Code Definition

B1315 — Battery Saver Relay Coil Circuit Short To Battery

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

About B1315

B1315 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1315 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.

B1315 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), Generic Electronic Module (GEM), or equivalent module controls the battery saver relay coil through a low side driver to power down accessory loads such as interior courtesy lamps and dome lamps after a programmed time delay, preventing battery drain when the vehicle is left switched off. DTC B1315 is set specifically when the controlling module detects a short to battery voltage on the relay coil drive line, meaning battery voltage is present on the circuit at a time when the module is not commanding it to be high. With the line continuously held at battery volt...

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