930B

What the Code Means

930B logs a fault in the Battery Safety Terminal (BST), the pyrotechnic fuse on the battery terminal. In a collision, the SRS module fires the BST pyrotechnic charge, which physically breaks the circuit between the battery and the vehicle electrical system, lowering the risk of fire from shorted wiring.

The code can be set by a BST that deployed in a crash, damaged wiring, or faulty connectors in the pyrotechnic firing circuit.

Symptoms

• The airbag (SRS) warning light is on.
• The battery may be disconnected from the electrical system.
• Erratic behavior from the vehicle's electrical system.

Diagnosis and Repair

1. Inspect the BST itself and the wiring of the pyrotechnic firing circuit: check the connectors for integrity, damage, and contact corrosion.
2. If the BST has deployed (the pyrotechnic charge is spent), the unit must be replaced; rebuilding deployed BST terminals is handled by specialist shops that repair SRS components.
3. After the fault is fixed, clear the codes and reset the SRS system.

Related Problems

• With a faulty BST, the battery may not disconnect in a crash, which raises the fire risk.
• The vehicle's electrical systems may behave erratically.

Severity is critical: the fault directly affects crash safety, and putting off the repair is not acceptable.