Pinpoint Test AK : DTC B19A4: Notes
WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Climate Controlled Seats , for schematic and connector information.
Normal Operation
The Front Seat Climate Control Module (SCME) supplies a speed control signal voltage to the driver seat backrest TED on circuit CHS04 (YE/GY). The TED blower is supplied operating voltage from Front Seat Climate Control Module (SCME) output circuit CHS13 (VT/BN) and ground from Front Seat Climate Control Module (SCME) output circuit CHS03 (GN/BN).
- DTC B19A4 (Driver Seat Back Blower Speed Short to Battery) - If the driver seat backrest blower speed circuit is shorted to voltage, the Front Seat Climate Control Module (SCME) will shut down the driver seat system and set this DTC.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TED and blower assembly
- Front Seat Climate Control Module (SCME)