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

Q1-Q2:

Q2-Q4:

Q5-Q7:

Q7-Q8:

Q8-Q10:

Q10-Q13:

Q13-Q17:

Q17-Q21:

Q21-Q24:

Q25-Q27:

Q27-Q30:

Q30-Q34:

Q34-Q38:

Q38-Q41:

Q42-Q45:

Q46-Q50:

Q51-Q52:

Normal Operation
The MS-CAN uses an unshielded twisted pair cable, circuits VDB06 (GY/OG) and VDB07 (VT/OG). The smart junction box (SJB), the instrument cluster, the electronic automatic temperature control (EATC) module (if equipped), the dual automatic temperature control (DATC) module (if equipped), the audio unit, the THX(R) amplifier (if equipped), the satellite radio receiver (if equipped), the driver seat module (DSM) (if equipped), the driver door module (DDM) (if equipped) and the climate controlled seat module (if equipped) all communicate with the scan tool using the MS-CAN.

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
- THX(R) amplifier (if equipped)
- EATC module (if equipped)
- DATC module (if equipped)
- DDM (if equipped)
- DSM (if equipped)
- Climate controlled seat module (if equipped)
- Satellite radio receiver (if equipped)