Nissan Quest E52 airbag control unit repair

What is a Nissan Quest E52 airbag control unit?

In the Nissan Quest E52, the airbag control unit is the central control unit of the restraint system (SRS). It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners fire. After an accident it stores crash data and locks itself.

The unit is fitted in the Nissan Quest E52 (2011 to 2017). It comes from Bosch. During normal driving you notice nothing of it, because the control unit works unobtrusively in the background.

It continuously monitors sensors, airbag modules and seatbelt pretensioners as well as their squib circuits and wiring. If it detects a problem, the airbag warning light in the instrument cluster alerts you.

Why is the Nissan Quest E52 airbag control unit defective?

The most common cause is crash data left in the unit by an accident, even if no airbag was deployed; an ordinary diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

Crash data is also created when the airbags did not fire in a real emergency. It cannot be removed with a standard diagnostic tool.

An accident does not have to be involved, though. Over the years the electronic components age, solder joints develop hairline cracks, and moisture attacks the contacts of the connectors. Voltage spikes also put a strain on the circuit, for example after a jump start or with a weak battery.

A permanently lit airbag warning light, a fault memory that cannot be cleared, or a diagnostic tool that cannot connect point to a defective unit. In this case, have the control unit checked first before you examine other components on the Nissan Quest E52.

Common error codes for Nissan Quest E52 airbag control unit repair

The codes for the Nissan Quest E52 point to communication faults, to faults in the control unit itself or to stored crash data. They are read out with a diagnostic tool. Which of them appear in your case depends on the particular fault pattern.

The following codes and their meanings are known for this vehicle, among others. The list is not complete.

• B1100 → Internal fault of the airbag control unit
• B1209 → Frontal collision detected, crash data stored
• B1210 → Side collision detected, crash data stored
• U1000 → Fault in the CAN communication line
• U1010 → Control unit communication error on the CAN bus

A single code does not yet prove that the control unit is defective. Connectors, wiring or an airbag module may just as well be the cause. Only the inspection shows where the problem lies. Save the read-out report and enclose it with the shipment so that Airbag24 can carry out a targeted inspection.

What part numbers are available for the Nissan Quest E52 airbag control unit repair?

You will find the part number on the label of the control unit; it determines the exact version. Equipment and year of manufacture decide which number was fitted in a model series. The safest way is to read the number directly from the removed unit.

Below are part numbers that are known for the Nissan Quest E52; they make no claim to completeness.

• 98820-1JA0A
• 98820-3WS0A

Compare the number of your unit with these entries. This only clarifies whether it is the right unit. Whether it has a defect only becomes clear from reading out the fault memory or from the inspection at Airbag24.

The route to repair can be described as a sequence. First, have the fault memory read out. Then disconnect the battery, and only then remove the control unit. In the next step, create a repair order online, then send the unit to Airbag24. There it is inspected, repaired and tested, which usually takes 3–4 working days. Your own unit is returned to you. 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.