Lighting (diagnostics - Introduction) Lexus IS F I

PRECAUTION

1. PRECAUTION FOR HEADLIGHT BULB REPLACEMENT If any defect such as deformation, cracks, dents, chipping, etc. is identified on a discharge headlight component (especially the light control ECU), replace it with a new one. Even if operation seems to be normal, the fail-safe function may be defective. Since discharge headlight and halogen bulbs (for headlights and fog lights) have pressurized gas inside and can easily be broken if scratched or dropped, special care should be taken. When handling the bulb, hold only the plastic or metal parts and do not touch the glass part with your bare hands. Never touch the high voltage socket of the discharge headlight with the headlight dimmer switch on, as this could generate 20000 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 headlights, keep components away from 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 an electric shock. When performing operations related to the discharge headlights, operate them after assembling all parts and never operate them without the bulbs installed. Only illuminate the discharge headlights using the vehicle's power source.

Scheme 148

Scheme 149

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

Scheme 155

Scheme 156

Scheme 157

Various switches or sensors are represented as inputs for the different systems mentioned in the illustrations above. Where direct electrical connections do not exist between components, signals may be carried across the different networks (BEAN, CAN) that exist on the vehicle. If a signal needs to travel from the CAN network to the BEAN network, the gateway ECU allows the signal to travel between these different networks. Some of these different signals can be confirmed or inspected using the Techstream.

