Code Definition

B1508 — Flash To Pass Switch Circuit Open

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

About B1508

B1508 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 B1508 is stored, the module has detected an open (broken or disconnected) electrical path 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.

B1508 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 on the steering column. The flash to pass function activates the high beam headlamps momentarily when the driver pulls the turn signal stalk toward themselves. DTC B1508 sets specifically when the module detects an open circuit on the flash to pass switch input, meaning the wire between the switch and the module has lost continuity or the switch itself can no longer make connection. When this code is active the driver typically loses flash to pass functionality entirely...

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