Airbag control unit with part number 77960-TLA-H230-M4

What does the airbag control unit 77960-TLA-H230-M4 do?

The airbag control unit 77960-TLA-H230-M4 coordinates the restraint system (SRS) of Honda. It collects the messages from the crash sensors, decides within milliseconds in a crash on the triggering of airbags and seatbelt pretensioners, and checks the system continuously. After an accident, it stores crash data and goes into a lock state.

The unit makes the decision independently according to stored criteria.

It reports faults in the system via the airbag warning light in the instrument cluster and additionally records them in the fault memory.

Why does the control unit 77960-TLA-H230-M4 fail?

The most common cause is stored crash data after an accident, even if no airbag has been triggered. A normal diagnostic tool does not make it disappear. Other causes are aged electronics, cold solder joints, moisture and corrosion on plugs, and voltage spikes from weak batteries or jump-starting.

Crash data stays stored until it is deliberately erased, and that happens during the repair. The memory cannot be seen from the outside.

The other triggers lie in the electronics themselves. Components age, solder joints can remain cold, and moisture or corrosion in the plug connections disturb the contact.

How can you tell that the 77960-TLA-H230-M4 is defective?

A defect on the 77960-TLA-H230-M4 shows first on the airbag warning light in the instrument cluster. In addition, there are fault messages and problems with diagnosis.

Typical signs are:

• The airbag warning light lights up permanently or intermittently.
• A fault message appears in the instrument cluster.
• The diagnostic tool finds no connection to the control unit.
• The fault memory cannot be cleared.

With these signs, airbags and seatbelt pretensioners may possibly fail to trigger in an emergency. A prompt check is therefore advisable.

Which vehicles is the 77960-TLA-H230-M4 fitted in?

The control unit 77960-TLA-H230-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023).

The models in this assignment are listed here:

• Honda CR-V 5 (2018-2023)

Comparing the part number on the label with this page confirms that you have the right unit. The cause is not clarified by this, however: have the fault memory read out beforehand, because only this log shows whether the control unit is defective or whether a plug or cable is affected.

For the same vehicles, we also repair control units with the part numbers 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-SWAA-213-M1.

How does the repair of the 77960-TLA-H230-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit 77960-TLA-H230-M4. Next, create a repair order online and send the unit in well packed.

Airbag24 then checks the unit on the test bench, renews defective components and deletes the stored crash data. A function test follows, and the own unit goes back to you.

For the work at Airbag24, you should expect 3–4 working days as a rule.

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-TLA-H230-M4 get to Airbag24?

Either you send the control unit 77960-TLA-H230-M4 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-proof.