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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1432 (HVAC Systems - Manual) >> Diagnostic Information and Procedures >> DTC B1375: Device Ignition 3 (ON) Circuit >> Circuit Description

Circuit Description

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The ignition 3 voltage circuit is a discrete input to the HVAC control module. The HVAC control modules uses the input to determine that the ignition switch is in the RUN position. When the ignition switch is in the RUN position, ignition voltage is applied to the input.

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