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Home >> Chevrolet >> 2000 >> Lumina >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L >> Diagnostic Tests >> DTC P1637: Charging System Light Control Circuit >> Circuit Description

Circuit Description

Output Driver Modules (ODM) are used by PCM to turn on many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which PCM is commanding on. PCM turns on the bulb, LED, or driver info center indicator by supplying a path to ground through the PCM.