Test R: The Power Running Board (PRB) Module Does Not Respond To The Scan Tool

PINPOINT TEST R: THE POWER RUNNING BOARD (PRB) MODULE DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The power running board (PRB) module 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 PRB module. The PRB module shares the MS-CAN with the instrument cluster (IC), the smart junction box (SJB), the heating ventilation air conditioning (HVAC) module - electronic manual temperature control (EMTC) (if equipped), the heating ventilation air conditioning (HVAC) module - electronic automatic temperature control (EATC) (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), the audio rear control unit (RCU) (if equipped), the driver seat module (DSM) and the dual climate control seat module (DCSM) (if equipped). Voltage for the PRB module is provided by circuit SBB07 (WH/RD). Circuit GD143 (BK/VT) provides ground.

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

R1:

R2-R3:

R4: