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

NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).

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 (IC) communicate with the scan tool using the MS-CAN.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Audio control module (ACM)
- IC
- SDARS module
- Smart junction box (SJB)

I1-I2:

I3-I4:

I5-I7:

I7-I8:

I9-I12:

I12-I14:

I14-I17:

I17-I20:

I21: