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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC B1487 >> Circuit/System Description

Circuit/System Description

The generator battery control module (GBCM) controls the generator through the turn on signal circuit, or L-Terminal circuit. The signal is a 5 V pulse width modulation (PWM) signal of 128 hz. Normal duty cycle when the engine is running is 5-100 percent.

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