Vehicle: 2014 Jeep Grand Cherokee, 4WD, V6 3.6L, Automatic Transmission
Problem: With a scan tool, the technician checked activation status in the power lift gate module to see if module was receiving a signal when a switch was pressed (handle switch, interior switch or remote key fob). Yes, it was receiving a signal to open from all inputs. He then checked in the body control module (BCM) trunk release data and noticed that it was switching from “pressed” to “not pressed” on its own – without pressing a button (see BCM PID screen). Next, he unplugged all the switches and the trunk release data revealed that it was still switching in the BCM.
Details: The technician tested communication with all of the modules and looked for diagnostic trouble codes (DTCs). He found communication with the body control module (BCM) to be intermittent and no DTCs were present. After looking at the CAN B circuit diagram, he went to the fuse block in the
Confirmed Repair: The technician opened the BCM and found traces of water damage and some corrosion on the circuit board. He replaced the BCM and the issue was resolved.