Airbag control unit with part number 77960-SLE-H820-M3

What does the airbag control unit 77960-SLE-H820-M3 do?

The airbag control unit 77960-SLE-H820-M3 controls the restraint system of Honda as an SRS control unit. It evaluates acceleration and sensor signals and decides in a collision which airbags and seatbelt pretensioners fire. After an accident it stores crash data and locks itself.

Between events the control unit monitors its sensors, connections and firing circuits. If it detects a deviation, it stores the fault and displays it via the airbag warning light.

This keeps the state of the restraint system visible in the instrument cluster.

Why does the control unit 77960-SLE-H820-M3 fail?

Crash data from an earlier accident are the most common cause, even if no airbag was deployed. Further causes lie in ageing, moisture and electrical voltage spikes. A standard diagnostic tool cannot erase the crash data on the control unit 77960-SLE-H820-M3.

Crash data document the event from the perspective of the control unit. They stay stored even when no trace of the accident remains visible on the vehicle.

Further causes that may affect the unit:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 77960-SLE-H820-M3 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the control unit 77960-SLE-H820-M3 has detected a fault. In addition there is a fault message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared. In that case airbags and seatbelt pretensioners may possibly not deploy in an emergency.

The light and the fault message are the two indications the driver sees directly. Both come from the control unit itself, so a check is unavoidable.

Which vehicles is the 77960-SLE-H820-M3 fitted in?

The control unit 77960-SLE-H820-M3 is fitted in these vehicles: Honda Odyssey 4th generation (2008-2013). The decisive factor here is the make Honda.

The vehicles in the list are those known to us for this part number.

• Honda Odyssey 4th generation (2008-2013)

Comparing the part number on the label with this page confirms that you have removed the correct unit. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-SHJ-A013-M1, 77960-SHJA020M1, 77960-SHJC-012-M1, 77960-TK8-A011-M1.

How does the repair of the 77960-SLE-H820-M3 work?

Repair at Airbag24 usually takes 3–4 working days for checking, repairing and testing. Beforehand, read out the fault memory and attach the log, then disconnect the battery and remove the control unit 77960-SLE-H820-M3. Afterwards create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and performs a function test. Afterwards the 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 77960-SLE-H820-M3 get to Airbag24?

You send in the control unit 77960-SLE-H820-M3 as a parcel, or alternatively book a UPS collection for an extra charge. Airbag24 sends the repaired unit back to you by UPS.

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