Code Definition

B1166 — Curtain Shield Squib LH Circuit Malfunction

System: Body  |  Type: Manufacturer-Specific  |  Make: Nissan

About B1166

B1166 is a manufacturer-specific body diagnostic trouble code recorded for Nissan vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1166 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1166 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Supplemental Restraint System (SRS) Control Module continuously monitors the left hand curtain shield airbag squib circuit for correct continuity, resistance, and voltage integrity. The squib is the electric initiator that fires the curtain airbag in a side impact or rollover event, and the SRS module expects a tightly controlled resistance (typically in the 2 to 5 ohm range on Nissan) with no applied voltage when the circuit is dormant. DTC B1166 is logged when the SRS module detects any electrical malfunction on the LH curtain squib line, including open circuit, short to ground, short to...

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