Code Definition

B1609 — Illuminated Entry Input Short Circuit To Battery

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

About B1609

B1609 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 B1609 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.

B1609 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 B1609 code indicates that the Body Control Module (BCM), which on many Ford applications is referred to as the Generic Electronic Module (GEM), has detected a short to battery voltage on the illuminated entry input circuit. The illuminated entry input is the signal line the module monitors to know when to switch on the interior courtesy and dome lamps, and it is fed by the door ajar switches, the courtesy lamp control, and on most models the remote keyless entry receiver. With a short to battery present, the input is held at approximately 12V regardless of switch position, so the module se...

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