For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on.Battery voltage between 10 and 16 volts.IOD fuse installed.TIPM is configured correctly.Set Condition:Bus messages not received for approximately 2 to 5 seconds.Possible CausesCAN B BUS CIRCUITS OPEN OR SHORTEDCAN C BUS CIRCUITS OPEN OR SHORTEDDTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGESTIPM NOT CONFIGURED CORRECTLYPOWER OR GROUND FROM THE REPORTING MODULEMODULE THAT SET THIS DTCPREVIOUS SERVICE PERFORMED WITHIN THE LAST 100 KEY CYCLES (FUSE/RELAYS REMOVED, WIRING SERVICE, BATTERY DISCONNECT)LOW BATTERY/JUMP START CONDITIONIOD FUSE WAS REMOVED DURING SHIPPINGCHECK FOR RELATED TSB'S1. VERIFY DTC IS STOREDStored faults may indicate a customer perceived intermittent condition.Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.With the scan tool, read stored DTC's.Is this DTC stored?YesGo To 2NoDiagnose the active DTC. Refer to the Table of Contents for a list of the symptoms.2. CHECK THE ENVIRONMENTAL DATAWith the scan tool, read the loss of communication environmental data.Does the loss of communication environmental odometer data match up to any of the previous service procedures listed in the possible causes or are there any stored CAN B or C hardware electrical, battery, ignition voltage, VIN missing/mismatch, TIPM configuration DTC's present with matching environmental data?YesThese DTC's may have been the result of other service procedures performed. Clear DTC's.NoGo To 33. VERIFY INTERMITTENT LOST COMMUNICATION DTC – WIRING CONCERNSTurn the ignition on.With the scan tool, select Network View and select Advanced.Is there more than one ECU with stored DTC's “Logged Against” the module and one or more lost communication DTC's stored in the offending module?YesVerify if the vehicle was recently in for this type of service. Otherwise, visually inspect the related wiring harness for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals. Repair as necessary.NoGo To 44. VERIFY INTERMITTENT LOST COMMUNICATION DTC – OFFENDING MODULETurn the ignition on.With the scan tool, select Network View and select Advanced.Is there more than one ECU with stored DTC's “Logged Against” the module and NO lost communication DTC's stored in the offending module?YesCheck for TSB(s) related to this offending module.NoGo To 55. VERIFY INTERMITTENT LOST COMMUNICATION DTC – REPORTING MODULETurn the ignition on.With the scan tool, select Network View and select Advanced.Is there ONLY ONE ECU with stored DTC's “Logged Against” the module?YesCheck for TSB(s) related to the module that set this DTC.NoVerify if the vehicle was recently in for this type of service. Otherwise, visually inspect the related wiring harness for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals. Repair as necessary.