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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis >> Transmission >> Transfer Case >> Diagnostic Information and Procedures >> Service Indicator Inoperative >> Circuit Description
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Circuit Description

The Service 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and ground of the IPC. The transfer case shift control module controls the Service indicator lamp by sending the IPC a Class 2 message. This lamp may be controlled with the scan tool using the IPC device controls.

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