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Home >> Saturn >> 2007 >> VUE AWD V6-3.5L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Malfunction Indicator Lamp (MIL) Inoperative
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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 powertrain control module (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

Step 1 - Step 4:




The number below refers to the step number on the diagnostic table.
2. If other IPC functions are not working correctly, check for an open fuse or for a lack of power and ground to the IPC.
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