Code Definition

B1115 — High-Mount Stop Light Control Circuit

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

About B1115

B1115 is a manufacturer-specific body diagnostic trouble code recorded for Mazda vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1115 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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.

B1115 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) energises and monitors the high mount (centre) stop lamp circuit to verify proper lamp operation when the brake pedal is applied. The BCM typically uses a smart driver with integrated current sensing, allowing it to detect open circuits, short circuits, and abnormal current draw as well as basic lamp failure. DTC B1115 is logged when the BCM detects an abnormal feedback signal on the high mount stop light control circuit, such as an open circuit, short to ground, short to battery voltage, or excessive current, for longer than the defined threshold (typically 0.5 s...

Join TaT to view the complete code information and diagnostic details.

Quick Facts