Lighting System - Diagnosis: Overview Lexus LS III рестайлинг

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1. PRECAUTION FOR DISCONNECTING THE BATTERY CABLE NOTE: When disconnecting the negative (-) battery terminal, initialize the following system after the terminal is reconnected.
2. PRECAUTION FOR HEADLAMP BULB REPLACEMENT When any defects such as deformation, crack, dent, chipping, etc. are identified on the HID headlamp (especially, on the light control ECU), replace it with a new one. Even if operation seems to be normal, the fail-safe function may be defective. Be careful not to scratch or drop HID headlamp bulbs or halogen bulbs (for high beam headlamps and fog lights) as they have pressurized gas inside and can be easily broken. Touching the high voltage socket of the HID headlamp with the headlamp dimmer switch ON could generate momentary high voltage of 20,000 V and lead to a serious injury. Never connect a tester to the high voltage socket of the HID headlamp for measurement, as this may lead to a serious injury due to high voltage. To avoid electric shock, when servicing the HID headlamp, keep it away from water and rain, turn off the light control switch, and disconnect the battery terminal and the connector of the light control ECU in advance. When operating the HID headlamp, operate it after assembly is completed and never turn on the lights without a bulb installed. Do not turn on the HID headlamp using a power source other than the vehicle's.

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1. PARTS DESCRIPTION
2. OPERATION DESCRIPTION Manual lighting system The driver side J/B ECU receives the following: Light SW tail signal Light SW head signal Light SW high beam signal Front fog SW signal Lighting system passing signal The driver side J/B ECU controls the following based on the signals listed in (1): Headlamp ON demand signal Sent when light SW head signal is received. Tail lamp ON demand signal Sent when light SW tail signal and light SW head signal are received. High beam ON signal Sent when light SW high beam signals is received. Front fog light ON signal Sent when light SW tail and front fog SW signals are received. The driver side J/B ECU controls the on/off operation of the following based on the signals listed in (2): Headlamp (low) Headlamp (high) Clearance lamp Side marker lamp Front fog lamp Tail lamp License plate lamp Automatic light control system The driver side J/B ECU receives the following: Light SW auto signal Light control SW signal The driver side J/B ECU controls the following based on the signals listed in (1): Headlamp ON demand signal Sent according to the illuminance information from the light control signal when the light SW auto signal is received. Tail lamp ON demand signal Sent according to the illuminance information from the light control signal when the light SW auto signal is received. The driver side J/B ECU controls the on/off operation of the following based on the signals listed in (2): Headlamp (low) Clearance lamp Side marker lamp Tail lamp License plate lamp Turn signal lamp system The driver side J/B ECU receives the following: Right turn signal Left turn signal Hazard warning signal The driver side J/B ECU controls the following based on the signals listed in (1): Right turn ON demand signal Sent when the right turn signal or hazard warning signal is received. Left turn ON demand signal Sent when the left turn signal or hazard warning signal is received. The driver side J/B ECU controls the on/off operation of the following based on the signals listed in (2): Right turn signal lamp Left turn signal lamp Daytime running light system The driver side J/B ECU receives the following: Light SW tail signal Light SW head signal Light SW auto signal Light control signal Alternator L terminal signal Shift position P signal Parking brake SW signal The driver side J/B ECU controls the following based on the signals listed in (1): DRL ON demand signal Sent when the alternator L terminal signal has been received but the light SW tail, light SW head, parking brake SW, and shift position P signals have not been received. Sent when the alternator L terminal signal has been received but the illuminance information from the light control, parking brake SW, and shift position P signals have not been received. The driver side J/B ECU controls the on/off operation of the following: Headlamp (high) Light auto cut delay system The driver side J/B ECU receives the following: Light SW tail signal Light SW head signal Light SW auto signal Front fog SW signal Ignition SW signal Light control signal Driver's seat courtesy SW signal The driver side J/B ECU controls the following based on the signals listed in (1): Headlamp