Part 2
INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION
6. FOR VEHICLES WITH SUPPLEMENTAL RESTRAINT SYSTEM
The LEXUS LS600h L is equipped with a Supplemental Restraint System (SRS). The SRS of this vehicle consists of the following:
* Steering pad
* Driver side knee airbag assembly
* Front passenger side knee airbag assembly
* Front passenger airbag assembly
* Curtain shield airbag assembly
* Front seat side airbag assembly
* Rear seat side airbag assembly
* Center airbag sensor assembly
* Seat cushion airbag assembly
* Active headrest inflator
* Front airbag sensor
* Side airbag sensor
* Rear airbag sensor
* Seat position airbag sensor
* Occupant classification ECU
* Front seat outer belt assembly with pretensioner
* Rear seat outer belt assembly with pretensioner
CAUTION:
* Failure to carry out service procedures in the correct sequence could cause SRS parts to unexpectedly deploy and possibly lead to serious injuries. Furthermore, if a mistake is made when servicing SRS parts, they may fail to operate when required. Before performing servicing (including installation/removal, inspection and replacement of parts), be sure to read the following precautions.
* Before starting work, wait at least 90 seconds after the power switch is turned OFF and after the cable of the negative (-) battery terminal is disconnected. (SRS parts are equipped with a backup power source. If work is started within 90 seconds of turning the power switch OFF and disconnecting the cable from the negative (-) battery terminal, SRS parts may deploy.)
* Do not expose SRS parts directly to hot air or flames.
NOTICE:
* Malfunction symptoms of SRS parts are difficult to confirm. DTCs are the most important source of information when troubleshooting. During troubleshooting, always confirm DTCs before disconnecting the cable from the negative (-) battery terminal.
* For minor collisions where SRS parts do not deploy, always inspect the SRS parts.
* Before performing repairs, remove airbag sensors as necessary if any kind of impact is likely to occur to an airbag sensor during repairs.
* Never use SRS parts from another vehicle. When replacing SRS parts, replace them with new ones.
* Never disassemble or attempt to repair SRS parts.
* When replacing a deployed active headrest inflator, always replace it together with the headrest.
* If an SRS part has been dropped, or if there are any cracks, dents or other defects in the case, bracket or connector, replace the SRS part with a new one.
* Use an ohmmeter/voltmeter with high impedance (10 kOhms/V minimum) for troubleshooting the electrical circuits.
* Information labels are attached to the periphery of SRS parts. Follow the cautions and instructions on the labels.
* After work on SRS parts is completed, perform the SRS warning light check.
* When the cable is disconnected from the negative (-) battery terminal, the memory settings of each system will be cleared. Because of this, be sure to write down the settings of each system before starting work. When work is finished, reset the settings of each system as before. Never use a backup power supply from outside the vehicle to avoid erasing the memory in a system.
* An airbag or pretensioner may be activated by static electricity. To prevent this, be sure to touch a metal surface with bare hands to discharge static electricity before performing this procedure.
(a) SPIRAL CABLE
(1) The steering wheel must be fitted correctly to the steering column with the spiral cable at the neutral position, as cable disconnection and other problems may occur. Refer to the information about correct installation of the steering wheel.
(b) AIRBAG ASSEMBLY
(1) Airbag assembly with pad:
Always place a removed or new airbag assembly with the pad surface facing upward. Placing the airbag assembly with the airbag inflation direction facing downward could cause a serious accident if the airbag inflates. Also, do not place anything on top of the airbag assembly.
(2) Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause a serious injury.
(3) Grease or detergents of any kind should not be applied to the airbag assembly.
(4) Store the airbag assembly in an area where the ambient temperature is below 93°C (200°F), the humidity is not high and there is no electrical noise.
(5) When using electric welding anywhere on the vehicle, disconnect the center airbag sensor connectors. These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to currents entering the squib wiring.
(6) When disposing of the vehicle or the airbag assembly by itself, the airbag should be deployed using SST before disposal. Activate the airbag in a safe place away from electrical noise.
(c) SEAT OUTER BELT ASSEMBLY WITH PRETENSIONER
(1) Never measure the resistance of the seat outer belt. This may cause the pretensioner of the seat outer belt to activate, which could cause a serious injury.
(2) Never install the seat outer belt on another vehicle.
(3) Store the seat outer belt in an area where the ambient temperature is below 80°C (176°F), the humidity is not high and there is no electrical noise.
(4) When using electric welding anywhere on the vehicle, disconnect the center airbag sensor connectors (2 pins). These connectors contain shorting springs. This feature reduces the possibility of the pretensioner deploying due to currents entering the squib wiring.
(5) When disposing of a vehicle or the seat outer belt by itself, the pretensioner should be activated before disposal. Activate the pretensioner in a safe place away from electrical noise.
(6) As the seat outer belt is hot after the pretensioner is activated, allow some time for it to cool down sufficiently before disposal. Never apply water to try to cool down the seat outer belt.
(7) Grease, detergents, oil or water should not be applied to the seat outer belt.
