Code Definition

B1690 — Autolamp Delay Circuit Open

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

About B1690

B1690 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 B1690 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.

B1690 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 B1690 code indicates that the Body Control Module (BCM) or Light Control Module has detected an open circuit condition in the autolamp delay circuit, which is part of the automatic headlamp comfort system that keeps the headlights illuminated for a driver selected period after the ignition is switched off. The BCM monitors the signal voltage from the dash mounted autolamp delay control and sets this code when no return signal is seen on the circuit, indicating an open at the switch, in the harness, or at the BCM input pin. The autolamp delay control is typically a multi position rotary swi...

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