Pinpoint Test V: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
Communications Network
Pinpoint Test V: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Responding During Network Test
Normal Operation
The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable. Circuits VDB06 (GY/OG) and VDB07 (VT/OG) provide the network connection to all modules on the network. In the event that 1 of the 2 network circuits (MS-CAN + or MS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result.
The following modules communicate with the scan tool using the MS-CAN:
- Accessory Protocol Interface Module (APIM)
- Audio Control Module (ACM)
- Audio Digital Signal Processing (DSP) module
- Power Running Board (PRB) module
- Driver Seat Module (DSM)
- Dual Climate Controlled Seat Module (DCSM)
- Front Controls Interface Module (FCIM)
- Front Display Interface Module (FDIM)
- HVAC module
- Instrument Cluster (IC)
- Parking Aid Module (PAM)
- Power Running Board (PRB) module
- Smart Junction Box (SJB)
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST V: INTERMITTENT NO MS-CAN COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
NOTE: Various network DTCs set while disabling modules in this test procedure which need to be cleared after the diagnostic procedure is completed.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
