Test M
PINPOINT TEST M: NO UART BASED PROTOCOL (UBP) NETWORK COMMUNICATIONTest M1-M4:
Test M5-M9:
Test M10-M13:
Test M14-M17:
Test M18-M22:
Test M23-M24:
Normal Operation
The driver seat module (DSM), vehicle security module, and the 4-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 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, damage to the DSM, vehicle security module, the 4WD control module, instrument cluster, or a problem in one of the in-line connectors C2095, C2108 or 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
- DLC C251
- 693 (OG)
- in-lines C2095, C2108 or C408
- diagnostic tool
- vehicle security module
- DSM
- 4WD control module
- instrument cluster