11-BX: Driver Second Inflator Ground Short

Circuit fault

What 11-BX means

The stage two loop on a dual-stage driver airbag is meant to float, isolated from the body of the car. The SRS unit watches both legs of the pair against ground. When one of them reads grounded, the module can no longer guarantee it controls that inflator, so it stores 11-BX and takes the system offline.

Nearly every case comes down to a wire touching metal somewhere between the SRS unit and the airbag. The steering column is full of brackets, the tilt mechanism, and the shaft itself, and any of those will ground a conductor that loses its insulation. Water sitting in a connector does the same job without any visible damage to the wire.

Common causes

• A column harness rubbed bare against the steering shaft or a mounting bracket
• Moisture in the airbag or cable reel connector giving the loop a path to the body
• A cable reel ribbon damaged where it exits the housing and contacting the reel frame
• A wire pinched under the lower column cover or a knee bolster during reassembly
• Corrosion at the SRS unit connector after water came in through a windshield or cowl leak

Crash data or hardware fault?

Because 11-BX tracks a live measurement, it reflects the state of the circuit at this moment. Repair the ground path and the reading returns to normal on the next self test. That is the opposite of stored crash data, which the module writes once after a deployment and holds regardless of what the wiring does afterward.

Does our reset clear it?

Wiping the code out with a scan tool does not lift the wire off ground. Until the contact point is repaired, the SRS unit finds the same condition and sets 11-BX again on the next key cycle. Do the electrical repair first. Our mail-in module reset applies to a different problem, which is a module locked on crash data after airbags have gone off.

Which makes throw it

Our Acura index carries 11-BX for this circuit. The Honda code list is organized separately, so check the code against the right index for the badge on the car before you follow a wiring diagram.

What to do next

Start with a visual pass through the steering column with the covers off, since a wire worn against the shaft or a bracket shows itself under a flashlight. Measure each leg of the stage two loop to chassis ground with the airbag disconnected, which separates the harness from the bag. If both legs read clean with the bag unplugged, the ground path is inside the airbag assembly and the bag is the part to replace. Related codes: 11-AX, 12-4X, B1C4E.