Code Definition

B0158 (07) — Left Front Seat Belt Buckle Switch Circuit Short to Earth

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Holden

About B0158

B0158 is a generic (obd-ii standard) body diagnostic trouble code recorded for Holden vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B0158 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

Because B0158 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Sensing and Diagnostic Module (SDM) and/or Body Control Module (BCM) monitors the left front seat belt buckle switch circuit to determine buckle status based on expected voltage or resistance changes. DTC B0158:07 is set when the control module detects the buckle switch signal circuit is shorted to earth, causing the input voltage to remain lower than the calibrated threshold regardless of actual buckle position. This prevents accurate detection of seat belt usage and may affect SRS logic and seat belt warning operation.

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