Code Definition

B1604 — Lamp Anti-Theft Indicator Circuit Open

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

About B1604

B1604 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 B1604 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.

B1604 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 or Instrument Cluster on Ford vehicles equipped with the Passive Anti-Theft System (PATS) monitors the anti-theft indicator lamp circuit and reports an open circuit fault as DTC B1604. This code specifically indicates that no current is flowing through the indicator lamp circuit when the controlling module commands the lamp on, meaning the circuit is interrupted somewhere between the module driver, the bulb itself, and its corresponding ground or power return. The PATS indicator is the small key or padlock symbol on the dashboard that should illuminate during prove out ...

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

Quick Facts