Lighting System (Interior) (Diagnostics & Circuit Tests): Overview Lexus IS III

SYSTEM DESCRIPTION [04/2013 - ]

1. ILLUMINATED ENTRY SYSTEM The illuminated entry system has the following control functions: Control Outline Lights that Operate Actuation Area-linked When a registered key enters any actuation area around the doors, the lights that operate turn on. Engine Switch Illumination Map Light Assembly (Front Dome Light) Spot Light Assembly (Rear Dome Light) No. 1 Interior Illumination Light Assembly LH No. 1 Interior Illumination Light Assembly RH When a registered key leaves all of the actuation areas around the doors, the lights that operate turn off. Door Lock/Unlock-linked When any door is unlocked, the lights that operate turn on. Engine Switch Illumination Map Light Assembly (Front Dome Light) Spot Light Assembly (Rear Dome Light) No. 1 Interior Illumination Light Assembly LH No. 1 Interior Illumination Light Assembly RH Front Door Inside Handle Illumination Light Assembly LH Front Door Inside Handle Illumination Light Assembly RH When all doors are locked, the lights that operate turn off. Door Open/Close-linked When any door is opened, the lights that operate turn on. Engine Switch Illumination Map Light Assembly (Front Dome Light) Spot Light Assembly (Rear Dome Light) No. 1 Interior Illumination Light Assembly LH No. 1 Interior Illumination Light Assembly RH Front Door Inside Handle Illumination Light Assembly LH Front Door Inside Handle Illumination Light Assembly RH When all doors are closed, the lights that operate turn off. Engine Switch-linked When the engine switch is turned from on (ACC or IG) to off, the lights that operate turn on. Engine Switch Illumination Map Light Assembly (Front Dome Light) Spot Light Assembly (Rear Dome Light) No. 1 Interior Illumination Light Assembly LH No. 1 Interior Illumination Light Assembly RH When the engine switch is turned from off to on (ACC or IG), the lights that operate turn off. Delay When approximately 15 seconds elapse after any of the following conditions is met, the lights that operate turn off: An actuation area-linked function is used. The door unlock-linked function is active. Any door is opened and then all doors are closed when the engine switch is off. Engine Switch Illumination Map Light Assembly (Front Dome Light) Spot Light Assembly (Rear Dome Light) No. 1 Interior Illumination Light Assembly LH No. 1 Interior Illumination Light Assembly RH When approximately 15 seconds elapse after either of the following conditions is met, the lights that operate turn off: The door unlock-linked function is active. Any door is opened and then all doors are closed when the engine switch is off. Front Door Inside Handle Illumination Light Assembly LH Front Door Inside Handle Illumination Light Assembly RH Battery Saving When 20 minutes elapse after the engine switch is turned from on (ACC or IG) to off and the lights that operate remain on, the lights are turned off. HINT: Battery saving control is canceled when any of the following operations is performed before the lights are turned off by battery saving control. After the operation is performed, the lights remain on for another 20 minutes and then the lights are turned off. The engine switch is turned on (ACC or IG). Any door is opened and closed. The luggage compartment door is opened and closed. Any door is unlocked. The key enters any exterior actuation area. Engine Switch Illumination Map Light Assembly (Front Dome Light, Front Map Light) Spot Light Assembly (Rear Dome Light, Rear Map Light) No. 1 Interior Illumination Light Assembly LH No. 1 Interior Illumination Light Assembly RH No. 1 Luggage Compartment Light Assembly Vanity Light Assembly LH Vanity Light Assembly RH Front Door Inside Handle Illumination Light Assembly LH Front Door Inside Handle Illumination Light Assembly RH Courtesy Light Assembly LH Courtesy Light Assembly RH

OPERATION CHECK [04/2013 - ]

