Malfunction Indicator Lamp (MIL) Diagnosis
Diagnostic Instructions
Circuit/System Description
Ignition 1 voltage is supplied directly to the malfunction indicator lamp (MIL). The engine control module (ECM) turns the MIL ON by sending a request to the instrument panel cluster (IPC) via the CAN communication circuit. The MIL should be on steady with the ignition ON and the engine OFF. When the engine is started, the MIL should turn OFF.
Reference Information
Schematic Reference
Connector End View Reference
Component Connector End Views
Description and Operation
Instrument Cluster Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
- Ignition ON, verify that there are no diagnostic trouble codes (DTCs) set.
- Engine running, command the MIL ON and OFF with a scan tool. The MIL should respond to the scan tool commands.
⇒ | If the MIL does not respond properly, replace the instrument panel cluster. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for instrument panel cluster replacement, setup, and programming
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