Airbag control unit with part number 01-01724-00

What is the function of Airbag Control Unit 10172400?

The airbag control unit with part number 10172400, also known by Land Rover original numbers AMR4905 and AWR4905, is the central control unit for the passive safety system in the Land Rover Range Rover P38A. It processes sensor data to deploy airbags and seatbelt pretensioners in the event of a crash and stores relevant crash data.

This control unit is designed exclusively for the Range Rover P38A (model years 1994–2002). Its primary task is to monitor and analyze signals from the crash sensors distributed throughout the vehicle.

If the system detects a collision, the unit sends ignition pulses to the corresponding airbags and pyrotechnic seatbelt pretensioners. At the same time, crash data is recorded in the unit’s internal memory, which necessitates repair or reset after an accident.

Why does control unit 10172400 fail?

The most common cause of failure for control unit 10172400 is the storage of crash data following an accident, resulting in system lockout. Other reasons include internal electronic component defects caused by aging or moisture ingress, leading to communication errors.

After an accident—even minor collisions such as rear-end impacts—crash data remains permanently stored in the control unit’s memory. This causes the airbag warning light to illuminate and the system to deactivate for safety reasons. Such data must be professionally erased.

Another typical source of failure is hardware defects on the circuit board. Electronic components can degrade over time or become damaged by environmental factors like moisture, leading to internal malfunctions such as error code B1000 (control unit defective).

How do you recognize a faulty airbag control unit 10172400?

A defect in control unit 10172400 primarily manifests as a continuously illuminated airbag warning light on the instrument cluster. Often, communication with a diagnostic tool is no longer possible, or specific error codes like B1000 or other fault messages appear on the display.

The clearest indication is the airbag warning light that fails to turn off after engine start-up or flashes sporadically during driving. This signals a fault in the restraint system that should be inspected immediately.

Often, a workshop using its diagnostic equipment cannot establish communication with the airbag control unit. The unit does not respond to queries, preventing accurate fault analysis and strongly suggesting an internal defect.

The fault memory may contain specific codes such as B1000 (“control unit defective”) or errors in the 018xxx range. Sometimes misleading messages appear on the display, such as “fuel shut-off valve defective” or claims that the airbags are faulty, even though the root cause lies within the control unit.

In which vehicles is control unit 10172400 installed?

The airbag control unit with part number 10172400 and alternative numbers AMR4905 and AWR4905 was specifically developed for the second-generation Land Rover Range Rover (P38A) and is not compatible with other Land Rover or Range Rover models.

At Airbag24, we repair this control unit for the entire Range Rover P38A series, covering both original models and facelift versions.

Specifically, this control unit is found in the following models:

Land Rover Range Rover P38A (model years 1994–1998)

Land Rover Range Rover P38A Facelift (model years 1998–2002)

How is repair of control unit 10172400 carried out?

Repair begins with a comprehensive diagnosis of the submitted control unit to determine the exact cause of the fault. Defective electronic components are then replaced, the circuit board is refurbished, and stored crash data is erased. A final functional test ensures quality, backed by 2 years' statutory liability for defects.

Before removing the control unit, a specialized workshop should read out the fault memory and provide a test report confirming that the issue originates from the control unit itself rather than another component of the airbag system.

Upon receipt at Airbag24, our technicians perform a detailed incoming inspection, connecting the unit to specialized test systems to precisely locate the fault—whether it’s a hardware defect or locked crash data.

The actual repair involves replacing defective components, professionally refurbishing the circuit board, and reprogramming the memory to completely erase all crash data. Finally, the control unit is thoroughly tested for full functionality, ensuring it operates like new after installation.