(d) AIRBAG SENSOR ASSEMBLY
(1) Never reuse an airbag sensor assembly that has been involved in a collision where the SRS has deployed.
(2) The connectors to the airbag sensor assembly should be connected or disconnected with the sensor placed on the floor. If the connectors are connected or disconnected while the airbag sensor assembly is not placed on the floor, the SRS may activate.
(3) Work must be started at least 90 seconds after the power switch is turned OFF and the cable is disconnected from the negative (-) battery terminal, even if only loosening the set bolts of the airbag sensor assembly.
(e) WIRE HARNESS AND CONNECTOR
(1) The SRS wire harness is integrated with the instrument panel wire harness assembly. All the connectors in the system are yellow. If the SRS wire harness becomes disconnected or the connector becomes broken, replace it.
7. ELECTRONIC CONTROL
(a) REMOVAL AND INSTALLATION OF BATTERY TERMINAL
NOTICE:
* Always remove the service plug to cut off the high-voltage circuit when servicing or inspecting high-voltage parts and wiring.
* Carry the removed service plug grip in your pocket to prevent other technicians from reinstalling it while servicing the vehicle.
* The high-voltage wiring and connectors are all colored orange.
(1) Before performing electronic work, disconnect the cable from the negative (-) battery terminal to prevent component and wire damage caused by accidental short circuits.
(2) When disconnecting the cable, turn the power switch OFF and headlight dimmer switch OFF and loosen the cable nut completely. Perform these operations without twisting or prying the cable. Then disconnect the cable.
(3) Clock settings, radio settings, audio system memory, DTCs and other data are erased when the cable is disconnected from the negative (-) battery terminal. Write down any necessary data before disconnecting the cable.
(4) Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
(b) HANDLING OF ELECTRONIC PARTS
(1) Do not open the cover or case of the ECU unless absolutely necessary. If the IC terminals are touched, the IC may be rendered inoperative by static electricity.
(2) Do not pull the wires when disconnecting electronic connectors. Pull the connector.
(3) Be careful not to drop electronic components, such as sensors or relays. If they are dropped on a hard surface, they should be replaced.
(4) When cleaning the engine with steam, protect the electronic components, air filter and emission-related components from water.
(5) Never use an impact wrench to remove or install temperature switches or temperature sensors.
(6) When measuring the resistance of a wire connector, insert the tester probe carefully to prevent terminals from bending.
(7) Do not expose electronic parts to high temperatures and humidity.
(8) Do not touch the terminals of the connectors, as a malfunction due to static electricity and/or deformation may occur.
8. REMOVAL AND INSTALLATION OF FUEL CONTROL PARTS
(a) PLACE FOR REMOVING AND INSTALLING FUEL SYSTEM PARTS
(1) Work in a location with good air ventilation that does not have welders, grinders, drills, electric motors, stoves, or any other ignition sources.
(2) Never work in a pit or near a pit as vaporized fuel will collect in those places.
(b) REMOVING AND INSTALLING FUEL SYSTEM PARTS
(1) Prepare a fire extinguisher before starting the operation.
(2) To prevent static electricity, install a ground wire to the fuel changer, vehicle and fuel tank, and do not spray the surrounding area with water. Be careful when performing work in this area, as the work surface will become slippery. Do not clean up gasoline spills with water, as this may cause the gasoline to spread, and possibly create a fire hazard.
(3) Avoid using electric motors, working lights and other electric equipment that can cause sparks or high temperatures.
(4) Avoid using iron hammers as they may create sparks.
(5) Dispose of fuel-contaminated cloths separately using a fire resistant container.
9. REMOVAL AND INSTALLATION OF ENGINE INTAKE PARTS
(a) If any metal particles enter inlet system parts, they may damage the engine.
(b) When removing and installing inlet system parts, cover the openings of the removed parts and engine openings. Use gummed tape or other suitable materials.
(c) When installing inlet system parts, check that no metal particles have entered the engine or the installed parts.
10. HANDLING OF HOSE CLAMPS
(a) Before removing the hose, check the clamp position so that it can be reinstalled in the same position.
(b) Replace any deformed or dented clamps with new ones.
(c) When reusing a hose, attach the clamp on the clamp track portion of the hose.
(d) For a spring type clamp, you may want to spread the tabs slightly after installation by pushing in the direction of the arrows as shown in the illustration.
11. FOR VEHICLES EQUIPPED WITH MOBILE COMMUNICATION SYSTEMS
(a) Install the antenna as far away from the ECU and sensors of the vehicle electronic systems as possible.
(b) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the vehicle electronic systems. For details about ECU and sensor locations, refer to the section of the applicable components.
(c) Keep the antenna and feeder separate from other wiring as much as possible. This will prevent signals from the communication equipment from affecting vehicle equipment and vice versa.
(d) Check that the antenna and feeder are correctly adjusted.
(e) Do not install a high-powered mobile communication system.
