Power Mode Defined

The power mode is the information used by the various control modules on the vehicle to determine operation. If a control module does not receive a power mode signal, either a serial data message or a hard wire input, the control module does not operate.

No operations using two or more modules is possible without a power mode decision by the power mode master (PMM) and a power mode message from the PMM. The possible power modes are:

• OFF-ASLEEP, no activity on the serial data circuits, the modules are asleep and in their minimum power usage state.
• OFF-AWAKE, activity on the serial data circuits, the modules are awake and expecting either serial data or hardwire inputs.
• RAP, those module that have functions enabled in Retained Accessory Power (RAP) are fully operational, the rest will be OFF-AWAKE.
• ACCESSORY, those module that have functions enabled in ACCESSORY are fully operational, the rest will be OFF-AWAKE.
• RUN, all modules are fully functional.
• CRANK, those modules that have no function critical to engine starting are OFF to both provide maximum power for cranking and starting operation and to limit customer concerns, i.e. audio system noise.