Automatic Headlights & Lighting: Other Lexus GS II рестайлинг

System Outline

When the light control switch is set at AUTO, the automatic light control system automatically turns on or off the taillights and headlights depending on the brightness around the vehicle.

DAYTIME RUNNING LIGHTS

When the engine is started, the generator signal is input from the body ECU No. 2 to terminal No. 5 of the daytime running light relay (main). See WIRING DIAGRAMS . At this time, when the parking brake pedal is depressed (the parking brake switch is on), the relay is not activated and the daytime running light system does not function. When the parking brake pedal is released (the parking brake switch is off), the signal is input to terminal No. 4 of the daytime running light relay (main). This activates the relay to turn on the DIMMER DRL NO. 2 relay. The current flows from the battery into the MAIN fuse (40-amp) to DRL NO. 2 fuse (30-amp) to DIMMER DRL NO. 2 relay (point side) to H-LP L UPR fuse (15-amp) to terminal No. 2 of the headlight LH (high) to terminal No. 1 to terminal No. 1 of the headlight RH (high) to terminal No. 2 to terminal No. 5 of the daytime running light relay No. 3 to terminal No. 3 to terminal No. 1 of the daytime running light resistor (USA) or short connector (Canada) to terminal No. 2 to GROUND. The headlights light up more dimly than usual as the engine is started.

Once the daytime running light system has been activated, the headlights remain lit even though the parking brake pedal is depressed (the parking brake switch is on). Even if the engine is stopped and the generator signal is cut off with the ignition switch set at ON, the headlights remain lit. When the ignition switch is turned from ON to OFF, the daytime running light system is stopped and the headlights go off. If the engine is started with the parking brake pedal released, the daytime running light system starts functioning and the headlights light up as the engine is started.

Light Control ECU

1. When input voltage is not within the range of operation voltage (9-16 volts), lighting of the headlight stops. As soon as the voltage comes within the range, it lights up again. However if the input voltage becomes low after lighting up, sufficient voltage is maintained until light of the bulb completely goes off.
2. When an error occurs in the output voltage (open or short) or flushing symptom occurs on the bulb, lighting of the headlight stops, the condition is maintained until power is turned ON again (headlight dimmer switch OFF to ON). In this case, it can not be judged whether lighting malfunction is caused by an output error or other reasons (fuse blown out, etc.). Check that there is no error in fuse and wiring (including power source) and replace the bulb in the first place, when the error still appears, replace the light control ECU. See «HEADLIGHT ASSEMBLY»(ref-152890-S36272465812003030400000) under REMOVAL & INSTALLATION.

1. Light Control Switch Set At HEAD - When the light control switch is set to the HEAD position, the signal is input to terminal No. 15 of the body ECU No. 2. See «WIRING DIAGRAMS»(ref-152890-S17699007262003030300000) . This activates the body ECU No. 2 and turns on the HEAD LP relay. When the signal is input to terminal No. 2 of the daytime running light relay (main), the daytime running light system deactivated and headlights LH and RH (high) go off. At this time, the current flows from the battery into the MAIN fuse (40-amp) to HEAD LP relay (point side) to H-LP L LWR and H-LP R LWR fuses (15-amp) to terminal No. 1 of the headlights LH and RH (low), except HID type, or terminal No. 1 (HID type) to GROUND, to turn on the headlights (low beam).
2. Light Control Switch Set At TAIL Or HEAD - When the light control switch is turned to the TAIL or HEAD position, the signal is input to connector B6 terminal No. 2 (TAIL) of the body ECU No. 2. This activates the body ECU No. 2 to flow the current from the battery into the ALT fuse (120-amp), TAIL relay (coil side), terminal No. 6 (TRLY) of the body ECU No. 2 to GROUND in that order to turn on the TAIL relay. The current flows from the TAIL fuse (10-amp) into the parking lights, front side marker lights, license plate lights, terminal No. 5 of the light failure sensor to terminal No. 7 and No. 12 to taillights, and rear side marker lights in that order to turn on each light.
3. Dimmer Switch Set At HIGH - When the light control switch is set to the HEAD position, the current flows into the daytime running light relay No. 3 and No. 4 (coil side) to turn on the relay as the headlights (low beam) light up. At this time, when the dimmer switch is set to the HIGH position, the signal is input to terminal No. 8 of the daytime running light relay (main). This activates the DIMMER DRL NO. 2 relay to flow the current from the battery into the MAIN fuse (40-amp) to DRL NO. 2 fuse (30-amp) to DIMMER DRL NO. 2 relay (point side) to headlights LH and RH (high) to daytime running light relay No. 4 (point side) to GROUND, to turn on the headlights (high or low) and high beam indicator at the same time.
4. Dimmer Switch Set At FLASH - When the dimmer switch is set to FLASH position, the current flows from the battery into the MAIN fuse (40-amp), the HEAD LP relay (coil side) to terminal No. 9 of the combination switch to terminal No. 17 to GROUND in that order to turn on the HEAD LP relay. Additionally, the signal is input to terminal No. 8 of the daytime running light relay (main) to activate the relay and turn on the DIMMER DRL NO. 2 relay. In the same manner as the dimmer switch is set at the HIGH position, the headlights (high and low) and high beam indicator light turned on at the same time.

