Mark LT 4WD V8-5.4L VIN 5 (2006)
Normal Operation
The RCM communicates with the diagnostic tool through the international standards organization (ISO) 9141 communications network circuit 70
(LB/WH).
Check the ISO 9141 circuit between the RCM C310a and the data link connector (DLC) C251. The total resistance value must not be more than 5
ohms. If the resistance is more than 5 ohms there is an open in circuit 70 (LB/WH), damage to the DLC C251, or damage to the C310a.
Possible Causes
-
ISO 9141 circuit 70 (LB/WH) open
-
RCM C310a
-
RCM
Test D: The Driver Seat Module (DSM) Does Not Respond to the Diagnostic Tool
PINPOINT TEST D: THE DRIVER SEAT MODULE (DSM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL
D1-D3
Normal Operation
The DSM communicates with the diagnostic tool through the universal asynchronous receiver transmitter (UART)-based protocol (UBP)
communications network circuit 1906 (VT).
Check the UBP circuit between the DSM C341c and the data link connector (DLC) C251. The total resistance value must not be more than 5 ohms. If
the resistance is more than 5 ohms there is an open in circuit 1906 (VT), damage to the DLC C251, damage to the DSM C341c, or a problem in the
in-line connector.
