LIGHTING (EXT): LIGHTING SYSTEM: PRECAUTION; 2018 - 2020 MY Sienna [11/2017

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM1000000018H83
Model Year Start: 2018	Model: Sienna	Prod Date Range: [11/2017 - ]
Title: LIGHTING (EXT): LIGHTING SYSTEM: PRECAUTION; 2018 - 2020 MY Sienna [11/2017 - ]

PRECAUTION

1. EXPRESSION OF IGNITION SWITCH

(a) The type of ignition switch used on this model differs according to the specifications of the vehicle.

The expressions listed in the table below are used in this section.

Expression	Ignition Switch (Position)	Engine Switch (Condition)
Ignition switch off	LOCK	Off
Ignition switch ON	ON	On (IG)
Ignition switch ACC	ACC	On (ACC)
Engine Start	START	Start

2. PRECAUTION FOR HEADLIGHT BULB REPLACEMENT

(a) If even a thin film of oil is left on the surface of an HID headlight bulb or a halogen bulb, its service life will be shortened because the light will burn at a higher temperature. When replacing a bulb, be sure to hold the flanged part of the light so that your hand does not contact the glass part of the bulb.

(b) Due to the high internal pressure of HID headlight bulbs, they may explode and shatter if dropped, hit or damaged.

(c) Always prepare a new bulb for immediate replacement. While replacing the bulb, the lens may attract dust and moisture if removed from the vehicle for a long time.

(d) Always replace a bulb with another bulb of the same wattage.

(e) If only replacing the bulb on one side, differences in brightness and lighting color between the right and left sides may occur.

(f) Securely install the socket after bulb replacement. The lens may become cloudy or the light cavity may be filled with water through gaps around the socket if it is not installed securely.

(g) Do not break the HID headlight bulb when disposing of it as shards of glass may fly off and cause injuries.

3. PRECAUTION FOR HID HEADLIGHT SYSTEM

(a) When the High Intensity Discharge (HID) headlight is illuminated or has recently been turned off, the light control ECU can be extremely hot, so be careful not to burn yourself.

(b) When any of the following defects are identified on the HID headlight, replace it with new one.

Deformation, cracks, dents, chipping, etc. on the light control ECU.
Deformation, cracks or chipping on the connector or high voltage socket.
Loose connection of reflector side ground circuit because of deformation of the socket cover.
Damaged wire harness for output.

(c) If the HID headlight illuminates normally but then flickers or shuts off, perform the inspection of HID headlight bulb (See page ).

(d) Even if the operation of the lights seems to be normal temporarily, the fail-safe function operates and illumination will be interrupted.

(e) Since an HID headlight bulb has pressurized gas inside and can easily be broken if scratched or dropped, special care should be taken. When handling the bulb, hold the plastic or metal part and do not touch the glass part with bare hands.

(f) When the HID headlights illuminate, a high voltage (approximately 30000 V) is applied momentarily to the bulb sockets. Never touch the bulb or socket with bare hand, and never connect a tester to the high voltage socket of an HID headlight for measurement, as this may result in a serious accident because of high voltage.

(g) When servicing an HID headlight, first confirm that the temperature of the light control ECU is adequately low and do not allow the HID headlight to come into contact with water. Turn off the light control switch and disconnect the cable from the negative (-) battery terminal and the connector of the light control ECU in advance to avoid electric shocks.

(h) When performing an operation related to an HID headlight, only operate it after assembly is complete. Never turn on the HID headlights without a bulb installed.

(i) Do not turn on the HID headlights using a power source other than the vehicle battery.

(j) The illumination color of the discharge bulb changes with time elapsed.

4. PRECAUTION FOR AUTOMATIC HIGH BEAM SYSTEM

(a) General Description

The automatic high beam system is a system that helps ensure visibility by automatically turning the high beam headlights on and off. Additionally, due to control limitations of the automatic high beam system, it may be necessary to manually turn the high beam headlights on and off. For safety reasons, make sure to turn the high beam headlights on and off manually according to the driving conditions.

(b) Conditions Unsuitable for Using Automatic High Beam System

Under the following conditions, the automatic high beam system might not detect other vehicles or lights correctly, or the high beam headlights might cause glare or flash pedestrians or the occupants of other vehicles. Manual operation should be considered.

Factor	Condition
Weather/Climate	When driving in bad weather (rain, snow, fog, sandstorms, etc.).
Front windshield	When the windshield glass is not clear (ice, snow or frost on the glass). When the windshield glass is dirty (sand, mud, water stains or bugs on the glass). When the windshield glass is cracked. When the windshield glass is fogged-up. When the windshield glass has a film attached. When an object on the instrument panel reflects off of the windshield glass. When any other abnormal conditions exist with the windshield glass.
Forward recognition camera	When the forward recognition camera is deformed. When the forward recognition camera is dirty. When any other abnormal conditions exist with the forward recognition camera.
Nearby vehicles or lights	When lights similar to headlights or taillights are in the vicinity of the vehicle. When a nearby vehicle has no lights or its lights are off. When a vehicle in front has misaligned lights, or its lights are changing color. When a vehicle in front has extremely dirty headlights or taillights.
Road conditions	When driving in areas where the conditions often change between bright and dark. When driving on hilly roads. When driving on winding roads or around sharp curves. When driving on bumpy roads (cobblestone paving, gravel roads, rough unpaved roads, etc.). When highly reflective objects are in front of the vehicle (mirrors, road signs, etc.).
Own vehicle	When the headlights are damaged, deformed or dirty. When the vehicle posture is abnormal (posture has changed due to the vehicle being fully loaded, a trailer being towed, road conditions, etc.). When the vehicle has other malfunctions or has been modified.
Automatic high beam system	Malfunction: When the automatic high beam indicator light on the combination meter assembly is off and "Check Headlight System" is displayed on the multi-information display. Others: When the automatic high beam system does not seem to be turning the high beam headlights on and off properly. When the automatic high beam system is frequently turning the high beam headlights on and off. When the glare from the high beam headlights would disturb pedestrians or the drivers of other vehicles.

5. PRECAUTIONS FOR FORWARD RECOGNITION CAMERA (w/ Automatic High Beam System)

(a) The automatic high beam system uses the forward recognition camera. For precautions related to the forward recognition camera, refer to Precaution for Forward Recognition Camera System.

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