1. INSPECT INTERIOR LIGHT CONTROL OPERATION NOTE: Perform this inspection with the customize parameters at the initial settings. The interior light control illuminates the lights below. Engine Switch Illumination Map Light Assembly (Front Dome Light) Spot Light Assembly (Rear Dome Light) No. 1 Interior Illumination Light Assembly LH No. 1 Interior Illumination Light Assembly RH The operations and conditions of this control are described below. Operation Condition Fade in and illuminate constantly Any door is opened when all doors are closed. Illuminate for 15 seconds, and then fade out When any of the following conditions is met, the interior lights illuminate for 15 seconds, and then fade out: The key enters any actuation area around the doors when the engine switch is off and all doors are closed.*1 Any door is unlocked when the engine switch is off with all doors closed and locked. The engine switch is turned from on (IG) to off when all doors are closed. All doors are closed after any door is opened when the engine switch is turned off. Fade out immediately When any of the following conditions is met, the interior lights fade out immediately: The engine switch is turned from off to on (ACC) when all doors are closed. All doors are locked when the engine switch is off, all doors are closed and any door is unlocked. All doors are locked again when all doors are already closed and locked. *1: When the lights are on, if the key leaves all of the actuation areas around the doors, after approximately 3 seconds, the lights fade out.
2. INSPECT INSIDE HANDLE LIGHT CONTROL OPERATION NOTE: Perform this inspection with the customize parameters at the initial settings. The inside handle light control illuminates the lights below. Front Door Inside Handle Illumination Light Assembly LH Front Door Inside Handle Illumination Light Assembly RH The operations and conditions of this control are described below. Operation Condition Fade in and illuminate constantly When either of the following conditions is met, the lights fade in: Any door is opened when all doors are closed. The engine switch is turned from off to on (IG). Illuminate for 15 seconds, and then fade out When any of the following conditions is met, the lights illuminate for 15 seconds and then fade out: Any door is unlocked when the engine switch is off, all doors are closed and all doors are locked. The engine switch is turned from on (IG) to off when all doors are closed. All doors are closed when any door is opened and the engine switch is off. Fade out immediately All doors are locked when the engine switch is off. Dim The engine switch is on (IG) and the shift lever is moved out of P.
3. INSPECT BATTERY SAVING CONTROL OPERATION NOTE: Perform this inspection with the customize parameters at the initial settings. The lights controlled by the battery saving control are as follows: Engine Switch Illumination Map Light Assembly (Front Dome Light, Front Map Light) Spot Light Assembly (Rear Dome Light, Rear Map Light) No. 1 Interior Illumination Light Assembly LH No. 1 Interior Illumination Light Assembly RH No. 1 Luggage Compartment Light Assembly Vanity Light Assembly LH Vanity Light Assembly RH Courtesy Light Assembly LH Courtesy Light Assembly RH Front Door Inside Handle Illumination Light Assembly LH Front Door Inside Handle Illumination Light Assembly RH The operations and conditions of this control are described below. Operation Condition Battery saving When 20 minutes elapse after the engine switch is turned from on (ACC or IG) to off and the lights that operate remain on, the lights are turned off. HINT: Battery saving control is canceled when any of the following operations is performed before the lights are turned off by the battery saving control. After the operation is performed, the lights remain on for another 20 minutes and then the lights are turned off. The engine switch is turned on (ACC or IG). Any door is opened and closed. The luggage compartment door is opened and closed. Any door is unlocked. The key enters any exterior actuation area.

DESCRIPTION

This circuit detects the engine switch on (IG) or off condition, and sends it to the main body ECU (multiplex network body ECU).

This circuit detects the engine switch on (ACC) or off condition, and sends it to the main body ECU (multiplex network body ECU).

Scheme 1

The main body ECU (multiplex network body ECU) detects the condition of the front door courtesy light switch assembly.

Scheme 2

The main body ECU (multiplex network body ECU) detects the condition of the rear door courtesy light switch assembly.

Scheme 3

The main body ECU (multiplex network body ECU) controls the operation of the following lights

1. Map Light Assembly (Front Dome Light)
2. Spot Light Assembly (Rear Dome Light)
3. No. 1 Interior Illumination Light Assembly LH
4. No. 1 Interior Illumination Light Assembly RH

When the battery saving control operates, the main body ECU (multiplex network body ECU) controls the operation of the DOME CUT relay that is built into the instrument panel junction block assembly to turn off the interior lights.

Scheme 4

The main body ECU (multiplex network body ECU) detects the condition of the door switch and front dome light switch.

Scheme 5

The main body ECU (multiplex network body ECU) controls the front door inside handle illumination lights.

Scheme 6

The illuminated entry system controls the engine switch illumination.

Scheme 7

The main body ECU (multiplex network body ECU) detects the condition of each door unlock detection switch.

Scheme 8

The main body ECU (multiplex network body ECU) detects the condition of the luggage compartment door courtesy switch that is built into the luggage compartment door lock assembly using this circuit.

Scheme 9

See also:
• DIAGNOSIS SYSTEM [04/2013 - ]
• REMOVAL [04/2013 - ]