For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on. Battery voltage greater than 10 volts.Set Condition:The ECM is requesting the TIPM to turn on the Cooling Fan On and it is not operating.Possible CausesCAN C BUS FAILUREENGINE COOLANT TEMP SENSOR DTCS SETCOOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPMECMAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).1. COOLING FAN RELAY OPERATIONIgnition on, engine not running.With a scan tool, actuate the Cooling Fan.Is the Cooling Fan operating?YesRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)Perform the ECM Verification Test Ver. 1.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)NoGo To 22. CAN C or ECT DTCS CURRENTLY ACTIVEAre any CAN C or ECT DTCs Active at this time?YesRefer to the appropriate diagnostics for the ECT Sensor or CAN C Bus DTC.NoGo To 3 3. COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPMAre any Cooling Fan Control Circuit DTCs set in the TIPM?YesDiagnose the appropriate Cooling Fan Control Circuit DTC in the TIPMNoGo To 4 4. ECMBefore continuing, check the ECM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were there any problems found?YesRepair as necessary.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace and program the Engine Control Module in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)