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Home >> GMC >> 1999 >> Forward Control 7.4 J >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P1537-U1193 >> DTC P1663 >> DTC P1663: Generator Light Control Circuit (3.8L "G" Body) >> Circuit Description
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Circuit Description

PCM turns on bulb, LED or driver information center indicator by supplying ground through the PCM. DTC will set when ignition is on, an improper voltage level has been detected on generator light driver circuit and conditions are present for at least 30 seconds.

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