Corolla LE Sedan L4-1.8L (1ZZ-FE) (1999)
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Automatic Light Control Sensor: Description and Operation
AUTOMATIC LIGHT CONTROL OPERATION
When the daytime running light is operating and the Automatic control sensor detects a decrease in the ambient light (It continues less than approx. 2500
lux over about 20 seconds, and it is less than 1000 lux.), the automatic light control operation starts. At the same time, daytime running light relay
(Main) is activated, so current flows from the ALT fuse to the TAIL relay (Coil side) to TERMINAL 16 of the daytime running light (DRL) relay
(Main), and the DRL fuse to the DRL relay (Coil side) to TERMINAL 18 of the daytime running light relay (Main), activating both the TAIL relay and
the DRL relay, so that the taillights and headlights light up.
When the automatic light control sensor detects an increase in the ambient light (It continues more than approx. 1000 lux over about 20 seconds, and it
is more than approx. 2500 lux), the ignition SW is turned to OFF, the light control SW is turned to HEAD position. and the automatic light control
operation stops.
