Principles of Operation (How Does It Work?)

NOTE: The ignition switch must be cycled from OFF to RUN to enable the switched system power feature. The Switched system power will remain active for one half-hour after the ignition is turned OFF.

Switched System Power (SSP)
The SSP is invoked by both the FEM and REM. This function removes power from relays that provide power to the exterior lamps, interior lamps, and power door locks. This is only accomplished when both the FEM and the REM are in sleep mode. The sleep function of the FEM and REM places the modules in sleep mode when the ignition switch is in the OFF position, and no wake up (inputs) signals occur for 30 minutes. The module will not sleep if the parking lamps or the hazard lamps are active. The following relays are controlled by the SSP function: SSP1, SSP2, SSP3, and SSP4. When either the FEM or REM are not in sleep mode, all SSP relays will be energized. When energized, each relay will supply power to multiple features/functions. Refer to the SSP Index for diagnosis and testing of SSP related issues. SSP Relay Index