0X930C1F: Unexpected Firing Circuit Detected

Stored crash data

What 0X930C1F means

Every deployment is supposed to follow a decision the module made. This code covers the case where the module detects that a squib has fired outside that decision. The circuit that carried the charge now reads like a fired device, and the module logs the discrepancy because an uncommanded deployment is a serious condition for a safety system.

In practice this usually traces back to something that put energy on a firing loop directly. Working on a live restraint system without disconnecting the battery and waiting out the reserve power is the most common way it happens. A short that connects a firing circuit to battery voltage can do the same thing, which is why short to positive faults on firing loops are treated so seriously.

Common causes

• A restraint component handled or disconnected with the system still powered
• A firing circuit shorted to battery voltage by damaged or aftermarket wiring
• Testing a squib circuit with a meter that sourced enough current to fire it
• Improper jump starting or welding on the vehicle with the module connected
• A deployment that occurred during salvage handling or transport
• A module installed while the vehicle harness was energized

Crash data or hardware fault?

BMW files this with crash data, and it behaves that way. The entry is a record of something that already happened inside the module, not a reading it keeps taking, so it stays in memory after the fact. Live circuit codes work differently. They report present conditions and stop being reported the moment the conditions are corrected.

Does our reset clear it?

Our mail-in reset clears this stored record, and it belongs at the end of the job rather than the beginning. Any device that fired has to be replaced, because a squib is single use and a fired airbag or tensioner cannot be reused. Repair the wiring that allowed the unexpected firing, install the new components, then send us the ACSM and we clear the module so the system will arm again.

Which makes throw it

0X930C1F is read on BMW vehicles through BMW hex diagnostics. The concept of an uncommanded firing record exists across manufacturers, but this code number belongs to BMW.

What to do next

Find out which circuit fired before you order anything, since replacing the wrong device leaves the module reporting the same thing. Inspect the vehicle for aftermarket wiring and for evidence that somebody worked on the system with power connected. Replace the fired component with a genuine OEM part, correct the wiring, then mail the module to us for the reset. Related codes: 0X930AB7, 930B, EX-11.