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. The TIPM detects a short to voltage in the Relay Coil Control circuit. One Trip Fault. Three good trips to turn off the MIL.Possible Causes(K175) HIGH SPEED COOLING FAN RELAY CONTROL CIRCUIT SHORTED TO VOLTAGEHIGH SPEED COOLING FAN RELAYTOTALLY INTEGRATED POWER MODULEAlways 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 High Speed Cooling Fan Relay RAD FAN 2.Is the Cooling Fan operating?YesRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)NoGo To 22. HIGH SPEED COOLING FAN RELAYTurn the ignition off.Verify the High Speed Cooling Fan Relay is installed properly and that the terminals are making a tight fit.Remove the High Speed Cooling Fan Relay and substitute it with a known good Relay.Ignition on, engine not running.With a scan tool, actuate the High Speed Cooling Fan Relay.Is the Cooling Fan operating?YesReplace the High Speed Cooling Fan Relay.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 3 3. (K175) HIGH SPEED COOLING FAN RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.Disconnect the C3 TIPM harness connector.Remove the High Speed Cooling Fan Relay.Ignition on, engine not running.Measure the voltage on the (K175) High Speed Cooling Fan Relay Control circuit at the relay connection.Is there any voltage present?YesRepair the short to voltage in the (K175) High Speed Cooling Fan Relay Control circuit.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44. TOTALLY INTEGRATED POWER MODULEBefore continuing, check the TIPM 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 any problems found?YesRepair as necessary.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace the Totally Integrated Power Module per Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)