Power Mode Defined
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
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 - if equipped, those modules that have functions enabled in 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.