Normal Operation

Several modules receive network messages from the Smart Junction Box (SJB) via the Medium Speed Controller Area Network (MS-CAN). The following information is included in the messages:

• Ignition switch position

All modules receiving a particular message should exhibit a symptom if the message is missing.

• DTC U0140 (Lost Communication With Body Control Module (GEM)) - set by the Parking Aid Module (PAM) when network messages are missing from the SJB for greater than 5 seconds with the ignition in RUN.

This pinpoint test is intended to diagnose the following: 

• Module communication
• PAM
• SJB