Code Definition

B2174 — Window Driver Rear Remote Up Switch Short to Battery

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

About B2174

B2174 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 B2174 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

Because B2174 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 input from the Driver Rear Remote Up Switch, which is the switch on the driver's master window control panel that commands the rear driver side window to move up. DTC B2174 is set when the BCM detects a short to battery voltage on the signal wire for this switch input, meaning the circuit is showing battery voltage when the switch is in the rest (not pressed) position. The remote window switches typically use a momentary contact arrangement that grounds the BCM input when pressed, so a continuous high voltage signal cannot be a valid switch state. Whe...

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