SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: PRECAUTION; 2016 - 2020 MY Sienna [12/2015

HINT:

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.
The steering pad, knee airbag assembly, front passenger airbag assembly, curtain shield airbag assemblies and front seat side airbag assemblies are collectively referred to as the SRS parts.

(a) 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 manual.

(a) 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.

(b) Work must be started at least 90 seconds after the ignition switch is turned off and the cable is disconnected from the negative (-) battery terminal.

CAUTION:

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.

(c) 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.

(a) Use a voltmeter/ohmmeter with high impedance (minimum = 10 kΩ) for troubleshooting electrical circuits.

(b) Information labels are attached to the SRS parts. Follow the instructions on the labels.

(d) If any of the SRS parts are dropped, or if any cracks, dents or other defects are found, replace them with new parts.

(e) Never use SRS parts from another vehicle. When replacing parts, use new parts.

(g) 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.

(h) Do not apply grease, detergent, oil or water to the SRS parts. If applied, immediately wipe it off with a dry cloth.

(i) 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 a selectable force limiter) and high humidity, and keep them away from electrical noise.

(k) 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 (See page )
Disposal of the knee airbag assembly (See page )
Disposal of the front passenger airbag assembly (See page )
Disposal of the curtain shield airbag assemblies (See page )
Disposal of the front seat side airbag assemblies (See page )
Disposal of the front seat outer belt assemblies (See page )
Disposal of the front seat airbag sub-assembly (See page )

Never measure the resistance of the SRS parts because current from the tester may cause the SRS parts to deploy.

(a) 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.

(d) As the SRS parts produce a loud sound when deployed, be sure to inform nearby residents before deployment.

(e) When deploying the SRS parts, always use SST and keep people at least 10 m (32.8 ft.) away.

(f) 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.

(a) As the SRS parts are very hot after being deployed, allow at least 30 minutes for them to cool down sufficiently before disposal.

(d) Seal the deployed SRS parts in a thick clear plastic bag when disposing of them.

6. PRECAUTION FOR STEERING PAD (DRIVER AIRBAG), KNEE AIRBAG ASSEMBLY, FRONT PASSENGER AIRBAG ASSEMBLY, CURTAIN SHIELD AIRBAG ASSEMBLY FRONT SEAT AIRBAG SUB-ASSEMBLY FRONT SEAT SIDE AIRBAG ASSEMBLY AND FRONT SEATAIRBAG SUB-ASSEMBLY

(a) Keep the airbag deployment side facing upward even when the airbag is temporarily removed during an operation.

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 AND SELECTABLE FORCE LIMITER)

(a) Do not touch the area around the retractor even when the pretensioner and selectable force limiter is temporarily removed during an operation.

If the retractor unexpectedly operates and the belt is retracted during an operation, it could cause a serious accident.

(a) Do not replace the spiral cable with the battery connected and the ignition switch to ON.

(b) Do not rotate the spiral cable with the battery connected and the ignition switch to ON.

(e) Be sure the spiral cable is in the neutral position during installation and when removing and installing the steering wheel (See page

2016 - 2020 MY Sienna [12/2015 - ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: INSTALLATION

If the steering wheel is turned without the spiral cable installed in the neutral position, the cable may break.

(a) When any of the airbags have deployed due to the collision, be sure to replace all sensors in the damaged areas and center airbag sensor assembly.

(a) All wire harnesses except unexposed harnesses in the engine room are colored yellow.

(a) Before using an electric welder on the vehicle, remove any SRS parts around the area being repaired.

Make sure to remove any SRS parts as necessary to prevent them from accidentally deploying.

(b) Before repairs, remove the airbag sensor assemblies if impacts are likely to be applied to the sensor during repairs.

(d) As the SRS parts are very hot after being deployed, ensure that all wire harnesses and connectors around deployed SRS parts are not damaged.

(a) When the vehicle is damaged in a collision even when the SRS parts are not deployed.

(a) The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.