Malfunction Indicator Lamp (MIL) Inoperative

MALFUNCTION INDICATOR LAMP (MIL) INOPERATIVE

CIRCUIT DESCRIPTION
There should always be a steady malfunction indicator lamp (MIL) when the ignition switch is in the ON position and the engine is not running. System voltage is applied to the indicator bulb and the instrument panel cluster (IPC) provides a path to ground. Once the engine starts, the IPC turns OFF the MIL. When an engine control system malfunction occurs, the PCM sends a message over the controller area network (CAN) to the body control module (BCM) requesting the MIL. The BCM then sends a message to the IPC over class 2 requesting MIL illumination.

TEST DESCRIPTION

Steps 1-4:

The numbers below refer to the step numbers on the diagnostic table.
2. If other instrument panel cluster (IPC) functions are not working correctly check for an open fuse or for a lack of power and ground to the IPC.