Test O: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool

PINPOINT TEST O: THE DRIVER SEAT MODULE (DSM) DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The driver seat module (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 with the instrument cluster (IC), the accessory protocol interface module (APIM), the smart junction box (SJB), the HVAC module (if equipped), the audio control module (ACM), the audio digital signal processing (DSP) module (if equipped), the satellite digital audio receiver system (SDARS) module (if equipped), the parking aid module (PAM) (if equipped), the liftgate/trunk module (LTM) (if equipped), the rear entertainment module (RETM) (if equipped) and the dual climate control seat module (DCSM) (if equipped). Voltage for the DSM is provided by circuits SBP12 (GN/RD) and SBB60 (GN/RD). Circuits GD133 (BK) and GD145 (BK/BU) provide ground.

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

O1:

O2-O3:

O3-O4: