Code Definition

B1693 — Autolamp On Circuit Failure

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

About B1693

B1693 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 B1693 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.

B1693 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 B1693 code indicates a failure in the Autolamp On circuit, which is the input circuit that tells the Body Control Module (BCM) when ambient light has fallen below the threshold for automatic headlamp activation. The system relies on a photocell mounted on the dash top or windshield base that varies its resistance with light intensity, and the BCM evaluates that signal to decide when to switch the headlights on automatically. The code is set when the BCM sees a signal value outside the expected range or fails to receive a valid signal at all, which prevents the autolamp feature from operati...

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