Code Definition

B1684 — Mirror Driver/Passenger Switch Circuit Open

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

About B1684

B1684 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 B1684 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.

B1684 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

B1684 is a Ford specific code indicating an open circuit condition in the driver or passenger door mirror selector switch input to the Body Control Module (BCM). The mirror selector is a resistor ladder switch in the master door panel that should always present a defined resistance to the BCM analog input regardless of position. When the BCM detects no current flow on the input wire, it interprets the condition as an open circuit and stores this code. The mirrors will not respond to driver inputs because the BCM cannot determine which mirror has been selected, and the symptom is normally a com...

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