Code Definition

B1620 — Wiper Rear Low Limit Input Circuit Open

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

About B1620

B1620 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 B1620 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a signal or supply voltage lower than the expected operating range.

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.

B1620 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 B1620 code is set by the Generic Electronic Module (GEM) on Ford vehicles when an open circuit is detected on the rear wiper low limit input. The low limit input is the park position feedback signal from the rear wiper motor that tells the GEM when the wiper has reached its parked rest position. An open here means the GEM no longer sees electrical continuity from the motor park contact through the harness back to the GEM input. When this code is set, the rear wiper may fail to park, may continue to run past the park position, or may stop at random angles after the wiper request is removed.

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