For a complete wiring diagram Refer to Section 8W.When Monitored:Ignition on. Front Axle Lock engaged.Set Condition:The TIPM detects the Front Locker Control circuit is shorted high.Possible Causes(G304) FRONT LOCKER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGEFRONT LOCKER (OFF-ROAD) RELAYFRONT LOCKER SOLENOIDTOTALLY INTEGRATED CONTROL MODULE (TIPM)1. ACTIVE DTCIgnition on, engine not running.With the scan tool, read DTCs.Is the DTC active at this time?YesGo To 2NoGo To62. FRONT LOCKER SOLENOID OPERATION

Before continuing with the below diagnostic test, ensure the TIPM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.Turn the ignition off.Disconnect the Front Locker Solenoid harness connector.Ignition on, engine not running.Using a 12-volt test light, jump across from the (T520) Front Locker Relay Output circuit and the (Z905) Ground circuit in the Front Locker harness connector.With a scan tool, actuate the Front Locker Solenoid.Does the test light flash on and off?YesInspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid in accordance with the Service Manual.Perform the BODY VERIFICATION TEST – VER 1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).NoGo To 33. FRONT LOCKER (OFF ROAD) RELAY

Turn the ignition off.Verify the Front Locker (OFF-ROAD) Relay is installed properly and that the terminals are making a tight fit.Remove the Front Locker (OFF-ROAD) Relay and substitute it with a known good Relay.Ignition on, engine not running.Using a 12-volt test light, jump across from the (T520) Front Locker Relay Output circuit and the (Z905) Ground circuit in the Front Locker harness connector.With the scan tool, actuate the Front Locker Solenoid.Does the test light illuminate and flash on and off?YesReplace the Front Locker (OFF-ROAD) Relay.Perform the BODY VERIFICATION TEST – VER 1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).NoGo To 44. (G304) FRONT LOCKER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.Disconnect the C2 TIPM harness connector.Remove the Front Locker (OFF-ROAD) Relay.Ignition on, engine not running.Measure the voltage on the (G304) Front Locker Relay Control circuit at the relay connection.Is there any voltage present?YesRepair the (G304) Front Locker Relay Control circuit for a short to voltage.Perform the BODY VERIFICATION TEST – VER 1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).NoGo To 55. TOTALLY INTEGRATED POWER MODULE (TIPM)Before 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 there any problems found?YesRepair as necessary.Perform the BODY VERIFICATION TEST – VER 1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).NoReplace and program the TIPM in accordance with Service Information.Perform the BODY VERIFICATION TEST – VER 1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).6. INTERMITTENT WIRING AND CONNECTORSThe conditions necessary to set this DTC are not present at this time.Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.Wiggle test the wiring harness and connectors while checking for shorted and open circuits.Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.Were there any problems found?YesRepair as necessary.Perform the BODY VERIFICATION TEST – VER 1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).NoTest Complete.