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Home >> GMC >> 2009 >> Yukon Hybrid, 4WD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Hybrid Engine Controls - Introduction >> Description and Operation >> Drive Motor Generator Control Module Description and Operation >> Accessory DC Power Control Module (APM) >> Operating Functions

Operating Functions

The APM is the device which converts high voltage (300V) direct current (DC) to low voltage (12V) DC for accessory electrical operation and to charge the 12 volt accessory battery. The APM also converts HV DC to intermediate (42V) DC to supply the electric power steering system with voltage. The APM is capable of supplying up to 175 Amps of 12 volt DC and up to 50 Amps of 42 volt DC. In Jump Assist mode the APM converts 12 volt DC to HV DC to charge the high voltage hybrid batteries. The APM is capable of supplying up to 2.7 Amps at 290 volts DC on the high voltage circuit when operating in Jump Assist. An external 12V DC battery charger is required during the Jump Assist mode because the APM and vehicle controllers may draw as much as 80 Amps of current from the vehicles 12 volt DC system.

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