Maybach 57 W240 Saloon airbag control unit repair

What is a Maybach 57 W240 Saloon airbag control unit?

The airbag control unit is the central control unit of the restraint system (SRS) in the Maybach 57 W240 Saloon. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners deploy. It also monitors the system continuously and reports faults via the airbag warning light.

The control unit is installed in the Maybach 57 W240 Saloon (2002 to 2012). In everyday use you only notice it when something is wrong: the airbag warning light comes on and there are entries in the fault memory.

After an accident, the control unit stores crash data and locks itself.

Why is the Maybach 57 W240 Saloon airbag control unit defective?

The most common cause is crash data stored after an accident, even if no airbag deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes, for example from a weak battery or jump-starting.

Stored crash data cannot be deleted with an ordinary diagnostic tool.

Typical signs are a permanently lit airbag warning light, a fault memory that cannot be cleared, and a diagnostic tool that cannot connect.

Common error codes for Maybach 57 W240 Saloon airbag control unit repair

The error codes for the Maybach 57 W240 Saloon airbag control unit mainly indicate internal control unit faults, as well as disturbed communication over the data bus and problems in the control unit's power supply.

Reading comes first: connect a diagnostic tool and have the fault memory of the restraint system read out. Only then interpret the codes. These codes occur on this model; the list is not complete.

• 9000 → Internal fault of the restraint system control unit
• 9001 → Internal fault in the control unit
• 9076 → CAN bus communication disturbed
• 9002 → Control unit power supply disturbed

A code alone does not prove that the control unit is defective. Connectors, wiring or an airbag module can also be the cause. Only an inspection will clarify it.

What part numbers are available for the Maybach 57 W240 Saloon airbag control unit repair?

The part number is on the label of the airbag control unit in the Maybach 57 W240 Saloon. It determines the exact version of the unit and is stated in the repair order. Within a model series there are different numbers depending on equipment and year of manufacture.

For this model we cannot list any known part numbers here. Please read the number directly from the label of your removed unit and enter it when you create the repair order. The number only ensures that we have the right unit in front of us. Whether it is defective is shown only by reading out the fault memory or by our inspection.

The route to repair is short: first have the fault memory read out. Then disconnect the battery and remove the control unit. Create a repair order online and send in the unit. Processing at Airbag24 usually takes 3–4 working days and covers inspection, repair and testing. Please enclose the read-out report with the unit. 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.