Code Definition

B1814 — Wiper Rear Motor Down Relay Coil Circuit Failure

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

About B1814

B1814 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 B1814 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.

B1814 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) monitors the rear wiper motor down relay coil control circuit on Ford vehicles equipped with a rear wiper system. DTC B1814 is set when the BCM detects an electrical fault on the down relay coil drive line, typically an open circuit, short to ground, or short to battery voltage. The down relay is the device that energises the rear wiper motor to return the blade to its parked (down) position at the end of a wipe cycle, and the BCM commands the relay coil by pulling the control line to ground. When this code is set, the rear wiper may fail to park correctly, may st...

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