Pinpoint Test Cc : DTC U0140: Notes

Refer to Module Communications Network for schematic and connector information.

Refer to Memory Seats for schematic and connector information.

Normal Operation 

The Driver Seat Module (DSM) and the Body Control Module (BCM) 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 U0140 (Lost Communication With Body Control Module (GEM)) - set by the DSM whenever it has lost communication to the BCM for 15 seconds or longer as long as the module voltage is between 10 and 15 volts.

This pinpoint test is intended to diagnose the following: 

• Module communication
• DSM
• BCM