Scheme 158

1. AUTOMATIC LIGHT CONTROL SYSTEM General When the light control switch is in the AUTO position, the automatic light control system detects ambient light levels and controls the headlights, parking lights, taillights, marker lights, and license plate lights.
2. MANUAL LIGHT CONTROL SYSTEM The function of the system is similar to the automatic light control system, except the system is controlled according to the driver's operations.
3. LIGHT AUTO TURN-OFF SYSTEM The light auto turn-off system is used to prevent forgetting to turn off the exterior lights (headlights, front fog lights, taillights, parking lights, license plate lights). This system has the following functions. Function Outline Driver Side Door-linked Function The exterior lights automatically turn off when all of the following conditions have been met: The engine switch is turned from on (IG) to off. The light control switch is in the TAIL position. The driver side door is opened. Delay Function The exterior lights automatically turn off 30 seconds after when all of the following conditions have been met: The engine switch is turned from on (IG) to off. The low beam headlights are on (Light control switch is in the HEAD or AUTO position). All doors are closed after any of the doors are opened. Door Control Transmitter-linked Function The exterior lights turn off immediately when the delay function is active and the following condition has been met: The lock button on the key is pushed after all doors are locked.
4. BI-FUNCTION The models with HID (High Intensity Discharge) headlights have a Bi-function. This Bi-function increases the upper illumination area of the discharge bulb (LO/HI beam) when the HI beam is turned on. If the LO beam is selected, the upper illumination area of the discharge bulb is blocked by a shade and only the lower illumination area is used. If the HI beam is selected, the headlight solenoid slides the shutter (shade) down to allow use of the upper illumination area, thus increasing the illumination area and improving visibility when the HI beam is on. This function is activated by the front controller. The front controller receives a HI beam turn ON signal from the main body ECU RH and activates the headlight solenoid built into the headlight unit to slide the shade down.
5. HID HEADLIGHT SYSTEM This system consists of the light control switch, windshield wiper switch assembly, main body ECU RH, HEAD LP relay, discharge bulbs, and light control ECUs. The main body ECU RH controls the low beam illumination using the HEAD LP relay. The BEAN network is used for communications. A HEAD backup link exists between the windshield wiper switch and the main body ECU RH. The light control ECUs transform the voltage that is input from the battery to a high voltage of up to 20000 V and apply this voltage to the discharge bulbs in order to illuminate them. A fail-safe function is provided as a countermeasure against high voltage generated in case a problem occurs in the headlight system. NOTE: For safety reasons, do not attempt to measure the voltage output from a light control ECU.
6. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM When the headlights are on, the automatic headlight beam level control system operates the headlight level actuators in accordance with the movement of the vehicle. The automatic headlight beam level control system mainly consists of the AFS ECU, front height control sensor, rear height control sensor, and two headlight level actuators. The AFS ECU controls the system. The ECU detects the movement of the suspension from the front and rear height control sensors, and the vehicle speed from the front RH and LH speed sensors. The ECU then controls the headlight level actuator based on this information, in order to change the headlight reflector angle. The AFS ECU controls both the level control system and the intelligent AFS system. Initial Set Control the AFS ECU executes the initial setting of the stepper motors at engine-start. Fail-Safe Function If the AFS ECU detects a malfunction in the automatic headlight beam level control system, the AFS ECU effects fail-safe control. At the same time, the AFS ECU flashes the AFS OFF indicator light in order to inform the driver of the problem.
7. INTELLIGENT AFS (ADAPTIVE FRONT-LIGHTING SYSTEM) An intelligent AFS (Adaptive Front-lighting System) is used in order to turn the LO/HI (discharge) beams in the direction the vehicle is turning. The separate (halogen) HI beam illumination is not controlled by this system. SWIVEL ANGLE RANGE Driving Condition Headlight Unit Left Right Right Turn 0° Fixed 0 to 5° to Right Left Turn 0 to 15° to Left 0° Fixed This system consists of the two headlight units for LO/HI beam (discharge illumination), the AFS ECU, two headlight swivel actuators, steering angle sensor and front speed sensors. The AFS ECU controls this system. The AFS ECU also controls the automatic headlight beam level control system. The system does not control the halogen HI beam illumination. The lights controlled by this system (LO/HI beam) are shown in the Front Lighting illustration. The AFS ECU performs intelligent AFS control when all the following conditions are fulfilled: Engine is running. Vehicle is moving* forward at 6 mph (10 km/h) or more, or stopped. Steering angle* is 7.5° or more. Headlight LO/HI beam operates. Daytime running light system is not operating. AFS ON/OFF condition is ON. *: Swivel angle change is in accordance with the vehicle speed and steering angle. The minimum vehicle speed to change the swivel is 6 mph (10 km/h) if the steering angle is wide. The minimum steering angle to change the swivel is 7.5° if the vehicle speed is high. The AFS ECU calculates the target lighting angle of the LO/HI beam based on the steering angle and the vehicle speed. Then, it actuates the headlight swivel actuators in order to attain the target lighting angle. The operation angle of the headlights is detected by the position (number of steps) of the stepper motor in the headlight swivel actuator.
8. DAYTIME RUNNING LIGHT SYSTEM The daytime running light system is designed to automatically illuminate the headlights (dimmed HI beams), during the daytime to make the car more visible to other vehicles. The main body ECU RH and front controller control this system. The main body ECU RH transmits a turn ON signal to the front controller, and the front controller illuminates the HI beams using a duty control. This system is enabled when the conditions given below are met: Engine switch on (IG) Engine speed signal input (engine running condition) Light control switch OFF, TAIL, or AUTO position (if headlight-on control is not being performed by the automatic light control) Parking brake switch: OFF HINT: The lights that are controlled are shown in the Front Lighting and Rear Lighting illustrations.
9. TURN SIGNALS The turn signals are front, rear and side lights that can be used to indicate a change of vehicle direction. The turn signal switch signals are received by the windshield wiper switch assembly (combination switch ECU). The main body ECU LH operates the turn signal flasher. The turn signal flasher operates the signal lights. HINT: The lights that are controlled are shown in the Front Lighting and Rear Lighting illustrations.
10. HEADLIGHT CLEANER SYSTEM Some vehicles are provided with a headlight cleaner system. More details on the headlight cleaner system operation can be found in the wiper information. Refer to «WIPER / WASHER (SERVICE INFORMATION)»(/lexus/is-f/i-2007-2014/remont/wiperwasher-systems/#wiper-washer-service-information) .

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use the following procedure to troubleshoot the lighting system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK NEXT: Go to next step
3. INSPECT BATTERY VOLTAGE Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
4. INSPECT MULTIPLEX COMMUNICATION SYSTEM (BEAN)* Use the Techstream to check if the Multiplex Communication System (MPX) is functioning normally. Result Result Proceed to MPX DTC is not output A MPX DTC is output B B --> Go to step 8 A: Go to next step
5. CHECK FOR DTC* Result Result Proceed to DTC is not output A DTC is output B B --> Go to step 8 A: Go to next step
6. PROBLEM SYMPTOMS TABLE Result Result Proceed to If fault is not listed in problem symptoms table A If fault is listed in problem symptoms table B B --> Go to step 8 A: Go to next step
7. OVERALL ANALYSIS AND TROUBLESHOOTING* Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(/lexus/is-f/i-2007-2014/remont/exterior-lights/#lighting-diagnostics-introduction__data-list-active-test) Terminals of ECU. Refer to «TERMINALS OF ECU»(/lexus/is-f/i-2007-2014/remont/exterior-lights/#lighting-diagnostics-introduction) Inspection NEXT: Go to next step
8. ADJUST, REPAIR OR REPLACE NEXT: Go to next step
9. CONFIRMATION TEST NEXT --> END

OPERATION CHECK

1. LIGHT AUTO TURN-OFF OPERATION CHECK When only the taillights are on. Close the driver side door. Turn the engine switch on (IG). Turn the light control switch to the TAIL position. Turn the engine switch off. Open the driver side door. Check that the taillights go off immediately. When low beam headlights are on. Close all of the doors. Turn the engine switch on (IG). Turn the low beam headlights, high beam headlights, or front fog lights on. Turn the engine switch off. Open any of a door. Close all of the doors. Check that all of lights go off after 30 seconds (delay function). HINT: Before the lights go off, if the lock button on the key is pushed after all of the doors are locked, all of lights will go off immediately.
2. AUTOMATIC LIGHT CONTROL OPERATION CHECK Turn the engine switch on (IG). Turn the light control switch to the AUTO position. Cover the automatic light control sensor. Check that the taillights and low beam headlights come on. Uncover the automatic light control sensor. Check that the low beam headlights and taillights go off.
3. DAYTIME RUNNING LIGHT OPERATION CHECK Turn the light control switch off. Start the engine. Release the parking brake. Check that the daytime running lights (dimmed high beam headlights) come on.
4. AFS OPERATION CHECK Check that the initialization (determination of the initial position) of the leveling motor and swivel motor is performed after the engine is started.
5. LIGHT CONTROL ECU OPERATION CHECK Perform the following illumination diagnosis when both of the following conditions are met: 1) the light control ECU is not visibly damaged, and 2) the light control ECU has been struck but is operating normally. If all of the following diagnosis results are normal, the light control ECU can be reused. Perform low beam headlight cold starts (10 minutes or more off, then turned on) and hot starts (15 minutes or more on, 1 minute off, then turned on again) several times. Check that the low beam headlights illuminate normally. For 5 minutes immediately after a light cold start (before the lights stabilize), visually check the illumination condition and check that the lights do not flicker or show signs of instability. Install bulbs that have approximately the same usage time, and illuminate the low beam headlights for approximately 30 seconds. Check that the brightness of the left and right bulbs are approximately the same, and that the illumination is stable.

CUSTOMIZE PARAMETERS

HINT

The following items can be customized.

Note. Before attempting to customize vehicle settings, confirm whether it is possible to make the change that the customer has requested. Be sure to record the current value before customizing. Before troubleshooting the lighting system, pay attention because there is a possibility that a function has been disabled by customizing. If the wireless operation does not function, check that the wireless operation has not been disabled by customizing, then perform troubleshooting.

ILLUMINATED ENTRY

LIGHT CONTROL

HINT

The sensitivity adjustment may be difficult to confirm. Check by driving the customer's vehicle.

PROBLEM SYMPTOMS TABLE

HINT

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

HEADLIGHT SYSTEM

DAYTIME RUNNING LIGHT SYSTEM

TAILLIGHT SYSTEM

SIDE MARKER SYSTEM

STOP LIGHT SYSTEM

FRONT FOG LIGHT SYSTEM

TURN SIGNAL LIGHT SYSTEM

BACK-UP LIGHT SYSTEM

LICENSE PLATE LIGHT SYSTEM

DOOR MIRROR FOOT LIGHT SYSTEM

AFS

HINT

1. *1: When the AFS indicator light does not come on or blink despite the symptom being occurring, check the battery voltage.
2. *2: Check if the headlight swivel motor turns smoothly by hand. If the motor does not turn, replace it with a new one. If the motor still does not turn, replace the headlight assembly with a new one.
3. *3: Before beginning diagnosis, check that the AFS setting is ON.

Scheme 159

Scheme 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

Scheme 165

Scheme 166

1. CHECK FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU) Terminal No. Wiring Color Terminal Description Condition Specified Condition 2E-1 - Body ground W - Body ground Power source circuit Always 11 to 14 V 2E-2 - Body ground W-L - Body ground Power source circuit Always 11 to 14 V 2E-3 - Body ground B-Y - Body ground Engine switch signal circuit Engine switch on (IG) 11 to 14 V 2E-3 - Body ground B-Y - Body ground Engine switch signal circuit Engine switch off Below 1 V 2E-4 - Body ground G-R - Body ground Power source circuit Always 11 to 14 V 2F-1 - Body ground W-B - Body ground Ground Always Below 1 V 2F-5 - Body ground L - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform 2F-6 - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform 2G-6 - Body ground LG - Body ground Fog light circuit (To front fog light RH) Front fog light ON 11 to 14 V 2G-6 - Body ground LG - Body ground Fog light circuit (To front fog light RH) Front fog light OFF Below 1 V 2G-7 - Body ground G-R - Body ground Fog light circuit (To front fog light LH) Front fog light ON 11 to 14 V 2G-7 - Body ground G-R - Body ground Fog light circuit (To front fog light LH) Front fog light OFF Below 1 V 2G-8 - Body ground G - Body ground Taillight circuit (To parking light RH) Light control switch in TAIL 11 to 14 V 2G-8 - Body ground G - Body ground Taillight circuit (To parking light RH) Light control switch OFF Below 1 V 2G-9 - Body ground L - Body ground Taillight circuit (To parking light LH) Light control switch in TAIL 11 to 14 V 2G-9 - Body ground L - Body ground Taillight circuit (To parking light LH) Light control switch OFF Below 1 V 2G-12 - Body ground R-W - Body ground Hi-beam circuit (To headlight RH) Headlight dimmer switch in HI 11 to 14 V 2G-12 - Body ground R-W - Body ground Hi-beam circuit (To headlight RH) Headlight dimmer switch in HEAD Below 1 V 2G-13 - Body ground R-Y - Body ground Hi-beam circuit (To headlight LH) Headlight dimmer switch in HI 11 to 14 V 2G-13 - Body ground R-Y - Body ground Hi-beam circuit (To headlight LH) Headlight dimmer switch in HEAD Below 1 V 2G-4 - Body ground R-L - Body ground Hi-beam circuit Headlight dimmer switch in HI 11 to 14 V 2G-4 - Body ground R-L - Body ground Hi-beam circuit Headlight dimmer switch in HEAD Below 1 V 2G-10 - Body ground G-Y - Body ground Taillight circuit (To marker light RH) Light control switch in TAIL 11 to 14 V 2G-10 - Body ground G-Y - Body ground Taillight circuit (To marker light RH) Light control switch OFF Below 1 V 2G-11 - Body ground BR - Body ground Taillight circuit (To marker light LH) Light control switch in TAIL 11 to 14 V 2G-11 - Body ground BR - Body ground Taillight circuit (To marker light LH) Light control switch OFF Below 1 V
2. CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition RD-7 (GND2) - Body ground W-B - Body ground Ground Always Below 1 V RA-20 (MPX1) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform RK-5 (BECU) - Body ground G-R - Body ground Multiplex communication power source circuit Always 11 to 14 V RL-7 (HRLY) - Body ground R-W - Body ground HEAD signal (To HEAD relay) Light control switch OFF or in TAIL 11 to 14 V RL-7 (HRLY) - Body ground R-W - Body ground HEAD signal (To HEAD relay) Light control switch in HEAD Below 1 V J75-21 (MPX2) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform J74-4 (CLTE) - Body ground W - Body ground Automatic light control sensor ground circuit Always Below 1 V J74-5 (CLTS) - Body ground R - Body ground Automatic light control sensor ground circuit Engine switch off Below 1 V J74-5 (CLTS) - Body ground R - Body ground Automatic light control sensor ground circuit Engine switch on (IG), lights control switch in AUTO, headlights come ON Signal waveform J74-6 (CLTB) - Body ground GR - Body ground Automatic light control sensor power source circuit Engine switch off Below 1 V J74-6 (CLTB) - Body ground GR - Body ground Automatic light control sensor power source circuit Engine switch on (IG) 11 to 14 V J74-23 (HEAD) - Body ground L - Body ground HEAD signal (From light control switch) Light control switch OFF or in TAIL 11 to 14 V J74-23 (HEAD) - Body ground L - Body ground HEAD signal (From light control switch) Light control switch in HEAD Below 1 V RA-15 (ALTB) - Body ground SB - Body ground Power source circuit Always 11 to 14 V RD-1 (TRLY) - Body ground Y - Body ground HEAD signal (to HEAD relay) Light control switch OFF 11 to 14 V RD-1 (TRLY) - Body ground Y - Body ground HEAD signal (to HEAD relay) Light control switch in TAIL Below 1 V J74-2 (HAZ) - Body ground Y - Body ground Hazard signal (From hazard switch) Hazard switch ON Below 1 V J74-2 (HAZ) - Body ground Y - Body ground Hazard signal (From hazard switch) Hazard switch OFF 11 to 14 V
3. CHECK MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition LD-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 V LA-15 (TR) - Body ground P - Body ground RH side turn signal (To turn signal flasher assembly) Engine switch off Below 1 V LA-15 (TR) - Body ground P - Body ground RH side turn signal (To turn signal flasher assembly) Engine switch on (IG) and turn signal switch (right turn) off 11 to 14 V LA-16 (TL) - Body ground BR - Body ground LH side turn signal (To turn signal flasher assembly) Engine switch off Below 1 V LA-16 (TL) - Body ground BR - Body ground LH side turn signal (To turn signal flasher assembly) Engine switch on (IG) and turn signal switch (left turn) off 11 to 14 V LD-8 (SGND) - Body ground W-B - Body ground Ground Always Below 1 V LD-9 (SGND) - Body ground W-B - Body ground Ground Always Below 1 V LD-18 (MPXB) - Body ground LG - Body ground Multiplex communication power source circuit Always 11 to 14 V Q3-15 (MPX1) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform A30-17 (MPX2) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
4. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition J26-1 (B) - J26-5 (E) LG - W-B Power source circuit (From battery) Always 11 to 14 V J26-2 (IG) - J26-5 (E) B - W-B Engine switch signal circuit (From engine switch) Engine switch off Below 1 V J26-2 (IG) - J26-5 (E) B - W-B Engine switch signal circuit (From engine switch) Engine switch on (IG) 11 to 14 V J26-4 (HEAD) - Body ground L - Body ground Light control switch HEAD signal Light control switch not in HEAD 11 to 14 V J26-4 (HEAD) - Body ground L - Body ground Light control switch HEAD signal Light control switch in HEAD Below 1 V J26-5 (E) - Body ground W-B - Body ground Ground Always Below 1 V J26-6 (MPX1) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform J26-7 (MPX2) - Body ground GR - Body ground Multiplex communication signal circuit Engine switch on (IG) Signal waveform
5. CHECK AFS ECU Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A28-1 (SBF) - A28-17 (SGF) R-B - G-R Vehicle height signal (To height control sensor) Engine switch off Below 1 V Engine switch on (IG) 4.5 to 5.5 V A28-6 (SPDL) - A27-1 (E1) R-L - W-B Vehicle speed signal (To skid control ECU) Vehicle is driving at approx. 30 km/h (19 mph) Pulse generation (see waveform 1) A28-7 (SPDR) - A27-1 (E1) G-W - W-B Vehicle speed signal (To skid control ECU) Vehicle is driving at approx. 30 km/h (19 mph) Pulse generation (see waveform 1) A28-9 (BR1+) - A28-10 (BR1-) LG-R - B Headlight swivel motor RH Engine switch off Below 1 V Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel to right more than 7.5° Pulse generation (see waveform 2) A28-11 (BR2+) - A28-12 (BR2-) L-B - L-Y Headlight swivel motor RH Engine switch off Below 1 V Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel more than 7.5° Pulse generation (see waveform 2) A28-13 (LR1+) - A28-14 (LR1-) L - BR-W Headlight leveling actuator RH Engine switch off Below 1 V Engine running, light control switch in HEAD, the vehicle is standing still or bouncing Pulse generation (see waveform 3) A28-15 (LR2+) - A28-16 (LR2-) P - LG Headlight leveling actuator RH Engine switch off Below 1 V Engine running, light control switch in HEAD, the vehicle is standing still or bouncing Pulse generation (see waveform 3) A28-17 (SGF) - A27-1 (E1) G-R - W-B Vehicle height signal (To height control sensor) Always Below 1 V A28-18 (SMGR) - A27-1 (E1) W-R - W-B Headlight swivel motor RH Always Below 1 V A28-19 (SMGL) - A27-1 (E1) P-G - W-B Headlight swivel motor LH Always Below 1 V A28-21 (SMBR) - A28-18 (SMGR) GR - W-R Headlight swivel motor RH Engine switch off Below 1 V Engine switch on (IG) 4.5 to 5.5 V A28-22 (SMBL) - A28-19 (SMGL) W - P-G Headlight swivel motor LH Engine switch off Below 1 V Engine switch on (IG) 4.5 to 5.5 V A28-23 (SMR) - A28-18 (SMGR) G-B - W-R Headlight swivel motor RH Engine switch off Below 1 V Engine switch on (IG) 0.3 to 4.6 V A28-24 (SML) - A28-19 (SMGL) Y-B - P-G Headlight swivel motor LH Engine switch off Below 1 V Engine switch on (IG) 0.3 V to 4.6V A28-25 (BL1+) - A28-26 (BL1-) B-L - L-W Headlight swivel motor LH Engine switch off Below 1 V Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel to left more than 7.5° Pulse generation (see waveform 2) A28-27 (BL2+) - A28-28 (BL2-) L-R - B-Y Headlight swivel motor LH Engine switch off Below 1 V Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel to left more than 7.5° Pulse generation (see waveform 2) A28-29 (LL1+) - A28-30 (LL1-) R-G - G Headlight leveling actuator LH Engine switch off Below 1 V Engine running, light control switch in HEAD, the vehicle is standing still or bouncing Pulse generation (see waveform 3) A28-31 (LL2+) - A28-32 (LL2-) Y-R - V-R Headlight leveling actuator LH Engine switch off Below 1 V Engine running, light control switch in HEAD, the vehicle is standing still or bouncing Pulse generation (see waveform 3) A27-1 (E1) - Body ground W-B - Body ground Ground Always Below 1 V A27-2 (IG) - A27-1 (E1) B-O - W-B Power source circuit (To engine switch) Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V A27-5 (MPX1) - A27-1 (E1) BR-R - W-B Multiplex communication signal Engine switch on (IG) Signal waveform A27-6 (MPX2) - A27-1 (E1) BR - W-B Multiplex communication signal Engine switch on (IG) Signal waveform A27-7 (SS+) - A27-8 (SS-) L - LG-B Steering sensor signal (To position sensor) Engine idling, slowly turn steering wheel Pulse generation A27-9 (SHRL) - A27-20 (SGR) B-W - R-Y Vehicle height signal (To height control sensor rear) Engine switch off Below 1 V Engine switch on (IG) , bouncing the vehicle 0.5 to 4.5 V A28-2 (SHFL) - A28-17 (SGF) G-Y - G-R Vehicle height signal (To height control sensor front) Engine switch off Below 1 V Engine switch on (IG) , bouncing the vehicle 0.5 to 4.5 V A27-10 (SBR) - A27-20 (SGR) W - R-Y Vehicle height signal (To height control sensor rear) Engine switch off Below 1 V Engine switch on (IG) 4.5 to 5.5 V Waveform 1 Item Contents Terminal SPDL - GND SPDR - GND Tool setting 5 V/DIV., 2 ms./DIV. Vehicle condition Vehicle is driving at approximately 30 km/h (19 mph) Waveform 2 Item Contents Terminal BL1+ - BL1- BL2+ - BL2- BR1+ - BR1- BR2+ - BR2- Tool setting 10 V/DIV., 5 ms./DIV. Vehicle condition Engine running, light control switch in HEAD, driving at more than 10 km/h (6 mph) and turning the steering wheel more than 7.5° If the value is not within the standard range, it is possible there is some malfunction on the vehicle side. Inspect the fuse, wire harness and connector. Waveform 3 Item Contents Terminal LR1+ - LR1- LR2+ - LR2- LL1+ - LL1- LL2+ - LL2- Tool setting 10 V/DIV., 5 ms./DIV. Vehicle condition Engine running, light control switch in HEAD, the vehicle is standing still or bouncing. If the value is not within the standard range, it is possible there is some malfunction on the vehicle side. Inspect the fuse, wire harness and connector.

DIAGNOSIS SYSTEM

1. DESCRIPTION Lighting system data and the Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and to repair.
2. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION»(/lexus/is-f/i-2007-2014/remont/hoistjack/#introduction) .
3. INSPECT BATTERY VOLTAGE Standard 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding.

DTC CHECK / CLEAR

1. CHECK DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Read the DTCs by following the directions on the Techstream screen. HINT: Refer to the Techstream operator's manual for further details.
2. CLEAR DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Clear the DTCs by following the directions on the Techstream screen. HINT: Refer to the Techstream operator's manual for further details.

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 the light control ECU deviates from the operating voltage range (9 to 16 V), the ECU stops illuminating the headlights, and resumes illuminating the headlights once the voltage reverts to the operating voltage range However, if input voltage decreases after the headlights have illuminated, the headlights will remain illuminated as long as possible Detection of Abnormal Output (open or short circuit) or Flashing Bulb If an abnormal condition (open or short circuit) occurs in voltage that is output by the light control ECU, or if the bulb flashes, the ECU stops illuminating the headlights and will maintain this state until power is reinstated (by turning the headlight control switch off and then on again) Detection of Bulb Open If a bulb is not inserted in its socket, the ECU stops generating high voltage until the bulb is inserted correctly and power is reinstated (by turning the headlight control switch off and then on again or turning the engine switch off and then on (IG) again) AFS ECU HINT: If a malfunction is detected, the headlight swivel ECU assembly (AFS ECU) performs fail-safe operation. Depending on the malfunction, the ECU flashes at 1 Hz intervals or illuminates the AFS OFF indicator in the combination meter assembly. Warning massages are also shown on the multi-information display. Item Detection Condition Leveling Motor Control Swivel Motor Control Operation Restore Condition Indicator Swivel motor (motor) Open Short Overheat Continues with the right and left leveling motor positions lowered by 0.8° from the current position. The normal swivel motor returns to the front position. The abnormal swivel motor stops at the current position. IG ON cycled Blinks Gear malfunction IG ON cycled Position change is detected Stop position error IG ON cycled Normal stop position is detected Swivel motor (sensor) Open Short Continues Returns to the front position. IG ON cycled Normal stop position is detected Blinks Steering angle sensor Trouble information is received Communication error Continues with the right and left leveling motors lowered by 0.8° from the current position. Continues after the swivel motor returns to the front position. Stops at the current position and then returns to the front position. IG ON cycled Normal value is detected Blinks Speed sensor Open Short Continues using the normal vehicle speed signal that is supplied by the skid control ECU if one sensor is malfunctioning. Continues determining that the vehicle is stationary if both sensors are malfunctioning. If one sensor is malfunctioning, the swivel motor is controlled using the normal vehicle speed signal that is supplied by the skid control ECU, and the motor returns to the front position. If both sensors are malfunctioning, the motor returns to the front position. IG ON cycled Blinks Height control sensor Open Short Pitch angle error Power source trouble If the leveling motor position is higher than the initial position, the leveling motor is returned to the initial position. If the leveling motor position is lower than its initial position, the leveling motor stays at the current position. Returns to the front position. IG ON cycled Normal value is detected Blinks Leveling motor Open Short Overheat The abnormal leveling motor stops at the current position. The normal leveling motor returns to its initial position if its current position is higher than the initial position. The normal leveling motor will stop at the current position if this position is lower than the initial position. Returns to the front position. IG ON cycled Blinks BEAN communication Interruption of headlight signal communication Interruption of headlight signal from the windshield wiper switch assembly Interruption of steering sensor zero-point signal Interruption of front wheel speed signal communication Continues Returns to the front position. Signal is no longer interrupted. Blinks Interruption of AFS OFF switch signal Illuminates Interruption of engine speed signal communication Interruption of vehicle speed signal communication Continues Blinks AFS ECU ECU internal malfunction Continues Continues IG ON cycled Goes off Wheel speed data error Abnormal front wheel speed signal is received from the skid control ECU Continues Returns to the front position. Normal signal is received. Blinks

