Code Definition

B1678 — Alarm Panic Input Circuit Open

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

About B1678

B1678 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 B1678 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.

B1678 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

B1678 indicates an open circuit on the alarm panic input signal to the Body Control Module (BCM) or anti theft control module. The panic input typically originates from the keyless entry receiver when the panic button on the key fob is pressed, or from a hardwired panic switch in the vehicle. The control module monitors this circuit continuously and sets this code when it detects an open condition between the panic input source and the module. When this code is set, the panic alarm function may not operate, the security system warning may illuminate, and the keyless entry remote may not trigge...

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