Airbag control unit with part number 77960-TLA-L320-M4

What does the airbag control unit 77960-TLA-L320-M4 do?

The airbag control unit 77960-TLA-L320-M4 controls the restraint system (SRS) in vehicles from Honda. It evaluates what the crash sensors report and determines in an accident which airbags and seatbelt pretensioners are triggered.

The evaluation takes place within milliseconds. In operation the unit continuously monitors the system and indicates faults with the airbag warning light.

After an accident the control unit writes crash data to its memory and then locks itself. This makes the memory an important starting point for every repair.

Why does the control unit 77960-TLA-L320-M4 fail?

Above all, stored crash data causes the failure, even if the airbag has not deployed. This data cannot be deleted with a normal diagnostic tool.

Airbag24 deletes the crash data during the repair. Otherwise, general causes come into question:

• age-related weaknesses in the electronics
• cold solder joints inside the unit
• moisture or corrosion at plug connections
• voltage spikes, for example when starting with a weak battery

How can you tell that the 77960-TLA-L320-M4 is defective?

A defect shows as an airbag warning light that stays on permanently or at times, as a fault message in the instrument cluster, and as a diagnostic tool that makes no contact. A fault memory that cannot be cleared also belongs here.

• The airbag warning light stays on permanently or comes on at times
• fault message in the instrument cluster
• no connection to the diagnostic tool
• fault memory cannot be cleared

With these signs, do not wait. In an emergency, airbags and seatbelt pretensioners may possibly not trigger.

Which vehicles is the 77960-TLA-L320-M4 fitted in?

The control unit 77960-TLA-L320-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023). The part number on the unit decides on the correct assignment.

The affected vehicles are listed here.

• Honda CR-V 5 (2018-2023)

Before removal, compare the part number on the label with the list. Have the fault memory read out beforehand as well, so you know whether the control unit is defective or a plug or cable is the cause.

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-L320-M4 work?

First read out the fault memory and enclose the log. Then disconnect the battery and remove the control unit. Next create a repair order online and send the unit in well packed.

At Airbag24 the control unit is first checked, then repaired and freed of stored crash data. A function test follows, and then your own unit goes back to you. Processing at Airbag24 takes 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-L320-M4 get to Airbag24?

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

The printed repair order goes into the parcel. Pack the control unit shockproof.