Supplemental Restraint System (Diagnostics - Introduction): Other Lexus HS I

PRECAUTION

HINT

1. In the airbag system, the center airbag sensor assembly, front airbag sensors, side airbag sensors and rear airbag sensors are collectively referred to as the airbag sensors.
2. The steering pad, driver side knee airbag assembly, front passenger side knee airbag assembly, front passenger airbag assembly, curtain shield airbag assemblies, front seat side airbag assemblies, rear seat side airbag assemblies, front seat outer belt assemblies and rear seat 3 point type belt assemblies are collectively referred to as the SRS parts.

1. PRECAUTION FOR HANDLING SRS SYSTEM Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Furthermore, if a mistake is made when servicing the SRS, it is possible that the SRS may fail to operate when required. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the following items carefully, then follow the procedures exactly as indicated in the repair service information.
2. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL As SRS malfunctions are difficult to confirm, the Diagnostic Trouble Codes (DTCs) become the most important source of information when troubleshooting. When troubleshooting the SRS, always check for DTCs before disconnecting the battery. 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. WARNING: The SRS is equipped with a back-up power source. If work is started within 90 seconds after disconnecting the cable from the negative (-) battery terminal, the SRS may deploy. Never use a back-up power source (battery or other) to avoid clearing the system memory. The back-up power source may inadvertently power the SRS and cause it to deploy. NOTE: w/ Navigation System for HDD: After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait at least 60 seconds before disconnecting the cable from the negative (-) battery terminal. When the cable is disconnected from the negative (-) battery terminal, the memory of various systems will be cleared. Because of this, be sure to make a record of the contents memorized in each system before starting work. When work is finished, adjust each system to its previous state.
3. GENERAL PRECAUTION Use a voltmeter/ohmmeter with high impedance (minimum = 10 kohms) for troubleshooting electrical circuits. Information labels are attached to the SRS parts. Follow the instructions on the labels. Never disassemble or attempt to repair any of the SRS parts. If any of the SRS parts are dropped, or if any cracks, dents or other defects are found, replace them with new parts. Never use SRS parts from another vehicle. When replacing parts, use new parts. Do not expose any of the SRS parts directly to high temperatures or flames. If the vehicle has been involved in a minor collision where the SRS does not deploy, the SRS parts should be inspected before further use of the vehicle. Do not apply grease, detergent, oil or water to the SRS parts. If applied, immediately wipe it off with a dry cloth. When deploying or storing the SRS parts, avoid places with a high temperature (ambient temperature of 93°C (199°F) or higher for an airbag and 80°C (176°F) or higher for a pretensioner) and high humidity, and keep them away from electrical noise. Do not stack or place anything on top of the SRS parts. When disposing of the vehicle or an SRS part by itself, deploy it using SST before disposal. Deploy the SRS parts in a safe place away from electrical noise. HINT: Disposal of the steering pad. Refer to «DISPOSAL»(ref-398090-S18065154342011051600000) Disposal of the driver side knee airbag assembly. Refer to «DISPOSAL»(ref-398090-S31389231962011051600000) Disposal of the front passenger side knee airbag assembly. Refer to «DISPOSAL»(ref-398090-S32648478672011051600000) Disposal of the front passenger airbag assembly. Refer to «DISPOSAL»(ref-398090-S42534735972011051600000) Disposal of the curtain shield airbag assemblies. Refer to «DISPOSAL»(ref-398090-S04809057972011051600000) Disposal of the front seat side airbag assemblies. Refer to «DISPOSAL»(ref-398090-S06430241642011051600000) Disposal of the rear seat side airbag assemblies. Refer to «DISPOSAL»(ref-398090-S02823632542011051600000) Disposal of the front seat outer belt assemblies. Refer to «DISPOSAL»(ref-398091-S31870439722011051600000) Disposal of the rear seat 3 point type belt assemblies. Refer to «DISPOSAL»(ref-398091-S34187051562011051600000) Never inspect the resistance of the SRS parts. WARNING: Never measure the resistance of the SRS parts because current from the tester may cause the SRS parts to deploy.
4. PRECAUTION FOR DISPOSAL OF SRS PARTS (NOT DEPLOYED) Before performing pre-disposal deployment of any SRS parts, review and closely follow all applicable environmental and hazardous material regulations. Pre-disposal deployment may be considered hazardous material treatment. Never dispose of any SRS parts that are not deployed. Deploy the SRS parts outdoors in a safe and level place where it will not disturb nearby residents. As the SRS parts produce a loud sound when deployed, be sure to inform nearby residents before deployment. When deploying the SRS parts, always use SST and keep people at least 10 m (32.8 ft.) away. The SRS parts may be accidentally deployed by static electricity. To prevent this, be sure to touch a grounded metal surface with your bare hands to discharge any static electricity before handling the SRS parts. Do not face the airbag deployment side down when deploying an airbag.
5. PRECAUTION FOR DISPOSAL OF SRS PARTS (DEPLOYED) As the SRS parts are very hot after being deployed, allow at least 30 minutes for them to cool down sufficiently before disposal. Do not apply water etc. to any deployed SRS parts. Use gloves and safety glasses when handling any deployed SRS parts. Seal the deployed SRS parts in a thick clear plastic bag when disposing them. Always wash your hands with water after disposing of deployed SRS parts.
6. PRECAUTION FOR STEERING PAD (DRIVER AIRBAG), DRIVER SIDE KNEE AIRBAG ASSEMBLY, FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLY, FRONT PASSENGER AIRBAG ASSEMBLY, CURTAIN SHIELD AIRBAG ASSEMBLY, FRONT SEAT SIDE AIRBAG ASSEMBLY AND REAR SEAT SIDE AIRBAG ASSEMBLY Keep the airbag deployment side facing upward even when the airbag is temporarily removed during an operation. WARNING: Always place a removed or new airbag with the deployment surface facing upward. Placing the airbag with the deployment surface facing downward could cause a serious accident if the airbag deploys.
7. PRECAUTION FOR FRONT SEAT OUTER BELT ASSEMBLY (PRETENSIONER) Do not touch the area around the retractor even when the pretensioner is temporarily removed during an operation. WARNING: If the retractor unexpectedly operates and the belt is retracted during an operation, it could cause a serious accident.
8. PRECAUTION FOR SPIRAL CABLE Do not replace the spiral cable with the battery connected and the power switch on (IG). Do not rotate the spiral cable with the battery connected and the power switch on (IG). Ensure that the steering wheel is installed and aligned straight when inspecting the steering sensor. Do not remove the steering sensor from the spiral cable. Be sure the spiral cable is in the neutral position during installation and when removing and installing the steering wheel. Refer to «INSTALLATION - Step 8»(ref-398090-S05069805092011051600000) . WARNING: If the steering wheel is turned without the spiral cable installed in the neutral position, the cable may break.
9. PRECAUTION FOR AIRBAG SENSORS When the SRS parts are deployed (including when only an airbag or pretensioner is deployed) due to a collision, be sure to replace all sensors (center airbag sensor assembly, front airbag sensors, side airbag sensors and rear airbag sensors) as a set.
10. PRECAUTION FOR WIRE HARNESS AND CONNECTOR All wire harnesses except unexposed harnesses in the engine room are colored yellow. As special connectors are used, be careful when handling them.
11. WHEN SERVICING DAMAGED VEHICLE Before using an electric welder on the vehicle, remove any SRS parts around the area being repaired. WARNING: Make sure to remove any SRS parts as necessary to prevent them from accidentally deploying. Before repairs, remove the airbag sensor assemblies if impacts are likely to be applied to the sensor during repairs. Never expose an airbag sensor directly to high temperatures. As the SRS parts are very hot after being deployed, ensure that all wire harnesses and connectors around deployed SRS parts are not damaged.
12. CONDITIONS WHEN INSPECTION OF SRS PARTS IS NECESSARY When the vehicle is damaged in a collision even when the SRS parts are not deployed. When an SRS system DTC is output.