ILLUMINATED ENTRY SYSTEM

This system provides various functions listed below through communication control of the body ECUs and door ECUs etc.

1. Each relevant light lights up if any door is opened.
2. If all the doors are closed with the ignition switch set at OFF after any door is opened, each light lights up for 15 seconds and then fades out when the time set on the timer has elapsed.
3. If any door is unlocked from the driver or passenger side or if any door is unlocked with the unlock switch on the transmitter after all the doors are closed and locked, each light lights up for 15 seconds and then fades out when the time set on the timer has elapsed.
4. If the ignition switch is turned to the ACC or ON position while each light is being lit by the timer, the timer lighting is cancelled and the light fades out.
5. If all the doors are closed and locked from the driver or passenger side or with the lock switch on the transmitter while each light is being lit, the timer lighting is cancelled and the light fades out.
6. If all the doors are closed with the ignition switch set at ACC or ON after any door is opened, the timer lighting is cancelled and the light fades out.
7. Each light above the interior light, ignition key cylinder light and step lights LH and RH.

This system automatically turns off the taillights and/or headlights when the driver door is opened and closed to prevent the lights from remaining lit.

When the light control switch is turned to the TAIL or HEAD position, the signal is input to connector B6 terminal No. 2 (TAIL) of the body ECU No. 2. This activates the body ECU No. 2 to flow the current from the battery into the ALT fuse (120-amp), TAIL relay (coil side), terminal No. 6 (TRLY) of the body ECU No. 2 to GROUND in that order to turn on the TAIL relay. The current flows from the TAIL fuse (10-amp) into the parking lights, front side marker lights, license plate lights, terminal No. 5 of the light failure sensor to terminal No. 7 and No. 12 to taillights, and rear side marker lights in that order to turn on each light.

Taillight Disconnection Warning

If any taillight wiring is faulty when the ignition switch is turned to the ON position with the light control switch set at TAIL or HEAD, the light failure sensor detects a voltage difference and inputs the signal to connector B6 terminal No. 4 (LF) of the body ECU No. 2. The body ECU No. 2 is activated to turn on the rear lights warning light in the combination meter to warn the driver.

HEADLIGHT AIM

1. Inspect the headlights aiming. Do the following items before inspection: Make sure the body around the headlight is not deformed. Park the vehicle on a level surface. Tire inflation pressure is at the specified value. The driver gets into the driver's seat and puts the vehicle in a state ready for driving (with a full tank). Bounce the vehicle several times.
2. Adjust the headlight aiming. (Scheme 17) Vertical Alignment - If the bubble is out of the acceptable range of the beam angle gauge, adjust it using bolt "A". (Scheme 18) Horizontal Alignment - If the edge of the lens does not match the 0 mark, adjust the lens using bolt "B". (Scheme 19)

Scheme 17

Scheme 18

Scheme 19

Auto On

1. Turn the ignition switch ON.
2. Turn the light control switch to AUTO.
3. Gradually cover the top of the sensor.
4. Check the accessory lights and the headlights should turn ON.

