Test B

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

Test B1-B3:

Test B4-B6:

Test B7:

Normal Operation
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 C341g, 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).

Possible Causes
- CJB fuses:
- 20 (5A)
- 1 (30A)

- UBP circuit 693 (OG) shorted to ground or open
- circuit 1003 (GY/YE) open or shorted to ground
- circuit 566 (DG) open or shorted to ground
- circuit 1203 (BK/LB) open
- circuit 1205 (BK) open
- DLC C251
- DSM