Code Definition

B2101 — Head Rest Switch Circuit Failure

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2101

B2101 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2101 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.

Because B2101 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Body Control Module (BCM) monitors the power head restraint switch circuit on vehicles equipped with electrically adjustable head restraints. DTC B2101 is set when the BCM detects an electrical fault in the head rest switch circuit, such as an open circuit, short to ground, or short to power on the switch input wires. The power head rest system allows the driver or front passenger to adjust the head restraint position for comfort and safety, using a switch typically located on the seat or door panel. When this code is set the head restraint may fail to move, may move erratically, or may re...

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