Normal Operation

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The Smart Junction Box (SJB) and the Instrument Cluster (IC) communicate using the Medium Speed Controller Area Network (MS-CAN). Messages are exchanged between the modules on the MS-CAN for the purposes of determining what functions are being carried out.

DTC U0155 (Lost Communication With Instrument Panel Cluster (IC) Control Module) - set by the SJB whenever it loses communication with the Instrument Cluster (IC) if the ignition is not in the START position, the SJB supply voltage is greater than 10.5 volts and the ignition must be in the on position for a minimum of 5 seconds.

This pinpoint test is intended to diagnose the following:

Module communication
SJB
IC