Circuit Inputs

Inputs to the Accessory DC Power Control Module include the high voltage and 12 volt circuits. The Accessory DC Power Control Module also has two 12 volt discrete inputs, Accessory and Run/Crank, either one has to be at a high level in order for it to wake up. The Accessory DC Power Control Module is connected to the GMLAN powertrain expansion communication circuit and communicates with the Hybrid Powertrain Control Module. The Accessory DC Power Control Module monitors various internal components for current, voltage and temperature. The Accessory DC Power Control Module will not begin supplying 12 volts DC until:

• Either the Accessory input or Run/Crank input are high, AND
• The appropriate GMLAN enable signal is communicated by the Hybrid Powertrain Control Module.

The Accessory DC Power Control Module will not begin conversion of voltage however, until the appropriate GMLAN enable signal is communicated to it by the Hybrid Powertrain Control Module.

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