Auto Off

1. Gradually expose the sensor.
2. Check the headlights and the accessory lights should turn OFF.

AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT

1. Connector Disconnected Inspect the automatic light control sensor circuit. Disconnect the connector from the sensor and inspect the connector on the wire harness side. See «CONNECTOR IDENTIFICATION»(ref-152890-S12222230922003030300000) . See «INSPECTING AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT (DISCONNECTED)»(ref-152890-S10853903362003030400000) table. If the circuit is as specified, go to the next step. If the circuit is not as specified, inspect the circuit connected to other parts. See «WIRING DIAGRAMS»(ref-152890-S17699007262003030300000) . INSPECTING AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT (DISCONNECTED) Tester Connection Condition Specified Condition 3 - Ground Constant Continuity 1 - Ground Ignition Switch LOCK Or ACC No Voltage 1 - Ground Ignition Switch ON B+ Voltage 4 - Ground Ignition Switch LOCK Or ACC No Voltage 4 - Ground Ignition Switch ON 5.2 - 9.0 Volts
2. Connector Connected - Inspect the automatic light control sensor circuit. Connect the wire harness side connector to the sensor and inspect the wire harness side connector from the back side while the ignition switch is ON, the light control switch is AUTO and the vehicle's surroundings are bright. See «CONNECTOR IDENTIFICATION»(ref-152890-S12222230922003030300000) . See «INSPECTING AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT (CONNECTED)»(ref-152890-S38709448472003030400000) table. If the circuit is as specified, try replacing the sensor with a new one. If the circuit is not as specified, inspect the circuit connected to other parts. See «WIRING DIAGRAMS»(ref-152890-S17699007262003030300000) . INSPECTING AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT (CONNECTED) Tester Connection Condition Specified Condition 3 - Ground Constant Continuity 1 - Ground Ignition Switch LOCK Or ACC No Voltage 1 - Ground Ignition Switch ON 9.5 Volts Or More ..... Vehicle Is Under Direct Sun Light (Sensor Not Covered) Taillight & Headlight Are ON

DOOR COURTESY SWITCH CIRCUIT (FRONT)

For inspection of the front door courtesy switch circuit, see DOOR LOCK MOTOR CIRCUIT (FRONT) under CIRCUIT TESTS under POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT.

DOOR COURTESY SWITCH CIRCUIT (REAR)

For inspection of the rear door courtesy switch circuit, see DOOR LOCK MOTOR CIRCUIT (REAR) under CIRCUIT TESTS under POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT.

GLOVE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT

Disconnect the connector from the switch and inspect the connector on the wire harness side. See CONNECTOR IDENTIFICATION . See INSPECTING GLOVE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT table. If the circuit is not as specified, inspect the power source or wire harness. See WIRING DIAGRAMS .

INSPECTING GLOVE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT

GLOVE COMPARTMENT LIGHT CIRCUIT

Inspect the glove compartment light circuit. Disconnect the connector from the light and inspect the connector on the wire harness side. See CONNECTOR IDENTIFICATION . See INSPECTING GLOVE COMPARTMENT LIGHT CIRCUIT table. If the circuit is not as specified, inspect the power source or wire harness. See WIRING DIAGRAMS .

INSPECTING GLOVE COMPARTMENT LIGHT CIRCUIT

Scheme 20

1. Connector Disconnected - Inspect the headlight beam level control ECU circuit. Disconnect the connector from the ECU and inspect the connector on the wire harness side. See «CONNECTOR IDENTIFICATION»(ref-152890-S12222230922003030300000). See «INSPECTING HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT (DISCONNECTED)»(ref-152890-S17903679792003030400000) table. If the circuit is not as specified, go to the next step. INSPECTING HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT (DISCONNECTED) Tester Connection Condition Specified Condition A1 - A5 Ignition Switch OFF 26 - 30 Ohms A1 - A6 Ignition Switch OFF 26 - 30 Ohms A1 - A7 Ignition Switch OFF 26 - 30 Ohms A1 - A8 Ignition Switch OFF 26 - 30 Ohms A4 - B4 Ignition Switch ON & Light Control Switch HEAD Below 1.5 Volts B1 - B3 Ignition Switch OFF 3.5 - 6.5 Ohms B5 - B7 Ignition Switch OFF 3.5 - 6.5 Ohms A4 - Ground Ignition Switch OFF Continuity
2. Connector Connected Inspect the headlight beam level control ECU circuit. Connect the connector from the ECU and inspect the connector. See «CONNECTOR IDENTIFICATION»(ref-152890-S12222230922003030300000). See «INSPECTING HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT (CONNECTED)»(ref-152890-S31764215552003030400000) table. If the circuit is not as specified, replace the ECU. See «HEADLIGHT ASSEMBLY»(ref-152890-S36272465812003030400000) under REMOVAL & INSTALLATION. INSPECTING HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT (CONNECTED) Tester Connection Condition Specified Condition A1 - A4 Ignition Switch ON B+ Voltage A1 - A5 Ignition Switch ON, When Stopping & Bouncing The Vehicle Pulse Generation (1) A1 - A6 Ignition Switch ON, When Stopping & Bouncing The Vehicle Pulse Generation (1) A1 - A7 Ignition Switch ON, When Stopping & Bouncing The Vehicle Pulse Generation (1) A1 - A8 Ignition Switch ON, When Stopping & Bouncing The Vehicle Pulse Generation (1) B2 - B3 Ignition Switch ON Approx. 2.5 Volts B6 - B7 Ignition Switch ON Approx. 2.5 Volts B1 - B3, B5 - B7 Ignition Switch ON 5 Volts (1) Inspect using an oscilloscope. For correct waveform (Scheme 20)

