Honda e:Ny1 1st generation airbag control unit repair

What is a Honda e:Ny1 1st generation airbag control unit?

In the Honda e:Ny1 1st generation, the airbag control unit is the central control unit of the restraint system (SRS). It evaluates what the crash sensors report and, in an accident, deploys the appropriate airbags and seatbelt pretensioners within milliseconds. During normal operation it monitors the entire system continuously and indicates faults via the airbag warning light.

The control unit is fitted in the Honda e:Ny1 1st generation (since 2024). It works unobtrusively in the background until it detects a fault or an accident has occurred.

If there has been an accident, the unit stores crash data and locks itself. The restraint system is then no longer reliably available to you, and the warning light in the instrument cluster stays on.

Why is the Honda e:Ny1 1st generation airbag control unit defective?

A defective Honda e:Ny1 1st generation airbag control unit usually makes itself noticed through the airbag warning light. Most often the cause is crash data stored after an accident, even if no airbag deployed, and an ordinary diagnostic tool cannot remove it. Ageing electronic components, cold solder joints, moisture and voltage spikes are also possible causes.

What do you notice as the driver? The warning light on the dashboard stays on permanently and does not go out even after a restart. When the unit is read out, it turns out that the entries in the fault memory cannot be cleared, or the diagnostic tool cannot establish a connection to the control unit at all.

Various causes can lie behind these observations. Components age, solder joints turn cold over time, and moisture and corrosion build up on connectors. Voltage spikes also put a strain on the electronics, for example when the battery is weak or the car has been jump-started. Such damage often only becomes apparent when the system reports its first fault.

Especially in a vehicle with no accident history, it is worth having the control unit checked before you replace other parts of the system.

Common error codes for Honda e:Ny1 1st generation airbag control unit repair

The codes in the Honda e:Ny1 1st generation reveal which area of the restraint system the fault lies in: in the control unit itself, in communication, in the power supply or in stored crash data. Which entries you see depends on the type of fault and on the diagnostic tool used.

The following codes are known for this vehicle:

• 87-31 → Internal fault in the SRS control unit
• 8-1 → Internal fault in the SRS control unit
• 91-1x → Internal fault in the SRS control unit
• B1000 → Malfunction in the airbag control unit
• B1001 → Memory error in the airbag control unit
• 5-1 → Collision detected, crash data stored
• U0151 → Communication with the control unit lost
• A1-1x → Faulty supply voltage of the system

The codes are read out with a diagnostic tool. A single code does not necessarily mean that the control unit is defective, since connectors, wiring or an airbag module may just as well be the cause. Only testing the unit brings certainty.

What part numbers are available for the Honda e:Ny1 1st generation airbag control unit repair?

The label on your Honda e:Ny1 1st generation airbag control unit shows the part number, which defines the exact version. Depending on equipment and year of manufacture, there are different numbers within one model series, so this information is important for the repair order.

Read the number directly from the label and enter it in the repair order. That way Airbag24 knows exactly which unit it is dealing with.

This is how you get to the repair: first have the fault memory read out. Then disconnect the battery and remove the control unit. Next, create a repair order online and send in the unit. At Airbag24 it is usually tested, repaired and checked within 3–4 working days. 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.