Code Definition

B1689 — Autolamp Delay Circuit Failure

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

About B1689

B1689 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 B1689 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.

B1689 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 B1689 code indicates a failure in the autolamp delay circuit, which is part of the automatic headlamp system that controls how long the headlights remain on after the ignition is switched off. The Body Control Module (BCM) or Light Control Module monitors this circuit and sets the code when the delay function does not perform within factory specifications, which can result from a circuit fault, an out of range delay timer signal, or an internal module fault. The autolamp delay is typically driven by a driver selectable timer or a rotary control on the dash that signals the BCM how long to ...

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