Aviator AWD V8-4.6L DOHC VIN H (2003)
Test Q39-Q42
Normal Operation
The climate controlled seat module, driver seat module (DSM), vehicle security module, and the four-wheel drive (4WD) control module
communicate 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 driver climate
controlled seat module, passenger climate controlled seat module, DSM, vehicle security module, and the 4WD control 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 circuit 693 (OG), damage to the DLC
C251 or damage to the climate controlled seat module, DSM, vehicle security module, the 4WD control module, instrument cluster, or a problem in
one of the in-line connectors C212 and C408. If, after individual checks of each circuit leading to a module show resistance values less than 5 ohms
and no in-line connector issues present, the data link diagnostics test must be run with the module in question disconnected. If the data links
diagnostics test passes with the module in question disconnected, it is the source of the concern and should be removed and a new module installed.
Possible Causes
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DLC C251
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diagnostic tool
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693 (OG)
