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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1641 - A/C Relay Control Circuit >> Circuit Description
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Circuit Description

Output Driver Modules (ODM) are used by the PCM to turn on current-driven devices needed to control various engine and transaxle functions. Each ODM can control up to 7 output by supplying ground to the device PCM is commanding on. ODMs can diagnose each circuit individually. DTC will set when ODM detects an improper voltage level.

Conditions required to set DTC are: