Lamborghini Murciélago Roadster airbag control unit repair

What is a Lamborghini Murciélago Roadster airbag control unit?

The airbag control unit controls the restraint system (SRS) in the Lamborghini Murciélago Roadster. It reads out the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners deploy. At the same time it monitors the system continuously and indicates faults with the airbag warning light.

In the Lamborghini Murciélago Roadster (2004 to 2006), the unit is the central control unit for sensors, squib circuits and airbag modules. It evaluates every measurement immediately. Deployment follows the severity of the impact. Every millisecond counts here, so the electronics must work flawlessly. If part of the chain fails, the unit notices during its self-test and reports it.

When the ignition is switched on, the unit tests itself. If it finds a fault, the warning light stays on. After an accident it stores crash data and locks itself.

Why is the Lamborghini Murciélago Roadster airbag control unit defective?

Most often the cause is crash data stored after an accident, even if no airbag deployed. An ordinary diagnostic tool does not delete it. Ageing components, cold solder joints, corrosion on the connectors and voltage spikes are also possible causes.

Over time, moisture attacks the contacts of the plug connections. Solder joints become brittle and components lose performance. A weak battery or jump-starting produces voltage spikes that put stress on the electronics in the Lamborghini unit.

Many things point to a defect: the airbag warning light stays on continuously. The fault memory cannot be cleared. The diagnostic tool cannot establish a connection. In that case the control unit should be checked. This also applies if the car otherwise drives normally, because the fault affects only the restraint system. In an accident the airbags might then not deploy as intended.

Common error codes for Lamborghini Murciélago Roadster airbag control unit repair

The codes on the Lamborghini Murciélago Roadster report internal faults of the control unit, stored crash data or faults in the squib circuits. Some are output by the warning light as a flash code. Which code appears depends on the particular defect.

These codes are known for this model:

• 01 → Internal control unit fault, output as flash code
• B1139 → Internal fault in the SRS control unit
• B1649 → Crash detected and stored in the control unit
• B1650 → Crash detected and stored in the control unit
• 05 → Squib circuit seatbelt pretensioner driver side or front passenger airbag
• 15 → Internal fault in the airbag control unit

A diagnostic tool reads the codes from the fault memory. A single code does not yet prove a defect in the control unit. Connectors, wiring or an airbag module may also be the cause. Only the inspection shows where the fault lies.

What part numbers are available for the Lamborghini Murciélago Roadster airbag control unit repair?

You will find the part number on the label of the control unit. It determines the exact version. Depending on equipment and year of manufacture, the numbers differ within a model series.

Here are the known numbers for the Lamborghini Murciélago Roadster:

• 410959655

Compare the number of your unit with this list. This only ensures that you have the right unit in front of you. Whether it is defective is clarified only by reading out the fault memory or by the inspection.

The route to repair is short. Have the fault memory read out. Disconnect the battery and remove the control unit. Create a repair order online and send in the unit. Testing, repairing and checking usually take 3–4 working days at Airbag24.

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.