Code Definition

B1312 — Lamp Headlamp Input Circuit Short To Battery

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

About B1312

B1312 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1312 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.

B1312 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 Body Control Module (BCM) or Lighting Control Module reads the position of the headlamp switch through a set of input lines that the switch pulls to ground when its various positions, such as park, low beam, and high beam, are selected. Each input line is held high through an internal pull up reference voltage in the controlling module, and the module interprets a transition from high to low as the corresponding switch position being chosen. DTC B1312 sets when the controlling module detects battery voltage on a headlamp input line when only ground or the pull up reference should ever be p...

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