Lighting (Diagnostics - Introduction): Other Lexus GS III facelift

PRECAUTION

Note. When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Intuitive Parking Assist System Refer to INITIALIZATION Theft Deterrent System Variable Gear Ratio Steering System

1. PRECAUTION OF HEADLIGHT BULB REPLACEMENT When any defect such as deformation, cracks, dents, chipping, etc. is identified on the discharge headlight (especially, on the light control ECU), replace it with a new one. Even if the operation seems to be normal, the fail-safe function may be defective. Since bulbs of the discharge headlight and halogen bulbs (for headlight and fog light) have 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. Never touch the high voltage socket of the discharge headlight with the headlight dimmer switch ON, as this could generate 20,000 V and lead to a serious accident. Never connect a tester to the high voltage socket of the discharge headlight for measurement, as this may lead to a serious accident because of high voltage. When performing operations related to the discharge headlight, keep it away from water such as rain, 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 shock. When performing operations related to the discharge headlight, operate it after assembling has been finished and never operate it without a bulb installed. Only illuminate the discharge headlight using the vehicle's power source.

Scheme 109

Scheme 110

Scheme 111

Scheme 112

Scheme 113

Scheme 114

Scheme 115

Scheme 116

Scheme 117

Scheme 118

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

CUSTOMIZE PARAMETERS

HINT

The followings are the possible items to be customized.

Note. After confirming whether the items of the customer's request is applicable or not for the customized items, perform the customize operation. Be sure to record the current value before customizing. In case of performing the troubleshooting, pay attention as there is a possibility that the function is OFF by customizing. (Example: In case of the symptom in which "The wireless operation does not function", check that the wireless operation is not OFF by customizing, then perform the troubleshooting.)

ILLUMINATED ENTRY

HINT

Sensitivity adjustment can hardly be confirmed. Check by driving the customer's vehicle.

LIGHT CONTROL

HINT

*:Except Canada

ILLUSTRATION *1 Lighting Brightness Setting DARK2 DARK1 NORMAL LIGHT1 LIGHT2

ILLUSTRATION *2 Brightness of lowering the lights Setting DARK2 DARK1 NORMAL LIGHT1 LIGHT2

ILLUSTRATION *3 Brightness when canceling the lowering of the lights Setting DARK2 DARK1 NORMAL LIGHT1 LIGHT2

Scheme 125

Scheme 126

1. Door linked personal light illumination control Mode 1: When door is opened, personal light of opened door illuminates Mode 2: When door is opened, both front personal lights and rear personal lights illuminate Mode 3: Front personal lights and rear personal lights are not linked to doors To change modes, press the map light assembly DOOR and ON switch simultaneously, and then turn the engine switch from off to on (IG). Each this operation will change the mode (Mode 1 --> Mode 2 --> Mode 3 --> Mode 1). HINT: After changing modes, the front personal lights respond by blinking as follows: Mode 1: once Mode 2: twice Mode 3: three times
2. Map light assembly ON switch linked illumination control Mode 4: When map light assembly ON switch is pressed, front personal lights, rear personal lights, front seat lights and rear seat lights illuminate Mode 5: When map light assembly ON switch is pressed, front seat lights and rear seat lights illuminate To change modes, press the map light assembly ON, DOOR and OFF switches simultaneously, and then turn the engine switch from off to on (IG). Each this operation will change the mode (Mode 4 --> Mode 5 --> Mode 4). HINT: After changing modes, the front personal lights responds by blinking as follows: Mode 4: four times Mode 5: five times

FAIL-SAFE CHART

1. FAIL-SAFE Light control ECU The light control ECU executes the fail-safe actions listed below in accordance with the item that has been detected. Item Outline Detection of Abnormal Input Voltage If voltage that is input to light control ECU deviates from operating voltage (9 to 16 V), ECU stops illuminating headlights, and resumes illuminating headlight once the voltage reverts to the operating voltage range However, if input voltage decreases after headlights have illuminated, headlight will remain illuminated until the bulbs are extinguished Detection of Abnormal Output (open or short circuit) or Flashing Bulb If abnormal condition (open or short circuit) occurs in voltage that is output by light control ECU, or if bulb flashes, ECU stops illuminating headlights and will maintain this state until power is reinstated (by turning headlight control switch from ON or OFF) Detection of Bulb Open If bulb is not inserted in its socket, ECU stops generating high voltage until bulb is inserted correctly and power is reinstated (by turning headlight control switch from OFF to ON or turning engine switch from off to on (IG)) Headlight beam level control system The headlight beam level control ECU operates in the fail-safe mode if an abnormal condition such as those listed below has been detected, and illuminates the automatic headlight leveling system warning light in the combination meter. Item Abnormality Detection Condition Description of Control Actuator Open or Short Holds beam at position of actuator when abnormality has been detected Height Control Sensor Signal Level Abnormality Returns beam to actuator's initial set position if abnormality has been detected higher than initial set position Holds beam at position of actuator when abnormality has been detected, if abnormality has been detected lower than initial set position Headlight Beam Level Control ECU When an abnormal processing of the CPU has been detected Holds the beam at position of actuator when abnormality has been detected Generator Signal When CHG- is low and vehicle speed is 0 km/h (0 mph) or more for 10 seconds Continue light control Vehicle Speed Signal When one side is 0 km/h (0 mph) and other side is more than 0 km/h (mph) Continue light control using normal vehicle speed signal