Principles of Operation

PRINCIPLES OF OPERATION

Vehicle Security Module
The vehicle security module receives inputs from the following:
- Door ajar switches
- Keyless entry keypad
- Ignition switch
- Remote keyless entry (RKE) transmitter

The vehicle security module uses these inputs to control an output signal to the instrument cluster, which controls the battery saver relay and courtesy lamp relay output.

Interior Lighting Systems
The instrument cluster grounds the interior lamp relay and supplies the power for courtesy lamps when any door ajar switch is opened, or the interior lamp (headlamp) switch is closed. The instrument cluster then supplies voltage to the interior lamp circuit 53 (BK/LB). Vehicle speed must be less than 24 km/h (15 mph) for the instrument cluster to keep the courtesy lamps on. The interior lamps remain illuminated for up to 25 seconds after all doors are closed unless the instrument cluster receives an input from any of the following:
- voltage from the ignition switch.
- a vehicle speed signal.
- input from the keyless entry keypad through the vehicle security module.
- input from the RKE transmitter lock or panic switch through the vehicle security module.

Illuminated Entry
Illuminated entry is activated when the vehicle is unlocked using the keyless entry keypad or the RKE transmitter. In response, the vehicle security module requests that the instrument cluster supply voltage to the interior lamps. Illuminated entry is deactivated when the vehicle security module receives a lock signal from the RKE transmitter. Illuminated entry is also deactivated when the instrument cluster receives a change in ignition switch status.

Battery Saver
The battery saver is activated when the instrument cluster is not receiving voltage input from the ignition switch (OFF position). The instrument cluster then provides ground to the battery saver relay coil. This activates for a period of 10 minutes with the interior lamp (headlamp) switch in the OFF position, or a maximum period of 30 minutes with the interior lamp (headlamp) switch in the ON position, or a door is ajar, provided that the instrument cluster does not receive any other input signals within the time-out period. The activated battery saver relay switches voltage to the demand lamp circuit. After time-out, the instrument cluster removes ground from the battery saver relay coil, disabling the demand lamp circuit.