continuously, and the control unit evaluates them without interruption. Every deployment depends on this.

The lock after an accident is a property of the unit and part of its design.

Why does the control unit 77960-SWA-E240-M4 fail?

The most common cause is crash data stored after an accident, even when no airbag has deployed. Normal diagnostic tools cannot remove this data.

• Aged electronic components that produce faults after prolonged use
• Cold solder joints on the circuit board
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or a jump start

Airbag24 deletes the crash data during the repair. That is part of the work on the unit and nothing you need to do beforehand.

How can you tell that the 77960-SWA-E240-M4 is defective?

The airbag warning light in the instrument cluster is the most important warning signal; it stays on permanently or intermittently. A fault message, a missing connection to the diagnostic tool or a fault memory that cannot be cleared may accompany it. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

When the warning light comes on, it matters to narrow down the cause. The control unit is not the only possibility, because cables or plugs can produce similar symptoms.

A fault memory that cannot be cleared at all is a clear indication that something is wrong in the control unit itself.

Which vehicles is the 77960-SWA-E240-M4 fitted in?

The 77960-SWA-E240-M4 is fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

The following list shows the vehicles that Airbag24 assigns to this unit.

• Honda CR-V 3 RE (2006-2012)

Have the fault memory read out before you remove the control unit. Afterwards compare the label on the removed unit with the part number, so you know for certain which unit you have in front of you.

For the same vehicles, we also repair control units with the part numbers 77960-SWA-G214-M4, 77960-SWA-S21, 77960-SWA-S214-M4, 77960-T0AA-110-M1, 77960-TA0-A031, 77960-TLA-A25.

How does the repair of the 77960-SWA-E240-M4 work?

Airbag24 generally needs 3–4 working days for checking, repairing and testing. Before that, you read out the fault memory, enclose the log and disconnect the battery. Then you remove the control unit and create a repair order online.

Pack the removed unit carefully so that it arrives undamaged.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test. Your own unit then 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 77960-SWA-E240-M4 get to Airbag24?

For the 77960-SWA-E240-M4 there is shipping as a parcel or a UPS collection, which is booked for an extra charge. The return after the repair is made by UPS.

The printed repair order goes into the parcel, and the unit should be packed shock-proof.