ON demand signal Terminates communication when the ignition SW signal terminates and the driver's seat courtesy SW signal is received while sending the headlamp ON demand signal. The headlamp ON demand signal results from receiving the light SW head signal or illuminance information from the light control signal. Tail lamp ON demand signal Terminates communication when the ignition SW signal terminates and the driver's seat courtesy SW signal is received while sending the tail lamp ON demand signal. The tail lamp ON demand signal results from receiving the light SW tail signal or illuminance information from the light control signal. Front fog lamp ON demand signal Terminates communication when the ignition SW signal terminates and the driver's seat courtesy SW signal is received while sending the front fog lamp ON signal. The front fog lamp ON signal results from receiving the light SW tail signal, the light SW head signal, and the front fog SW signal, or from receiving the front fog SW signal and illuminance information from the light control signal. Light reminder prohibit signal Sent while sending the headlamp ON demand signal and tail lamp ON demand signal during delay operation. The driver side J/B ECU controls the on/off operation of the following: Headlamp (low) Headlamp (high) Clearance lamp Front fog lamp Side marker lamp Tail lamp License plate lamp Stop light system The luggage room J/B ECU receives the following: Stop lamp ON demand signal Brake control signal The luggage room J/B ECU controls the following based on the signals listed in (1): Stop lamp ON demand signal Sent when the stop lamp ON demand signal from another ECU is sent and during brake control. The luggage room J/B ECU controls the on/off operation of the following: Stop lamp High-mounted stop lamp Back up lamp system The luggage room J/B ECU receives the following: Shift position R signal The luggage room J/B ECU controls the following based on the signal in (1): Back up lamp ON demand signal Sent when the shift position R signal is received. The luggage room J/B ECU controls the on/off operation of the following: Back up lamp Illuminated entry system The passenger side J/B ECU receives the following: D/P/RR/RL door courtesy SW signal D/P RR/RL door lock signal Ignition SW signal The passenger side J/B ECU controls the following based on the signals listed in (1): Illumination ON demand signal Sent when the respective door courtesy SW signal, door lock signal or ignition SW signal is received. The passenger side J/B ECU controls on/off and fade-in/fade-out operations of the following based on the signals listed in (2): Ignition key cylinder lamp Front room lamp Rear room lamp The passenger side J/B ECU receives the following: RR/RL door courtesy SW signal D/P/RR/RL door lock signal The passenger side J/B ECU controls the following based on the signals listed in (1): RR room lamp ON demand signal Sent when the respective door courtesy SW signal or door lock signal is received. RL room lamp ON demand signal Sent when the respective door courtesy SW signal or door lock signal is received. The passenger side J/B ECU controls the fade-in/fade-out operation of the following based on the signals listed in (2): RR room lamp RL room lamp Center console spot illumination system The passenger side J/B ECU receives the following: Ignition SW signal The passenger side J/B ECU controls the following based on the signals listed in (1): Center console lamp ON demand signal Sent when the ignition SW signal is sent. The passenger side J/B ECU controls the fade-in/fade-out operation of the following based on the signals in (2): Center console lamp Step light system The passenger side J/B ECU receives the following: D/P/RR/RL door courtesy SW signal D/P/RR/RL door lock signal Shift position P signal Ignition key SW signal The passenger side J/B ECU controls the following based on the signals listed in (1): Step light ON demand signal Sent when the respective door courtesy SW signal or door lock signal is received or when the shift position P and ignition SW signals are received. The passenger side J/B ECU controls on/off/fade-in/fade-out/light control operation of the following based on the signal in (2): Step lamp Inside handle illumination system The passenger side J/B ECU receives the following: D/P/RR/RL door courtesy SW signal D/P/RR/RL door lock signal Shift position P signal Ignition SW signal The passenger side J/B ECU controls the following based on the signals listed in (2): Illumination ON demand signal Sent when the respective door courtesy SW signal or door lock signal is received or when the shift position P signal and ignition SW signal are received. The passenger J/B ECU controls the on/off and fade-in/fade-out operations of the following: Inside handle illumination Buckle illumination system The driver side J/B ECU and passenger side J/B ECU receive the following: D/P/RR/RL door courtesy SW signal D/P/RR/RL door lock signal The driver side J/B ECU and passenger side J/B ECU control the following based on the signals listed in (1): Buckle illumination ON demand signal Sent when the respective courtesy SW signal or door lock signal is received. The driver side J/B ECU and passenger side J/B ECU control the on/off operation of the following: Buckle illumination Door courtesy lamp ignition system The driver side J/B ECU, passenger side J/B ECU, rear door RH ECU and rear door LH ECU receive the following: D/P/RR/RL door courtesy SW signal The driver side J/B ECU, rear door RH ECU and rear door LH ECU send the following based on the signal is listed in (1): Courtesy lamp ON demand signal Sent when the respective door courtesy SW signal is received. The driver side J/B ECU, passenger side J/B ECU, rear door RH ECU and rear door LH ECU control the on/off operation of the following: Courtesy lamp illumination Door mirror lamp (Outer foot lamp) The driver side J/B ECU and passenger side J/B ECU receive the following: D/P/RR/RL door courtesy signal D/P/RR/RL door lock signal The driver side J/B ECU and passenger side J/B ECU control the following based on the signals listed in (1): Door mirror lamp ON demand signal Sent when the respective door courtesy SW signal or door lock signal is received. The driver side J/B ECU and passenger side J/B ECU control on/off operation of the following: Door mirror lamp Room illumination system The driver side J/B ECU receive the following: Light SW auto signal Light SW tail signal Light SW head signal Light control signal The driver side J/B ECU controls the following based on the signals listed in (1): Tail lamp ON demand signal Sent when the light SW tail or head signal is received or based on illuminance information from the light control signal when the light SW auto signal is received. The driver side J/B ECU control the on/off operation of the following based on the signal in (2): Each room lamp RR/RL ash-tray illumination AFS The AFS ECU receives the following: Headlamp ON demand signal DRL ON demand signal Alternator L terminal signal Shift position signal Zero point value stored in steering angle sensor Steering angle sensor signal Vehicle height sensor signal Vehicle speed signal AFS OFF SW signal The AFS ECU controls the following based on the signals listed in (1): Leveling actuator operation demand Drive based on the vehicle height sensor signal when the headlamp ON demand signal or alternator L terminal signal is received and the DRL on demand signal is not received. Swivel motor operation demand Drive according to the vehicle speed signal and steering angle sensor signal when the headlamp ON demand signal, alternator L terminal signal and zero-point value stored in the steering angle sensor are received and the DRL ON demand signal, shift position R and N signals, and AFS OFF SW signal are not received. AFS warning signal Sent when an abnormality is detected in the respective signal or system. AFS OFF indicator signal Sent when the AFS OFF SW is pushed. Headlamp leveling warning signal ( * 1) Sent when an abnormality is detected to the passenger side J/B ECU in the respective signal or system. The AFS ECU controls the following based on the signals listed in (2): Headlamp leveling actuator LH Headlamp leveling actuator RH Swivel motor RH Swivel motor LH AFS OFF indicator lamp Headlamp leveling warning ( * 1) ( * 1: For Korean models)

OPERATION CHECK

1. ILLUMINATED ENTRY SYSTEM OPERATION CHECK Illuminated entry system controls the following: Key cylinder lamp Room lamp assy No. 1 (Front dome lamp) Check that the lamps come on after: Unlocking any door that was closed and locked with the ignition switch off. Check that the lamps fade out after: Leaving the doors unlocked for 15 seconds. Turning the ignition switch to the ACC or ON position. Locking all the doors. Check that the lamps stay on for at least 15 seconds after opening any of the doors, then fade out again after 15 seconds. Check that the lamps come on after: Closing all the doors and turning the ignition switch off from the ACC or ON position. Check that the lamps fade out after: Leaving the doors unlocked for 15 seconds. Locking all the doors. Check that the lamp stay on for at least 15 seconds after opening any of the doors, then fade out again in 15 seconds after closing all the doors. Check that the lamps come on when opening any of the doors and fade out after either closing and locking them or turning the ignition switch to the ACC or ON position.
