Airbag control unit with part number 77960-SHJ-L022-M1

What does the airbag control unit 77960-SHJ-L022-M1 do?

The airbag control unit 77960-SHJ-L022-M1 forms the switching centre of the restraint system (SRS) of Honda. It checks the signals from the crash sensors and decides in an accident, within a fraction of a second, which airbags and seatbelt pretensioners are triggered.

The system constantly monitors the control unit itself. It indicates faults via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself.

Why does the control unit 77960-SHJ-L022-M1 fail?

Stored crash data from an accident is the most common cause, even if no airbag was triggered. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible.

The crash data remains in memory after the event. An ordinary diagnostic tool cannot delete it, which is why Airbag24 deletes it during the repair.

The other causes concern the electronics themselves. Components age over time, solder joints can go cold, and moisture or corrosion at plugs disturbs the contact.

Voltage spikes also stress the unit, for example when the battery is weak or the car is started with jump leads.

How can you tell that the 77960-SHJ-L022-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears. In addition, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared. In such a case, airbags and seatbelt pretensioners may not deploy in an emergency.

The signs at a glance:

• airbag warning light that lights up permanently or intermittently
• error message in the instrument cluster
• no connection of the diagnostic tool to the control unit
• fault memory that cannot be cleared

The warning light is the hint the system itself gives. Anyone who takes it seriously has the vehicle checked promptly.

Which vehicles is the 77960-SHJ-L022-M1 fitted in?

This control unit 77960-SHJ-L022-M1 was installed in these vehicles: Honda Odyssey 4th generation (2008-2013).

The list follows here:

• Honda Odyssey 4th generation (2008-2013)

First compare the part number on the label of the removed unit with this page; this only confirms that it is the right unit. Then have the fault memory read out, because the log shows whether the control unit is defective or whether a connector or cable is the cause.

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-SHJ-L022-M1 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, remove the control unit and create a repair order online. Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test.

On your side the sequence is mandatory: first the fault memory, then the battery, only then removal. Afterwards you send the carefully packed unit.

At Airbag24, checking, repairing and testing usually take 3–4 working days. Afterwards your own unit is sent 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-SHJ-L022-M1 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair UPS brings the control unit from Airbag24 back to you.

Put the printed repair order into the parcel and pack the unit shock-proof.