DATA LIST / ACTIVE TEST

1. READ DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / (desired system) / Data List. Read the Data List according to the display on the Techstream. COMBINATION SWITCH (WINDSHIELD WIPER SWITCH ASSEMBLY) Tester Display Measurement Item/Range Normal Condition Diagnostic Note Front Fog Light Switch Front fog light switch signal / ON or OFF ON: Front fog light switch is in ON position OFF: Front fog light switch is not in ON position - Passing Light Switch Passing light switch signal / ON or OFF ON: Headlight dimmer switch is in FLASH position OFF: Headlight dimmer switch is not in FLASH position - Dimmer Hi Switch High beam switch signal / ON or OFF ON: Headlight dimmer switch is in HI position OFF: Headlight dimmer switch is not in HI position - Light Auto Switch Auto light switch signal / ON or OFF ON: Light control switch is in AUTO position OFF: Light control switch is not in AUTO position - Head Light Switch Light control switch HEAD signal / ON or OFF ON: Light control switch is in HEAD position OFF: Light control switch is not in HEAD position - Tail Light Switch Taillight switch signal / ON or OFF ON: Light control switch is in TAIL or HEAD position OFF: Light control switch is off - Turn Left Switch Turn signal switch LH signal / ON or OFF ON: Light control switch is in LH position OFF: Light control switch is not in LH position - Turn Right Switch Turn signal switch RH signal / ON or OFF ON: Light control switch is in RH position OFF: Light control switch is not in RH position - Ignition Switch Signal Engine switch signal / ON or OFF ON: Engine switch on (IG) OFF: Engine switch off - BODY (MAIN BODY ECU RH) Tester Display Measurement Item/Range Normal Condition Diagnostic Note ACC SW Engine switch / ON (ACC) or OFF ON: Engine switch on (ACC or IG) OFF: Engine switch off - IG SW Engine switch / ON (IG) or OFF ON: Engine switch on (IG) OFF: Engine switch off - Luggage Courtesy SW Luggage door courtesy switch / ON or OFF ON: Luggage door is open OFF: Luggage door is closed D Door Courtesy SW Driver side courtesy switch / ON or OFF ON: Driver side door is open OFF: Driver side door is closed - P Door Courtesy SW Passenger side courtesy switch / ON or OFF ON: Passenger side door is open OFF: Passenger side door is closed - Rear Door Courtesy SW Rear (LH or RH) courtesy switch / ON or OFF ON: Rear door (LH or RH) is open OFF: Rear door (LH and RH) is closed - Head Light SW (Head) Light control switch HEAD signal / ON or OFF ON: Light control switch is in HEAD position OFF: Light control switch is not in HEAD position - Illumination Rate Info Illumination information / 0 to 99.99 ms 0.8 to 22 ms - BODY NO. 3 (MAIN BODY ECU LH) Tester Display Measurement Item/Range Normal Condition Diagnostic Note Exterior Foot Light Lighting Time Door mirror foot light lighting time /30 sec., 15 sec. or 7.5 sec. Customized value will be displayed - Exterior Foot Light Control Door mirror foot light control AVAIL or NOT AVL Customized value will be displayed - IG SW Engine switch / ON or OFF ON: Engine switch on (IG) OFF: Engine switch off - AFS (AFS ECU) Tester Display Measurement Item/Range Normal Condition Diagnostic Note AFS OFF Switch ASF OFF switch / ON or OFF ON: AFS OFF OFF: AFS ON - Headlamp Signal Headlight signal / ON or OFF ON: Light control switch is in HEAD position OFF: Light control switch is not in HEAD position - Headlamp Combi Switch Light control switch signal / ON or OFF ON: Light control switch is in HEAD position OFF: Light control switch is not in HEAD position - Headlamp Auto Signal Headlight signal / ON or OFF ON: Automatic light control system is operated (headlight comes on) OFF: Automatic light control system is stopped - +B Battery voltage value / 0 to 20 V Condition sign can be displayed - Height Sens PW Supply Val Height sensor power supply value / 0 to 5 V Approx. 5 V - Fr Height Sens Signal Val Front height sensor signal value / 0 to 5 V Approx. 2.5 V - Rr Height Sens Signal Val Rear height sensor signal value / 0 to 5 V Approx. 2.5 V - Steering Sens Signal Steering sensor signal / -384° to 382.5° Approx. 0 ° (When steering wheel is straight) - Steering Sens Center Pos Steering sensor center position / -3072° to 3070.5° Condition sign can be displayed - L Swivel Motor Pos Sens Val Left swivel motor position sensor value / 0 to 5 V Condition sign can be displayed - R Swivel Motor Pos Sens Val Right swivel motor position sensor value / 0 to 5 V Condition sign can be displayed - Number Of Trouble Codes Number Of Trouble Codes / 0 to 255 Condition sign can be displayed
2. PERFORM ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in trouble shooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / (desired system) / Active Test. Perform the Active Test according to the display on the Techstream. BODY (MAIN BODY ECU RH) Tester Display Test Part Control Range Diagnostic Note Headlight Relay Headlight relay ON/OFF - Taillight Relay Tail light relay ON/OFF - BODY NO. 3 (MAIN BODY ECU LH) Tester Display Test Part Control Range Diagnostic Note Turn Light RH Turn signal light RH ON/OFF - Turn Light LH Turn signal light LH ON/OFF - Exterior Foot Light Operation Door mirror foot lights ON/OFF - BODY NO. 5 (FRONT CONTROLLER) Tester Display Test Part Control Range Diagnostic Note Light Head (High) Headlight (High) ON/OFF - Front Fog Light Relay Front fog light relay ON/OFF - Light Head HI DRL Operation Dimmed HI beams ON/OFF - Clearance Light Operation Parking light ON/OFF - AFS (AFS ECU) Tester Display Test Part Control Range Diagnostic Note Drive The Leveling Motor Leveling motor upward operation UP/OFF - Drive The Leveling Motor Leveling motor downward operation DOWN/OFF - Drive Swivel Motor RH Swivel motor RH right direction rotation RIGHT/OFF - Drive Swivel Motor LH Swivel motor LH left direction rotation LEFT/OFF - AFS OFF Indicator AFS OFF indicator ON/OFF

DIAGNOSTIC TROUBLE CODE CHART

LIGHTING SYSTEM

See also:
• WIPER / WASHER (SERVICE INFORMATION)
• COMPONENTS
• Headlight Relay Circuit
• INSPECTION
• ON-VEHICLE INSPECTION
• INSPECTION
• COMPONENTS
• Interior Light Switch Signal Circuit
• COMPONENTS
• COMPONENTS
• GENERAL INFORMATION
• DATA LIST / ACTIVE TEST
• TERMINALS OF ECU