Code Definition

B1587 — Autolamp Delay Increase Circuit Failure

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

About B1587

B1587 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 B1587 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.

B1587 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 continuously monitors the autolamp delay potentiometer or rheostat used to set how long the headlamps remain on after the ignition is switched off. DTC B1587 sets when the BCM detects a generic circuit failure on the autolamp delay increase input that does not match a specific open, short to battery, or short to ground pattern. The autolamp delay function relies on a variable resistance or PWM signal from the dash mounted control to communicate the driver selected delay time. When this code i...

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