LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lincoln >> 2004 >> Town Car Protection Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 361 (Module Communications Network) >> Diagnosis And Testing >> Communications Network >> Pinpoint Test B: The Driver Seat Module (DSM) Does Not Respond To The Diagnostic Tool >> Normal Operation
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Normal Operation

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

The DSM communicates with the diagnostic tool through the UART-based protocol (UBP) communications network circuit 693 (OG). If circuit 693 (OG) becomes open or shorted to ground, communications to that module will not be possible. Check circuit 693 (OG) between the DSM C341g 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 circuit 693 (OG), damage to the DLC C251, damage to the DSM C341 g, or a problem in the in-line connectors.

Power is supplied through CJB fuses: 20 (5A), 1 (30A) on circuits 1003 (GY/YE), 566 (DG) and grounded through circuits 1203 (BK/LB) and 1205 (BK).

scientia non olet · About LEMON Manuals