12. HEADLIGHT INSPECTION MAINTENANCE
(a) for HID Headlight
(1) When the headlight dimmer switch assembly is set to HEAD, do not touch the discharge headlight's high-voltage socket area.
(b) for LED
(1) When the headlight dimmer switch assembly is set to HEAD, do not touch the LED.
(c) When the headlights are illuminated, do not cover the headlights for 3 minutes or more.
NOTICE:
* As the headlight's outer lens is made of resin, the resulting heat created when covering the headlight for an extended period of time may deform the headlight.
* When performing inspection maintenance, the discharge headlight's precautions must be followed Service Precautions.
13. FOR VEHICLES EQUIPPED WITH TR(A)C (TRACTION CONTROL) SYSTEM AND VSC (VEHICLE STABILITY CONTROL) SYSTEM
(a) Notices for when using a chassis dynamometer.
When testing with a drum tester such as a speedometer tester, a combination tester for the speedometer and brake, a chassis dynamometer, or when jacking up the rear wheels and turning the wheels, enter the "Inspection Mode" with the Techstream and change to traction control off mode and VSC system off mode.
(1) Position the front wheels on free rollers or support the vehicle with rigid racks and make sure the front wheels can rotate freely.
(2) When testing with a speedometer tester, a combination tester for the speedometer and brake, a chassis dynamometer or similar, be sure to enter "Inspection Mode" and prohibit the TR(A)C and VSC controls.
(3) After completing the inspection, be sure to exit "Inspection Mode".
NOTICE:
Never drive the vehicle while in "Inspection Mode".
CAUTION:
* If the vehicle is tested in normal mode on the drum tester, TR(A)C and VSC operation may cause the vehicle to jump out from the drum tester.
* When switching to TR(A)C OFF mode, the VSC OFF switch must be held for 3 seconds or more with the vehicle stopped. TR(A)C and VSC operation must both be turned off before beginning testing.
*
During VSC OFF mode, VSC OFF is displayed in the multi-information display, and the combination meter's VSC OFF indicator light illuminates.
* Fix the vehicle in place with chains for safety.
(b) NOTICES FOR VSC RELATED PROCEDURES
(1) For VSC related parts, adjustments are required after removal and installation. Therefore, perform removal and installation only when necessary.
(2) When performing VSC related procedures, be sure to strictly follow the preparation and completion procedures.
(3) When performing removal and installation or replacement of VSC related parts, first disconnect the cable from the negative (-) battery terminal.
14. PRECAUTIONS FOR TOWING ALL WHEEL DRIVE VEHICLES
(a) Use one of the following methods to tow the vehicle.
(b) If the vehicle has trouble with the chassis or drivetrain, use method 1 (flatbed truck).
NOTICE:
Do not use any towing method other than those shown above.
(c) If a tow truck is not available, in an emergency the vehicle may be temporarily towed using a cable or chain secured to the emergency towing eyelet(s).
This should only be attempted on hard surfaced roads for distances of less than 80 km, and at speeds below 30km/h (19 mph).
A driver must be in the vehicle to steer and operate the brakes. The vehicle's wheels, drivetrain, axles, steering and brakes must be in good condition.
NOTICE:
If the towing speed or distance exceeds the above limits, or the vehicle is towed in a backward direction with any of the wheels on the ground, the drivetrain may be damaged.
(1) Emergency towing procedure
1 Turn the power switch ON (IG).
2 Depress the brake pedal and move the transmission shift lever to N.
3 Release the parking brake.
4 Release the brake pedal slowly.
NOTICE:
* Use extreme caution when towing the vehicle. Avoid sudden starts or erratic driving maneuvers which place excessive stress on the emergency towing eyelet and the cables or chains.
* Do not turn off the power switch. Turning off the power switch may result in engagement of the steering lock, resulting in a hazardous situation or accident.
(d) The towing methods shown below are dangerous and can damage the vehicle, so do not use them.
(1) Do not tow the vehicle with only 2 wheels on the ground.
NOTICE:
If the vehicle is towed with only the 2 wheels on the ground, the drivetrain may overheat and be damaged or the wheels may come off the dollies.
(2) Do not use a sling-type towing method either from the front or rear.
NOTICE:
If a sling-type tow truck is used, damage may occur to the vehicle body.
15. FOR VEHICLES EQUIPPED WITH CATALYTIC CONVERTER
CAUTION:
If a large amount of unburned gasoline or gasoline vapors flow into the converter, it may cause overheating and create a fire hazard. To prevent this, observe the following precautions.
(a) Use only unleaded gasoline.
(b) Avoid idling the engine for more than 20 minutes.
(c) Perform the spark test and cylinder compression check only when necessary, and as quickly as possible.
(d) Do not run the engine when the fuel tank is nearly empty. This may cause the engine to misfire and create an extra load on the converter.
16. INSPECTION AND ADJUSTMENT OF JOINT ANGLE DURING REMOVAL AND INSTALLATION OF PROPELLER SHAFT
(a) When performing operations which involve the removal and installation of the propeller shaft, always check the joint angle. Make adjustments if necessary.
