Code Definition

B1589 — Autolamp Delay Increase Circuit Short To Battery

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

About B1589

B1589 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 B1589 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1589 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 increase signal wire from the headlamp switch potentiometer used to set how long the headlamps remain on after key off. DTC B1589 sets when the BCM detects that the autolamp delay increase circuit is shorted to battery voltage, meaning the input is being pulled high outside its normal operating range. This typically results from a chafed wire contacting a B+ feed in the same harness bundle, an internal switch failure, or moisture bridging at the headlamp switch con...

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