Ford Explorer 3 U152 airbag control unit repair

What is a Ford Explorer 3 U152 airbag control unit?

The Ford Explorer 3 U152 airbag control unit is the central control unit of the restraint system (SRS). It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners deploy. After an accident it stores crash data and locks itself.

The control unit is fitted in the Ford Explorer 3 U152 (2002 to 2005). It works in the background and is checked every time the vehicle is started.

Besides evaluating the sensors, the control unit continuously monitors the entire restraint system. If it detects a fault, it reports it via the airbag warning light and stores it in the fault memory. For Ford the same principle applies as for other vehicle manufacturers: without a working control unit, the restraint system is not ready for use.

Why is the Ford Explorer 3 U152 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.

Crash data cannot be erased with an ordinary diagnostic tool. The control unit therefore stays locked, and the airbag warning light does not go out, even if all components of the system are fine.

Electronic components age over the years, and solder joints can become brittle through temperature changes and vibration. Moisture leads to corrosion on connectors. Voltage spikes arise, for example, from a weak battery or from jump-starting and can damage the electronics.

Typical signs are a permanently lit airbag warning light, a fault memory that cannot be cleared, or a diagnostic tool that cannot establish a connection to the control unit.

Common error codes for Ford Explorer 3 U152 airbag control unit repair

You read out error codes from the fault memory with a diagnostic tool. They show in which area of the restraint system a fault lies, for example in communication, in the control unit itself, in the squib circuits or in the crash data.

Reading out comes first: the diagnostic tool is connected to the vehicle's diagnostic interface, and the fault memory of the restraint system is queried. The code then lets you classify what is being reported. For Ford Explorer 3 U152, these codes occur, among others:

• B1342 → Internal fault in the airbag control unit
• U2017 → Memory fault in the restraint system control unit
• B1231 → Crash event memory full, accident data stored
• U0151 → Communication with the restraint system control unit lost
• B0001 → Driver front airbag, first stage, squib circuit interrupted
• B0002 → Driver front airbag, second stage, squib circuit interrupted
• B0010 → Passenger front airbag, first stage, squib circuit interrupted
• B0011 → Passenger front airbag, second stage, squib circuit interrupted

A code alone does not prove that the control unit is defective. Connectors, wiring or an airbag module can also be the cause. Only the inspection clarifies it. Please enclose the printout of the read-out with the unit you send in.

What part numbers are available for the Ford Explorer 3 U152 airbag control unit repair?

The part number is printed on the label of the control unit. It determines the exact version, because within a model series there are different numbers depending on equipment and year of manufacture.

These part numbers are known for Ford Explorer 3 U152:

• 1L2A-14B321-AM

Compare the number on your unit with this list. This only ensures that it is the right unit. Whether it is defective is shown only by reading out the fault memory or by the inspection.

This is how you get to the repair: have the fault memory read out, disconnect the battery and remove the control unit. Then create a repair order online and send in the unit. Processing at Airbag24 usually takes 3–4 working days. 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.