Test I: The Driver Seat Module (DSM) Does Not Communicate With The Scan Tool

PINPOINT TEST I: THE DRIVER SEAT MODULE (DSM) DOES NOT COMMUNICATE WITH THE SCAN TOOL

Normal Operation
The driver seat module (DSM) is optional equipment. The DSM communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the DSM. The DSM shares the MS-CAN network with the smart junction box (SJB), electronic automatic temperature control (EATC) or electronic manual temperature control (EMTC) module, audio control module (ACM), DVD player (if equipped), satellite digital audio receiver system (SDARS) module (if equipped) and the instrument cluster. Voltage for the DSM is provided by circuits SBP12 (GN/RD) and SBB45 (GY/RD). Circuits GD133 (BK) and GD179 (BK/VT) provide ground.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- DSM

I1-I2:

I2-I4: