Code Definition

B1240 — Wiper Washer Rear Pump Relay Circuit Failure

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

About B1240

B1240 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 B1240 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.

B1240 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

On vehicles equipped with a rear washer, the body control module or dedicated wiper control module commands the rear washer pump through an internal relay, an external relay, or a solid state driver, depending on vehicle design. The module monitors the coil drive circuit for correct voltage and current feedback so it can confirm the relay energises and releases as expected. DTC B1240 is set when the module detects an electrical fault on this circuit, such as an open relay coil, a shorted coil winding, a short to ground or battery voltage on the control wire, or a failed internal driver transis...

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