2. REAR DOME LAMP OPERATION CHECK Rear dome lamp controls the following: Interior lamp rear LH and RH Check that the interior lamp rear LH comes on when the rear door LH is opened. Then check that the interior lamp rear LH fades out when the rear door LH is closed. Check that the interior lamp rear RH comes on when the rear door RH is opened. Then check that the interior lamp rear RH fades out when the rear door RH is closed.
3. OVERHEAD CONSOLE ILLUMINATION OPERATION CHECK Turn the ignition switch to the ACC position, and check that the center console spot illumination in the overhead J/B comes on. Turn the ignition switch off, and check that the center console spot illumination in overhead J/B goes off immediately.
4. STEP LIGHT AND INSIDE HANDLE ILLUMINATION OPERATION CHECK Check that the lamps come on when unlocking any of the doors that are closed and locked with the ignition switch off. Then check that the lamps fade out under the following conditions: Leave the doors unlocked for 15 seconds. Lock all the closed doors and turn the ignition switch off. Check that the lamps stay on for at least 15 seconds under the following conditions before going off under the conditions as shown in (a). Turn the ignition switch to the ON position, and adjust the shift lever to the P position. Open any of the doors. Check that the lamps dim before going off when turning the ignition switch to the ON position and shifting into any position other than P under the conditions as shown in (a). Check the conditions below before the lamps go off under the conditions as shown in (b). The lamps dim when shifting into the position other than P and closing all the doors with the ignition switch on. The lamps come on for 15 seconds and fade out when shifting into the P position and closing all the doors with the ignition switch off. Check that the lamps come on after opening any of the doors. Check that the lamps fade out in 15 seconds after closing all the doors, or locking all the doors. Check that the lamps come on gradually with the ignition switch on and the shift lever in the P position. Check that the lamps dim when shifting from P into another position with all the doors closed. Check that the lamps stay dimmed with the ignition switch on and the shift lever in any position other than P.
5. LIGHT AUTO TURN OFF OPERATION CHECK Turn the ignition switch to the ON position, and switch the headlamp into the TAIL or HEAD position. Turn the ignition switch off and open the driver's door, and check that the headlamps go off after approximately 30 seconds. Turn the ignition switch to the ON position, and switch the headlamp to the TAIL or HEAD position. Turn the ignition switch off and open the driver's door. Before the headlamps go off after approximately 30 seconds, lock all the doors. Check that the headlamp go off immediately.
6. AUTOMATIC LIGHT CONTROL OPERATION CHECK Turn the ignition switch to the ON position. Turn the headlamp dimmer switch to the AUTO position. Cover the automatic light control sensor and check that the tail lamp and headlamp come on in order. Uncover the automatic light control sensor and check that the headlamp and tail lamp go off in order.
7. DAYTIME RUNNING LIGHT OPERATION CHECK Check that the high beams come on when the headlamp switch is off, the engine is running, the shift lever is in the position except P, and the parking brake is released. Check that the high beams go off when turning the headlamp dimmer switch into the TAIL or HEAD (LOW) position under the condition as shown in (a). Check that the high beams go off when turning the ignition switch off under the condition as shown in (a).
8. AFS OPERATION CHECK Check that the initialization (determination of the initial position) of the leveling motor and swivel motor is performed at engine-start. Check that the warning indicator in the combination meter assy comes on for approximately 3 seconds when the ignition switch is in ON position. Check that the warning indicator in the combination meter assy comes on when the AFS OFF switch is pressed. Check that the warning indicator in the combination meter assy goes off when the AFS OFF switch is not pressed.

See also:
• REPLACEMENT
• OVERHAUL
• REPLACEMENT
• REPLACEMENT
• REPLACEMENT