Code Definition

B1510 — Flash To Pass Switch Circuit Short To Ground

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

About B1510

B1510 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 B1510 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.

B1510 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 headlamp control module monitors the flash to pass switch input from the multifunction stalk and expects the input to sit at a defined idle voltage when the switch is open. DTC B1510 sets when the module sees the input wire pulled to chassis ground continuously, indicating a short to ground somewhere along the input circuit. Depending on whether the input is configured as switched ground or switched supply, this short may be interpreted as either a permanent switch press (causing high beams to flash continuously) or a circuit fault that locks out the flash to p...

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