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COMMUNICATION TABLE

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1. GENERAL G sensors used for the airbag system are installed on various parts on the vehicle and calculate the deceleration rate of each part during a collision. Depending on the situation, the center airbag sensor assembly sends a deployment signal to each airbag based on the information from each sensor.
2. DEPLOYMENT CONDITION Frontal collision Frontal collision signals are produced based on the information from the center airbag sensor assembly and front airbag sensors. HINT: *: In case of a frontal collision, the ignition signal could be output with the deceleration sensor ON signal even without a signal from the front airbag sensors. Frontal collision signals are used to deploy the airbags except the side airbags and curtain shield airbags. Side collision (1) The front seat side airbags are deployed based on signals from the side airbag sensors and center airbag sensor assembly. HINT: The rear seat side airbags and curtain shield airbags are deployed at the same time. Side collision (2) The rear seat side airbags and curtain shield airbags are deployed when both of the following conditions are met: Signals from the side airbag sensors or rear airbag sensors are received. Signal from the center airbag sensor assembly is received.

CHECK MODE PROCEDURE

1. CHECK MODE (SIGNAL CHECK): DTC CHECK Turn the power switch off. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / SRS Airbag / Utility / Signal Check, and proceed with checking using the Techstream. NOTE: Select Signal Check screen on the Techstream to clear the output DTCs (both present and history). HINT: DTCs can be detected more sensitively in check mode than in normal diagnosis mode. Perform check mode inspection when a malfunction in each squib circuit is suspected even after the normal system code is output through normal diagnosis mode inspection.