Code Definition

B1439 — Wiper Mode Select Switch Circuit Open

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

About B1439

B1439 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 B1439 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.

B1439 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 monitors the wiper mode select switch input and sets DTC B1439 when it detects an open circuit on the switch input wiring or within the switch itself, meaning no valid current path can be established for the BCM to read switch position. The wiper mode select switch is typically a multi position resistor ladder or discrete switched ground network mounted on the steering column or in the instrument cluster. With the circuit open, the BCM reads only the high reference voltage with no pull down for any switch position and cannot determine which mode the driver has selected....

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