Code Definition

B1819 — Wiper Rear Motor Up Relay Coil Circuit Open

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

About B1819

B1819 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 B1819 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.

B1819 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 up relay coil control circuit on Ford vehicles equipped with a rear wiper system. DTC B1819 is set specifically when the BCM detects an open circuit on the up relay coil drive line, meaning either the coil itself is internally open or the wiring between the BCM driver and the relay coil has lost continuity. The up relay energises the rear wiper motor to drive the blade across the glass during a wipe stroke, and the BCM verifies the integrity of the coil circuit by sensing current flow when the relay is commanded. When this code is set...

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