Code Definition

B1603 — Lamp Anti-Theft Indicator Circuit Failure

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

About B1603

B1603 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 B1603 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1603 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 Instrument Cluster on Ford vehicles equipped with the Passive Anti-Theft System (PATS) monitors the anti-theft indicator lamp circuit to confirm the bulb and wiring are operating correctly. DTC B1603 is set when the controlling module detects an electrical fault in the indicator lamp circuit, typically an open circuit, short to ground, or short to battery voltage. The anti-theft indicator is the small key or padlock symbol on the dashboard that flashes when the system is armed and gives the driver feedback about transponder key recognition. When this code is ac...

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