Automatic Headlamps/Delayed Exit

DESCRIPTION
The Autolamps/Delayed Exit feature turns on the headlamps and grille illumination in low ambient light and keeps them on for a brief period of time after the ignition has been turned off.

OPERATION
Autolamp Feature
Voltage is applied at all times to A/Light (H/L) Relay, A/Light (Tail) Relay, the Grill Lamp Relay and the Autolamp Module. The Autolamp Module wakes up when it receives ignition voltage from Fuse 26 (Electron Ign) and Fuse 20 (Rly Coil). It then looks for a ground signal at pin D and a resistance signal at pin C, indicating that the Autolamp/Delayed Exit feature has been requested. The Module monitors the ambient light conditions by looking at the Autolamp Sensor. The Sensor is a photodiode that conducts only when it senses light. When this Sensor is not conducting, the Autolamp Module grounds terminal A. A ground is applied to circuits LX06 (PK/DB), LX18 (PK/DB) and LX22 (DB/O) through the Autolamp Diode. A/Light (H/L) Relay energizes and applies battery voltage to the Headlamps through the Left and Right Headlamp Relays. The Headlamps light. A/Light (Tail) Relay energizes, applying voltage to the Grill Lamp Relay coil. The F. Grill Lamp Relay energizes, applying voltage to the Grille Illumination Lights. If the vehicle is equipped with DRL, the Daytime Running Lamps (DRL) Module controls voltage to the Right Headlamp.

Delay Exit Feature
When the Autolamps/Delayed Exit feature is engaged and the Ignition Switch is turned off, ignition voltage is removed from the Autolamp Module. The Module continues to ground terminal A for a brief period, based on the resistance input signal at terminal C.