Code Definition

B1592 — Autolamp Delay Decrease Circuit Open

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

About B1592

B1592 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 B1592 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.

B1592 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) on Ford, Lincoln, and Mercury vehicles equipped with the Autolamp system monitors the autolamp delay decrease signal wire from the headlamp switch potentiometer used by the driver to shorten the headlamp delay time after key off. DTC B1592 sets when the BCM detects an open circuit on the autolamp delay decrease input, meaning continuity from the switch wiper through the resistor element back to the BCM is missing. Common causes include a broken decrease wire, a disconnected switch, or an open in the decrease side of the potentiometer. With this code present the au...

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