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Light Control

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
LIGHT CONTROL SYSTEM

Symptom/Suspect Area See
Automatic Light Control Does Not Operate
Light Sensor Circuit (1)
Headlight Control Switch Circuit (2)
Body ECU (3)
Auto Turn-Off Does Not Operate
Door Courtesy Switch Circuit (Driver Side) (4)
Ignition Switch (5)
Driver Door ECU (3)
Body ECU (3)
(1) AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT 
(2) LIGHT CONTROL SWITCH CIRCUIT 
(3) HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
(4) DOOR COURTESY SWITCH CIRCUIT 
(5) IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH