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Home >> Pontiac >> 2003 >> Grand Prix GTP >> Repair and Diagnosis >> Electrical >> Charging Systems >> Diagnostic Tests >> DTC P1637: Output Driver Module Malfunction >> Circuit Description

Circuit Description

Charge indicator has battery voltage supplied when ignition is in RUN and START positions. PCM controls ground for this circuit and will supply ground during bulb check or when a failure is detected due to a generator failure or a battery voltage that is out-of-range.