Test R: The Liftgate/Trunk Module (LTM) Does Not Respond To The Scan Tool

PINPOINT TEST R: THE LIFTGATE/TRUNK MODULE (LTM) DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The liftgate/trunk module (LTM) 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 LTM. The LTM 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 rear entertainment module (RETM) (if equipped), the driver seat module (DSM) (if equipped), and the dual climate control seat module (DCSM) (if equipped). Voltage for the LTM is provided by circuits SBP14 (BN/RD) and SBB59 (BU/RD). Circuit GD149 (BK/GY) provides ground.

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

R1:

R1-R3:

R3-R4: