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

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

F1-F3:

F3-F5:

F6:

Normal Operation
The DSM communicates with the diagnostic tool through the universal asynchronous receiver transmitter (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 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 circuit 693 (OG), damage to the DLC C251, damage to the DSM C341g, or a problem in the in-line connector.

The power driver seat and power outside rear view mirrors are controlled by the DSM only when the vehicle is equipped with the programmable/recall memory option. Voltage is supplied through central junction box (CJB) fuse 2 (10A) and battery junction box (BJB) fuse 21 (30A) on circuits 1003 (GY/YE) and 566 (DG), and grounded through circuit 1203 (BK/LB) and 1205 (BK).

Possible Causes
- circuit 566 (DG) open
- circuit 1003 (GY/YE) open
- circuit 1203 (BK/LB) open
- circuit 1205 (BK) open
- UBP communications network circuit 693 (OG) open
- DLC C251
- DSM
- DSM C341g