Airbag control unit with part number 1503001853

What is the function of the airbag control unit 1503001853?

The airbag control unit 1503001853 from DENSO is the central control module for the passive safety system (SRS) in the Lexus RX III (AL10). It continuously monitors the sensors, processes their data, and ensures that, in the event of a crash, the airbags and seatbelt pretensioners are deployed with precision.

As the heart of the Supplemental Restraint System (SRS), this control unit processes signals from acceleration and pressure sensors. Based on this information, it determines within milliseconds whether deployment of the restraint systems is necessary to provide optimal protection for occupants.

The proper functioning of this device is critical for safety. Any internal fault or communication error immediately triggers the airbag warning light, alerting the driver to a potential system malfunction.

Why does the control unit 1503001853 fail?

A common reason for repairing the control unit 1503001853 is the storage of crash data after an accident. Other causes include internal electronic faults, communication issues via the CAN bus, or physical damage caused by water ingress and short circuits. Defective wiring or connectors can also impair functionality.

Following a collision in which the airbags have deployed, the control unit permanently stores crash data. This lockout feature ensures safety by preventing further operation until the unit has been professionally inspected and reset. An electronic repair can erase this data and restore full functionality.

Electronic components inside may fail over time, often resulting in non‑erasable diagnostic trouble codes (DTCs such as U1XXX or B1XXX) or complete loss of communication with the diagnostic system. Damage to connectors due to corrosion or mechanical stress is another typical source of failure.

For the Lexus RX AL10, the alternative part number 8917048380 is also well known; it comes from DENSO and may exhibit technically comparable defects.

How do you recognize a defect in the 1503001853?

The most obvious symptom of a defect is a constantly illuminated or flashing airbag warning light (SRS warning light) in the instrument cluster. Often, specific fault codes in the fault memory cannot be cleared, or the diagnostic tool cannot establish communication with the control unit.

An active SRS warning light is a clear indication that the airbag system is not functioning properly. This could mean the airbags will fail to deploy in a crash, posing a significant safety risk. The vehicle should be inspected immediately at a workshop.

Another sign is when the control unit becomes unreachable through the diagnostic interface. Error messages such as “No communication with the control unit” or specific CAN‑bus errors point to a serious internal fault.

In which models is the control unit 1503001853 installed?

At Airbag24, we repair the DENSO control unit 1503001853, as well as its equivalent variant 8917048380, for various model series of the Lexus RX. Our repairs cover both pre‑ and post‑facelift third-generation (AL10) vehicles, providing a cost‑effective alternative to expensive new parts for these models.

The control unit with part number 1503001853 is specifically designed for the following vehicle models:

Lexus: RX AL10 (2009–2012) and RX AL10 Facelift (2012–2015)

How does the repair process work at Airbag24?

After sending your removed control unit to Airbag24, our technicians perform a precise diagnosis. The repair includes erasing crash data and replacing defective electronic components. The unit is then thoroughly tested to ensure full functionality. We offer 2 years' statutory liability for defects on every repair.

The process begins with the professional removal of the control unit from the vehicle. Please ship the defective part securely packaged to us. A preliminary diagnosis at a workshop helps rule out other potential sources of failure, such as damaged cables or sensors.

At Airbag24, the unit is first analyzed on state-of-the-art test benches to pinpoint the exact fault. Depending on the issue, stored crash data is erased, or faulty components on the circuit board are replaced with new, high‑quality parts. Final tests confirm that the control unit functions perfectly once again.

Following repair, the control unit is typically ready for immediate reinstallation and performs just like a brand‑new component. You receive a fully functional part that restores safety to your vehicle.