Circuit Inputs

Inputs to the 14V power module include the high voltage and 12V circuits. The 14V power module also has two 12V discrete inputs, Accessory and Run/Crank, either one has to be at a high level in order for it to wake up. The 14V power module is connected to the powertrain expansion communication bus and communicates with the hybrid/EV powertrain control module 1. The 14V power module monitors various internal components for current, voltage and temperature. The 14V power module will not begin supplying 12V DC until:

• Either the Accessory input or Run/Crank input are high, and
• The appropriate serial data enable signal is communicated by the hybrid/EV powertrain control module 1.

The 14V power module will not begin conversion of voltage however, until the appropriate serial data enable signal is sent by the hybrid/EV powertrain control module 1.

For more information on the 12V Battery Charging System, refer to Charging System Description and Operation .