Code Definition

B1459 — Wiper Washer Pump Motor Relay Coil Circuit Open

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

About B1459

B1459 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1459 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.

B1459 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 wiper washer pump motor relay coil is the low current electromagnet inside the relay that closes the high current contacts when energised. The Body Control Module (BCM) drives one side of the coil through a low side or high side driver while the other coil pin connects to a permanent battery feed or chassis ground depending on architecture, and the BCM monitors the coil control circuit for open conditions during command transitions. DTC B1459 is set when the BCM detects no current flow or no expected voltage transition on the coil control circuit when the relay is commanded on, indicating ...

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