System Description

EXTERIOR LIGHTING
The low and high beam headlamps are controlled directly by an output from the Central Timer Module (CTM). The park lamps and fog lamps (on vehicle so equipped) are controlled via external relays that are energized by the CTM. The headlamp switch provides the control signal through the multifunction switch to the CTM, which indicates low or high beam operation.

The Optical Horn (Flash to Pass) feature operates both the high beam and low beam headlamps.

The CTM provides the Headlamp Time Delay feature. To start the delay, turn the ignition OFF while the headlamps are ON. Then turn the headlamp switch to the OFF position. This has to be done within 45 seconds of the ignition being turned OFF. The headlamps will remain ON for 60 ± 5 seconds. If during this delay period the headlamp switch is turned ON and then OFF, or ignition switch is turned ON delay will be canceled and they will turn OFF immediately. During the delay period, only head- lamps are turned ON and park lamps/fog lamps are turned OFF.

The CTM also provides battery protection to avoid wearing down the battery if the customer leaves the park lamps or headlamps ON for extended period of time with the ignition OFF. If the park lamps or headlamps remain ON for more than 5 minutes while the ignition is OFF, the headlamps and park lamps shall be turned OFF and the input causing the lamps to be ON will be ignored until the input is corrected. Once the 5 minute timeout has extinguished the headlamps and park lamps, any change in the ignition switch, door ajar switches, headlamps switch or park lamp switch will reset the 5 minute timer and return the headlamps and park lamps to normal operation.

INTERIOR LIGHTING
The Courtesy lights and illuminated entry feature are controlled by the Central Timer Module (CTM). The CTM will activate the courtesy lamps, including Map Lights and the Dome Lights when either the dome lamp switch is turned ON or a door is opened. The courtesy lamps will fade to OFF immediately when all doors are closed with the dome lamp switch in the OFF position.

The illuminated entry feature operates under the following conditions:
- RKE "unlock"
- Driver/Passenger door is opened
- Unlocking either the driver or passenger using the key (vehicles equipped with security system)
- The dome lamp switch is turned ON

Once activated, the illuminated entry will "fade to OFF" after 3 to 5 seconds under the following conditions:

All doors are closed and:
- RKE "lock signal is received or
- Manual actuated power "lock" signal is received or
- Ignition switch is turned to the ON position or
- 30 seconds have elapsed without any other action

Addition RKE unlock actuation before the expiration of illuminated entry will not reset timer. Opening any door before the 30 second timer expires, will reset the entry time to 30 seconds and the illuminated entry timer will not begin counting down again until all doors are closed.

The Cargo lamps are controlled by the CTM. Placing the dome lamp switch in the cargo lamp position grounds an input to the CTM. The CTM then sends voltage to the cargo lamps.

The Interior lamp defeat feature will riot allow any interior lamp to be turned ON. This is accomplished through an input to the CTM from the dome lamp switch.

The CTM provides battery protection by shutting down the interior lamps due to the following.

Leaving a door open, dome lamp switch ON, reading/ vanity lamp switch ON or glove box door open for more than 15 minutes while the ignition is OFF.