Mercedes-Benz G-Class W465 G 580 EQ airbag control unit repair

What is a Mercedes-Benz G-Class W465 G 580 EQ airbag control unit?

The airbag control unit is the central control unit of the restraint system (SRS) in the Mercedes-Benz G-Class W465 G 580 EQ. It evaluates the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners to deploy, and reports faults via the airbag warning light.

The restraint system consists of several assemblies that work closely together. The sensors report acceleration and impact, the airbags and seatbelt pretensioners provide the protection, and the control unit links the two. It evaluates the data from all sensors together and only deploys when the situation calls for it.

The control unit is fitted in the Mercedes-Benz G-Class W465 G 580 EQ (since 2024). After an accident it stores crash data and locks itself. A control unit in this state cannot simply be reused; it has to be tested and repaired. This is exactly what Airbag24 specialises in: we repair your own unit and send it back to you.

Why is the Mercedes-Benz G-Class W465 G 580 EQ airbag control unit defective?

The most common cause is crash data stored after an accident, even if no airbag deployed; a normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

A typical sign is an airbag warning light that stays on permanently. Often the fault memory cannot be cleared, or the diagnostic tool cannot connect to the control unit at all.

Electronic components age over the years, and solder joints can crack from constant temperature changes and vibration while driving. Moisture makes contacts on connectors corrode and can lead to malfunctions. Voltage spikes occur, for example, with a weak battery or when jump-starting, and can damage sensitive components in the control unit.

Common error codes for Mercedes-Benz G-Class W465 G 580 EQ airbag control unit repair

The error codes for the Mercedes-Benz G-Class W465 G 580 EQ airbag control unit indicate internal control unit faults, voltage that is too low or too high, lost communication, stored crash data and interrupted squib circuits. Which code appears depends on which area of the restraint system is affected.

The following codes are common on this vehicle:

• B1000 → Airbag control unit fault
• B2500 → Internal control unit fault
• B1561 → Deployment threshold exceeded, crash data stored
• U0151 → Communication with the airbag control unit lost
• B1315 → Voltage at the control unit too low
• B1318 → Voltage at the control unit too high
• B1420 → Driver airbag squib circuit interrupted
• B1421 → Passenger airbag squib circuit interrupted

Error codes are read out with a diagnostic tool. However, a code alone does not reliably show that the control unit is defective: connectors, wiring or an airbag module can also be the cause. Only testing clarifies where the fault actually lies.

What part numbers are available for the Mercedes-Benz G-Class W465 G 580 EQ airbag control unit repair?

The part number is printed on the label of the control unit and determines the exact version. Within a model series there are different numbers depending on equipment and year of manufacture, so you should read off your number before sending the unit in.

We currently have no list of known part numbers for this vehicle. Simply read the number from the label of your control unit and enter it in the repair order. Whether the unit is defective is only shown by reading out the fault memory or by testing it at our workshop.

First have the fault memory read out. Then disconnect the battery, remove the control unit, create a repair order online and send the unit in. Processing at Airbag24, including testing, repairing and checking, usually takes 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.