Airbag control unit with part number 77960-SZT-U820-M2

What does the airbag control unit 77960-SZT-U820-M2 do?

The airbag control unit 77960-SZT-U820-M2 is responsible for the restraint system (SRS) of Honda. It processes the measured values of the crash sensors, determines in a collision within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Reported faults appear on the airbag warning light.

During driving, the unit works unseen and only becomes noticeable once it detects a fault or registers an accident.

After an accident, it stores crash data and locks itself. Only a repair lifts the lock again.

Why does the control unit 77960-SZT-U820-M2 fail?

Stored crash data is the most common cause of a failure of the control unit 77960-SZT-U820-M2, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Otherwise, electronic and connection problems come into consideration.

The crash data remains stored until Airbag24 removes it during the repair.

Other causes at a glance:

• ageing of the electronic components
• poor solder joints
• moisture and rust at plug connections
• voltage spikes, for example from a jump start

How can you tell that the 77960-SZT-U820-M2 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently. Typical signs are also a message on the instrument cluster display and a diagnostic tool that cannot establish a connection to the control unit 77960-SZT-U820-M2.

• Airbag warning light lights up constantly or intermittently
• Message on the instrument cluster display
• Diagnostic tool does not find the control unit
• Fault memory remains after the attempt to clear it

In this state, airbags and seatbelt pretensioners may fail to trigger in an emergency. Therefore take the light seriously.

Which vehicles is the 77960-SZT-U820-M2 fitted in?

The control unit 77960-SZT-U820-M2 is fitted in these vehicles: Honda CR-Z ZF1 (2010-2016).

Below you will find the vehicles stored for this part number.

• Honda CR-Z ZF1 (2010-2016)

A comparison of the part number on the label of the removed unit with this page only confirms the identity of the unit. Reading out the fault memory, on the other hand, shows whether the control unit itself is affected or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-SZT-A011, 77960-SZT-A011-M2.

How does the repair of the 77960-SZT-U820-M2 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit 77960-SZT-U820-M2. Next, create the repair order online and send the unit in well packed. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Then the unit is sent back to you.

The time stated refers exclusively to the work done at Airbag24, not to removal or shipping.

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-SZT-U820-M2 get to Airbag24?

The control unit 77960-SZT-U820-M2 reaches Airbag24 as a parcel; alternatively, you book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Enclose the printed repair order with the parcel and pad the unit shockproof.