Airbag control unit with part number MT15RD5

What is the function of the MT15RD5 airbag control unit?

The MT15RD5 airbag control unit is the central control module for the occupant protection system, particularly in first-generation Chrysler Intrepid and Dodge Intrepid LH models. It analyzes data from crash sensors, determines whether to deploy the airbags, and communicates with the vehicle’s network.

As a core module of the Supplemental Restraint System (SRS), the MT15RD5 monitors all safety‑related components. It continuously receives signals from acceleration sensors distributed throughout the vehicle. In the event of a collision exceeding a predefined deceleration threshold, the control unit makes the decision to deploy the airbags within milliseconds.

It then sends the necessary ignition pulses to the corresponding airbag igniters and seatbelt pretensioners. At the same time, it transmits system status information—such as a fault or an activation—to the instrument cluster, indicated by the airbag warning light.

Why does the MT15RD5 airbag control unit fail?

The most common cause of MT15RD5 failure is stored crash data following an accident, which locks the unit out of service. Other causes include electronic faults due to voltage spikes in the vehicle’s electrical system, corrosion from moisture, or mechanical damage to solder joints caused by vibrations.

A primary reason is the storage of crash data. Once the control unit registers a collision and deploys the airbags—or even just barely reaches the deployment threshold—it permanently writes this information into its internal memory (EEPROM/Flash). Many systems then block further operation for safety reasons until the module is properly reset or replaced.

Voltage and overvoltage damage are also frequent sources of failure. Issues with the battery, charging system, or jump-starting can lead to voltage fluctuations that harm sensitive components such as voltage regulators, protective diodes, or processors on the circuit board. This often results in internal malfunctions and complete communication failure.

Since the control unit is typically installed inside the vehicle cabin—often in the center console or beneath the seats—it is susceptible to moisture. Water ingress, condensation, or spilled liquids can cause corrosion on connector pins and traces, leading to contact problems and short circuits.

Mechanical stress and improper handling also play a role. Over years of vibration, hairline cracks may develop at solder joints (cold solder joints). Similarly, electrostatic discharge (ESD) during removal or handling without proper precautions can irreparably damage the semiconductors inside the control unit.

How do you recognize a defective MT15RD5 control unit?

A defect in the MT15RD5 almost always manifests as a persistently illuminated airbag warning light on the dashboard. Additional clear indicators include error codes stored in the diagnostic memory, such as “crash data stored” or “internal error,” along with a complete inability to communicate with a diagnostic tool.

The most obvious symptom is the constantly lit airbag warning light. It does not turn off after starting the vehicle, signaling a serious malfunction in the restraint system that requires immediate inspection.

During a workshop diagnosis, specific fault codes can be read. Common entries point to an internal fault in the control unit—roughly comparable to the well-known VAG error code 65535 (“control unit defective”). Faults related to power supply or stored crash data are also displayed.

In many cases, communication is no longer possible. The diagnostic tool cannot establish a connection with the airbag control unit, complicating troubleshooting and often indicating a direct defect in the ECU itself. Such a condition poses a significant safety risk, as the entire airbag system may become inoperable in an emergency.

In which models is the MT15RD5 airbag control unit installed?

The MT15RD5 control unit is specifically designed for vehicles based on Chrysler’s LH platform from the 1990s. At Airbag24, we accept this module for first‑generation Chrysler Intrepid and the identical Dodge Intrepid LH models for professional repair.

At Airbag24, we repair the MT15RD5 control unit for the following models:

First‑generation Chrysler Intrepid (circa 1992–1997)

Dodge Intrepid LH

How is the MT15RD5 professionally repaired?

Professional repair at Airbag24 includes an initial analysis, targeted elimination of the root cause—whether clearing crash data or replacing faulty hardware—and a final functional test on the test bench. This process restores full functionality and is backed by a 12‑month warranty.

Before removal, perform a vehicle diagnosis and attach the fault log to the control unit. The removal itself must be carried out with the power disconnected: disconnect the vehicle battery (first the negative terminal, then the positive) and wait at least 10 minutes to allow all capacitors to discharge. Also, observe ESD protection measures to prevent damage from static discharge.

After being sent to Airbag24, the control unit undergoes a standardized process. First, a visual and electrical input inspection is performed. Depending on the fault pattern, the internal memory is then read out to erase crash data and restore the device to its factory settings.

If a hardware defect is detected, faulty components such as voltage regulators, driver ICs, or communication transceivers are replaced with new, high-quality parts. Cold solder joints on connectors or large components are also professionally resoldered.

Finally, the repaired control unit is tested on a specialized test bench. All ignition circuits are simulated using test loads (resistance dummies) to ensure proper functionality. Following a successful test, the unit is prepared for return shipment. We provide a 12-month warranty on every repair.

What shipping options does Airbag24 offer?

Airbag24 provides convenient shipping solutions. You can send your control unit yourself free of charge, or arrange a paid UPS pickup at your preferred location. Return shipping is standardly free via UPS Standard, or optionally via Express, including cash-on-delivery. Personal pickup is also available.

For outbound shipping, you have two options: either pack the control unit securely and send it to us yourself, or use the convenient UPS pickup service, which you can book directly when placing your order.

For return shipping, several options are available to suit your needs:

Free UPS Standard shipping (1–3 business days)

UPS Express shipping (1–2 business days)

UPS Standard shipping with cash-on-delivery (1–3 business days)

UPS Express shipping with cash-on-delivery (1–2 business days)

Personal pickup directly at our premises