Operating Functions

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

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.