Code Definition

B1793 — Autolamp Sensor Input Circuit Short To Ground

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

About B1793

B1793 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 B1793 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

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.

B1793 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) monitors the autolamp sensor input circuit so the exterior lighting can be controlled automatically based on ambient light. The autolamp sensor is a photocell typically mounted on top of the dashboard under a translucent dome that returns a low voltage signal to the BCM that varies with light level. DTC B1793 is set when the BCM detects that the autolamp sensor input has been shorted to ground, meaning the signal voltage is pulled to or near 0V regardless of light conditions. When this code is set, the autolamp feature will not operate correctly, the BCM may inter...

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