Airbag control unit with part number 98820-ZL70A

What does the airbag control unit 98820-ZL70A do?

The airbag control unit 98820-ZL70A is the central control unit of the restraint system (SRS) for Nissan. It evaluates the signals from the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the system continuously while the vehicle is in operation.

If the unit detects a fault, it shows this via the airbag warning light in the instrument cluster. Diagnosis therefore begins with the fault memory.

After an accident, the unit stores crash data and locks itself. The lock affects the function of the control unit as a whole, and every test takes this state into account.

Why does the control unit 98820-ZL70A fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. A standard diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Aged components and cold solder joints disturb the electrical connection inside the unit, increasingly over time. Moisture and corrosion have a similar effect at the contacts.

Voltage spikes arise, for example, from a weak battery or when a jump-start cable is connected, and can stress the electronics.

How can you tell that the 98820-ZL70A is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Error messages, a failed connection of the diagnostic tool and a fault memory that cannot be cleared are added to this.

• Airbag warning light lights up permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

In that case, the airbags and seatbelt pretensioners may fail to trigger in an emergency. Have the system checked promptly.

Which vehicles is the 98820-ZL70A fitted in?

The 98820-ZL70A is fitted in these vehicles: Nissan Frontier D40 (2005-2007) and D40 Facelift (2007-2015).

The following vehicles are recorded for this part number:

• Nissan Frontier D40 (2005-2007)
• Nissan Frontier D40 Facelift (2007-2015)

Compare the part number on the label of the removed unit with this page. This only shows that you have the correct unit. Whether the control unit itself is defective or a plug or cable is the cause can only be clarified by reading out the fault memory, which you should have done beforehand.

For the same vehicles, we also repair control units with the part numbers 98820 EB01D.

How does the repair of the 98820-ZL70A work?

The processing at Airbag24 usually takes 3–4 working days. Begin with reading out the fault memory, enclose the log, disconnect the battery and remove the control unit.

Then create a repair order online and send in the unit well packed. At Airbag24 it goes onto the test bench. Defective components are replaced, stored crash data is erased and a function test is carried out.

The unit is then returned 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 98820-ZL70A get to Airbag24?

You send the control unit 98820-ZL70A in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

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