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

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

I1:

I1-I2:

I3-I4:

I5-I7:

I7-I9:

I9-I11:

I11-I13:

Normal Operation
The MS-CAN uses an unshielded twisted pair cable, circuits 1847 (WH/OG) and 1848 (PK/OG). The smart junction box (SJB) and the instrument cluster communicate with the scan tool using the MS-CAN network.

Possible Causes
- Circuit 1847 (WH/OG) open, short to ground or voltage (MS-CAN +)
- Circuit 1848 (PK/OG) open, short to ground or voltage (MS-CAN -)
- Circuit 1847 (WH/OG) (MS-CAN +) and circuit 1848 (PK/OG) (MS-CAN -) shorted together
- SJB
- Instrument cluster