Ignition 1 voltage is supplied directly to the water in fuel lamp. The engine control module (ECM) turns the water in fuel lamp ON by sending a request to the instrument panel cluster (IPC) via the CAN communication circuit. The ECM monitors the amount of water in the fuel with a sensor located in the fuel filter assembly. When the water in the fuel is above an acceptable level, the ECM sends a request to illuminate the water in fuel lamp.

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Displays and Gages Connector End Views

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference

Scan Tool Reference

1. Ignition ON, verify that the following diagnostic trouble codes (DTCs) are not set: U0100, U0155, U2105.

⇒	If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Command the water in fuel lamp ON and OFF with a scan tool. The water in fuel lamp should respond to the scan tool commands.

⇒	If the water in fuel lamp does not respond properly, replace the IPC.

Perform the Diagnostic Repair Verification after completing the repair.