Ford Escape 2 airbag control unit repair

What is a Ford Escape 2 airbag control unit?

In the Ford Escape 2, the airbag control unit is the central unit of the restraint system (SRS). It reads the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners fire. During normal operation it checks itself and the entire system and indicates faults via the airbag warning light.

The unit is installed in the Ford Escape 2 (2008 to 2012) and was supplied by Bosch. Its existence usually goes unnoticed until the warning light in the instrument cluster comes on.

In an accident it stores crash data and locks itself. The light then stays on, and the restraint system reports in the fault memory.

Why is the Ford Escape 2 airbag control unit defective?

Most often the cause is crash data left in the Ford Escape 2 airbag control unit by an accident, even if no airbag fired. Other possible causes are aged electronic components, cold solder joints, corrosion from moisture at connectors, and voltage spikes.

Even if no airbags were deployed, the crash data remains stored in the unit. An ordinary diagnostic tool cannot remove it, so simply resetting the fault memory does not help in this situation.

Regardless of any accident, electronics age: components wear, solder joints crack, and moisture causes corrosion at connectors. Voltage spikes, for example with a weak battery or when jump-starting, put additional stress on the circuit.

How you can tell: the airbag warning light stays on permanently, the fault memory cannot be reset, or the diagnostic tool cannot make contact with the control unit.

Common error codes for Ford Escape 2 airbag control unit repair

Depending on the code, the error codes of the Ford Escape 2 airbag control unit relate to communication in the vehicle, the control unit itself, the squib circuits of the airbags or stored crash data. They can be found in the fault memory, which a diagnostic tool reads out.

A code can therefore originate in different parts of the system: in data exchange with other units, in the electronics inside the control unit, in a squib circuit leading to an airbag module, or in the crash memory. These codes are known for the unit:

• B1193 → Crash data stored in the control unit
• B0020 → General fault in the airbag control unit
• 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 control unit lost
• B0001 → Driver front airbag first stage, squib circuit interrupted
• B0002 → Driver front airbag second stage, squib circuit interrupted

The way to clarify this is the diagnostic tool, which reads the fault memory. However, a single code does not yet prove a defect in the control unit, as wiring, connectors or an airbag module can equally be the cause. Only an inspection of the unit gives certainty.

What part numbers are available for the Ford Escape 2 airbag control unit repair?

On the label of the Ford Escape 2 airbag control unit you will find the part number, which determines the exact version. Depending on equipment and year of manufacture, the numbers differ within the model series.

We know these numbers; the list is not complete:

• 8L84-14B321-AG
• 8L84-14B321-AH
• 8L84-14B321-AJ
• 8L84-14B321-AK
• 9L84-14B321-AJ
• 9L84-14B321-AK
• 9L84-14B321-AL
• AL84-14B321-AB
• BL84-14B321-AA
• BL84-14B321-AB

Compare the number of your unit with this list. This only tells you whether it is the right unit; whether there is a defect is only shown by reading out the fault memory or by an inspection.

The route to repair: first have the fault memory read out, then disconnect the battery and remove the control unit. Next, create a repair order online and send in the unit. At Airbag24, checking, repairing and testing usually take 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.