Circuit/System Description

The 14 V power module, often referred to as the accessory DC power control module, converts the high voltage (360 V) direct current (DC) to low voltage (14 V) DC to charge the 12 V battery and to operate the power accessories.

The ECM uses two circuits to control and monitor the state of the 14 V power module, often referred to as the accessory DC power control module.

The status circuit functions much like the F Terminal circuit on a generator equipped vehicle. A high side driver in the 14 V power module applies a duty cycled voltage to the ECM. The duty cycle indicates the 14 V power module internal temperature and operational condition.

The control circuit functions much like the L Terminal circuit on a generator equipped vehicle. A high side driver in the ECM applies a duty cycled voltage to the 14 V power module. The duty cycle controls the 14 V power module output.

The 14 V power module generates more power as the commanded duty cycle increases.