Normal Operation
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
The driver or passenger climate controlled seat module communicates with the diagnostic tool through the UART-based protocol (UBP) communications network circuit 2077 (PK/LB). If the UBP circuit becomes open or shorted to ground communications to that module will not be possible. Check circuit 2077 (PK/LB) between the climate controlled seat module and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open in UBP network circuit, damage to the DLC C251, damage to the climate controlled seat module connector, or a problem in the in-line connectors.