Test Q: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

PINPOINT TEST Q: NO MEDIUM SPEED CONTROLLER AREA NETWORK (MS-CAN) COMMUNICATION, ALL MODULES ARE NOT RESPONDING

Normal Operation
The medium speed controller area network (MS-CAN) uses an unshielded twisted pair cable, circuits VDB06 (GY/OG) and VDB07 (VT/OG). The smart junction box (SJB), audio unit, electronic automatic temperature control (EATC) or electronic manual temperature control (EMTC) module, satellite radio receiver, front display interface module (FDIM) and front control interface module (FCIM) communicate with the scan tool using the MS-CAN network. The instrument cluster, while on the MS-CAN network, communicates with the scan tool only on the HS-CAN network.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Instrument cluster
- SJB
- Audio unit
- FCIM (if equipped)
- Electronic automatic temperature control (EATC) module (if equipped)
- Electronic manual temperature control (EMTC) module (if equipped)
- Satellite radio receiver (if equipped)
- FDIM

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