LICENSE PLATE LIGHT CIRCUIT

Disconnect the connector from the light and inspect the connector on the wire harness side. See CONNECTOR IDENTIFICATION . See INSPECTING LICENSE PLATE LIGHT CIRCUIT table. If the circuit is not as specified, inspect the power source or wire harness. See WIRING DIAGRAMS .

INSPECTING LICENSE PLATE LIGHT CIRCUIT

LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT

Inspect the luggage compartment door courtesy switch circuit. See LUGGAGE COURTESY SWITCH CIRCUIT under CIRCUIT TESTS in BODY CONTROL SYSTEMS article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. Disconnect the connector from the switch and inspect the connector on the wire harness side. See CONNECTOR IDENTIFICATION . See INSPECTING LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT table. If the circuit is not as specified, inspect the power source or wire harness. See WIRING DIAGRAMS .

INSPECTING LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT

LUGGAGE COMPARTMENT LIGHT CIRCUIT

Disconnect the connector from the light and inspect the connector on the wire harness side. See CONNECTOR IDENTIFICATION . See INSPECTING LUGGAGE COMPARTMENT LIGHT CIRCUIT table. If the circuit is not as specified, inspect the power source or wire harness. See WIRING DIAGRAMS .

INSPECTING LUGGAGE COMPARTMENT LIGHT CIRCUIT

PERSONAL LIGHT SWITCH CIRCUIT (FRONT & REAR)

Inspect the front personal light switch circuit. See ILLUMINATION CIRCUIT under CIRCUIT TESTS in BODY CONTROL SYSTEMS article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. Disconnect the connector from the switch and inspect the connector on the wire harness side. See CONNECTOR IDENTIFICATION . See INSPECTING FRONT & REAR PERSONAL LIGHT & VANITY LIGHT SWITCH CIRCUIT table. If the circuit is not as specified, inspect the power source or wire harness. See WIRING DIAGRAMS .

INSPECTING FRONT & REAR PERSONAL LIGHT & VANITY LIGHT SWITCH CIRCUIT

VANITY LIGHT CIRCUIT

Inspect the vanity light circuit. Disconnect the connector from the light and inspect the connector on the wire harness side. See CONNECTOR IDENTIFICATION . See INSPECTING FRONT & REAR PERSONAL LIGHT & VANITY LIGHT SWITCH CIRCUIT table. If the circuit is not as specified, inspect the power source or wire harness. See WIRING DIAGRAMS .

DOOR COURTESY LIGHT

Using an ohmmeter, check that continuity exists between terminals. See CONNECTOR IDENTIFICATION . If continuity is not as specified, replace the light assembly or bulb.

DOOR COURTESY SWITCH (FRONT)

Inspect the door courtesy switch continuity. Connect the connector to the front door ECU. (Scheme 21) Check that continuity exists between terminals No. 1 and No. 2 when door is opened. Check that no continuity exists between terminals No. 1 and No. 2 when door is closed. If continuity is not as specified, replace the switch.

Scheme 21

DOOR COURTESY SWITCH (REAR)

Inspect the door courtesy switch continuity. Connect the connector to the rear door ECU. (Scheme 22) Check that continuity exists between terminals No. 1 and No. 2 when the door is opened. Check that no continuity exists between terminals No. 1 and No. 2 when the door is closed. If continuity is not as specified, replace the switch.

