Interior Light Circuit: Description

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

The interior light control of the illuminated entry system is controlled by the main body ECU. The operation and condition of this control are described below.

OPERATION CONDITION

Operation	Condition
Fade in	When any of the following conditions is met, the interior light, front seat illumination, rear seat illumination and rear door courtesy lights fade in. The key enters any actuation area around the doors when the engine switch is off and all doors are closed. Any door is opened. Any door is unlocked when the engine switch is off and all doors are closed. The engine switch is turned from on (ACC) to off when all doors are closed.
Fade out immediately	When either of the following conditions is met, the interior light, front seat illumination, rear seat illumination and rear door courtesy lights fade out. The engine switch is turned from off to on (ACC or IG) when all doors are closed. All doors are locked when the engine switch is off.
Illuminate for approximately 15 seconds, and then fade out	All doors are closed when the engine switch is off.

HINT:

When any of the lights do not illuminate, perform the inspection according to the PROBLEM SYMPTOMS TABLE. When all of the lights (interior light, front seat illumination, rear seat illumination, and rear door courtesy lights) do not illuminate, perform the ACTIVE TEST of the illuminated entry system. If it is normal, there may be a malfunction in the door courtesy switch circuit, door lock position switch circuit, or engine switch circuit.