Normal Operation

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The Dual Climate Controlled Seat Module (DCSM) supplies a speed control signal voltage to the passenger seat backrest Thermo-Electric Device (TED) on circuit VHS21 (BU/WH). The TED blower is supplied operating voltage from DCSM output circuit CHS08 (BN/YE) and ground from DCSM output circuit RHS08 (VT/WH).

DTC B19A2 (Passenger Seat Back Blower Speed Short to Battery) - If the passenger seat backrest blower speed circuit is shorted to voltage, the DCSM will shut down the passenger seat system and set this DTC.
This pinpoint test is intended to diagnose the following:
Wiring, terminals or connectors
TED and blower assembly
DCSM