Code Definition

B1694 — Autolamp On Circuit Open

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

About B1694

B1694 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 B1694 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.

B1694 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 B1694 code is set when the Body Control Module (BCM) detects an open circuit on the Autolamp On input, which is the photocell signal that drives automatic headlamp switching based on ambient light. Under normal operation the BCM provides a low voltage reference to the photocell and reads the return signal as it varies with light intensity. When the BCM sees no signal at all on this circuit it concludes there is an open between the photocell and the module, in the photocell connector, or within the photocell itself. With this code active the autolamp on function is disabled, so the headligh...

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