Scheme 22

GLOVE COMPARTMENT DOOR COURTESY SWITCH

Inspect the glove compartment door courtesy switch continuity. See CONNECTOR IDENTIFICATION . See INSPECTING GLOVE COMPARTMENT DOOR COURTESY SWITCH CONTINUITY table. If continuity is not as specified, replace the switch.

INSPECTING GLOVE COMPARTMENT DOOR COURTESY SWITCH CONTINUITY

GLOVE COMPARTMENT LIGHT

Using an ohmmeter, check that continuity exists between terminals. See CONNECTOR IDENTIFICATION . If continuity is not as specified, replace the light assembly or bulb.

HEADLIGHT BEAM LEVEL CONTROL ACTUATOR

Inspect the headlight beam level control actuator resistance. Check that continuity exists between terminals No. 2 and No. 5. See CONNECTOR IDENTIFICATION . Check that resistance exists between terminals as specified. See INSPECTING HEADLIGHT BEAM LEVEL CONTROL ACTUATOR RESISTANCE table. If the resistance value is not as specified, replace the actuator. See HEADLIGHT ASSEMBLY under REMOVAL & INSTALLATION.

INSPECTING HEADLIGHT BEAM LEVEL CONTROL ACTUATOR RESISTANCE

HEIGHT CONTROL SENSOR (FRONT)

Connect 3 dry batteries of 1.5 volts in series. (Scheme 23) Connect terminal No. 1 to the batteries' positive (+) terminal and terminal No. 4 to the batteries' negative (-) terminal, then apply voltage about 4.5 volts between terminals No. 1 and No. 4. Measure the voltage between terminals No. 2 and No. 4 when the height control sensor link is slowly moved up and down. See INSPECTING HEIGHT CONTROL SENSOR VOLTAGE table. If the voltage is not as specified, replace the height control sensor.

INSPECTING HEIGHT CONTROL SENSOR VOLTAGE

Scheme 23

HEIGHT CONTROL SENSOR (REAR)

Connect 3 dry batteries of 1.5 volts in series. (Scheme 24) Connect terminal No. 3 to the batteries' positive (+) terminal and terminal No. 1 to the batteries' negative (-) terminal, then apply voltage about 4.5 volts between terminals No. 1 and No. 3. Measure the voltage between terminals No. 1 and No. 2, when the height control sensor link is slowly moved up and down. See INSPECTING HEIGHT CONTROL SENSOR VOLTAGE table. If the voltage is not as specified, replace the height control sensor.

Scheme 24

LICENSE PLATE LIGHT

Using an ohmmeter, check that continuity exists between terminals. See CONNECTOR IDENTIFICATION . If continuity is not as specified, replace the light assembly or bulb.

LUGGAGE COMPARTMENT DOOR COURTESY SWITCH

Inspect the luggage compartment door courtesy switch continuity. See CONNECTOR IDENTIFICATION . See INSPECTING LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CONTINUITY table. If continuity is not as specified, replace the switch.

INSPECTING LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CONTINUITY

LUGGAGE COMPARTMENT LIGHT

Using an ohmmeter, check that continuity exists between terminals. See CONNECTOR IDENTIFICATION . If continuity is not as specified, replace the light assembly or bulb.

PERSONAL LIGHT SWITCH (FRONT)

Inspect the front personal light switch continuity. See CONNECTOR IDENTIFICATION . See and table. If continuity is not as specified, replace the light assembly or bulb.

INSPECTING FRONT PERSONAL LIGHT SWITCH CONTINUITY

PERSONAL LIGHT SWITCH (REAR)

Inspect the rear personal light switch continuity. See CONNECTOR IDENTIFICATION . See INSPECTING REAR PERSONAL LIGHT SWITCH CONTINUITY table. If continuity is not as specified, replace the light assembly or bulb.

INSPECTING REAR PERSONAL LIGHT SWITCH CONTINUITY

VANITY LIGHT

Inspect the vanity light continuity. See CONNECTOR IDENTIFICATION . See INSPECTING VANITY LIGHT CONTINUITY table. If continuity is not as specified, replace the vanity light assembly or bulb.

INSPECTING VANITY LIGHT CONTINUITY