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

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

P1-P2:

P2-P4:

P5-P7:

P7-P8:

P9-P12:

P12-P16:

P16-P20:

P20-P23:

P23-P25:

P25-P29:

P29-P33:

P33-P36:

P37-P40:

P41-P45:

P46:

Normal Operation
The MS-CAN network uses an unshielded twisted pair cable, circuits VDB06 (GY/OG) and VDB07 (VT/OG) provide the network connection to all modules on the network. The smart junction box (SJB), the instrument cluster, the electronic automatic temperature control (EATC) module (if equipped), the audio unit, the satellite radio receiver (if equipped), the digital versatile disc (DVD) (if equipped), the power running board module (if equipped), the parking aid module (if equipped), and the driver seat module all communicate with the scan tool using the MS-CAN network.

Possible Causes
- Circuit VDB06 (GY/OG) open, short to ground or voltage (MS-CAN +)
- Circuit VDB07 (VT/OG) open, short to ground or voltage (MS-CAN -)
- Circuit VDB06 (GY/OG) (MS-CAN +) and circuit VDB07 (VT/OG) (MS-CAN -) shorted together
- SJB
- Instrument cluster
- Audio unit
- EATC module (if equipped)
- DVD player (if equipped)
- Driver seat module (DSM) (if equipped)
- Satellite radio receiver (if equipped)
- Power running board module (if equipped)
- Parking aid module (if equipped)