Test I: The Driver Seat Module (DSM) Does Not Respond To The Diagnostic Tool

PINPOINT TEST I: THE DRIVER SEAT MODULE (DSM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

I1-I2:

I3:

Normal Operation
The DSM communicates with the diagnostic tool through the medium speed controller area network (CAN), circuits VDB06 (GY/OG) and VDB07 (VT/OG).

Check the medium speed CAN circuits VDB06 (GY/OG) and VDB07 (VT/OG) between the DSM C3299c and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the high speed CAN circuits, damage to the DLC C251, damage to the DSM C3299c, or a problem in an in-line connector.

Possible Causes
- medium speed CAN data plus circuit VDB06 (GY/OG) open
- medium speed CAN data minus circuit VDB07 (VT/OG) open
- DSM C3299c
- DSM