Code Definition

B1621 — Wiper Rear Low Limit Input Circuit Short To Battery

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

About B1621

B1621 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 B1621 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1621 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 B1621 code is set by the Generic Electronic Module (GEM) on Ford vehicles when battery voltage is detected on the rear wiper low limit input circuit. The low limit input is the park position feedback signal from the rear wiper motor, normally pulled by a contact inside the motor between a defined reference state and ground as the wiper passes through park. Unexpected battery voltage on this circuit indicates a short to power, typically caused by chafed insulation in the harness or moisture bridging connector pins. When this code is set, the rear wiper may fail to park correctly, may stop a...

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