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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 B1390 >> Circuit/System Description

Circuit/System Description

The generator battery control module (GBCM) monitors the battery voltage for precision electrical power management. The GBCM monitors both the RVC PWR B+ circuit and the RVC VSENSE B+ circuit to precisely determine system voltage. If the RVC VSENSE B+ circuit is 1.5 V less than the RVC PWR B+ circuit for 7 seconds, then DTC B1390 will set.

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