Toyota Sienna Service Manual: For vehicles equipped with srs airbag and seat belt pretensioner

The SIENNA is equipped with a Supplemental Restraint System (SRS).

CAUTION: Failure to carry out the service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing and lead to serious injury. Furthermore, if a mistake is made when servicing SRS, it is possible that the SRS may fail to operate properly. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the following section carefully.

(a) GENERAL NOTICE

(1) As malfunctions of the SRS are difficult to confirm, the Diagnostic Trouble Codes (DTCs) become the most important source of information when troubleshooting. When troubleshooting the SRS, always check the DTCs before disconnecting the battery.

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

The SRS is equipped with a back-up power source. If work is started within 90 seconds after turning the ignition switch off and disconnecting the cable from the negative (-) battery terminal, the SRS may deploy.

When the cable is disconnected from the negative (-) battery terminal, clock and audio system memory is erased. Before starting work, make a note of the settings of each memory system. When work is finished, reset the clock and audio system as before.

The back-up power source may inadvertently power the SRS and cause it to deploy.

(3) In minor collisions where the SRS does not deploy, the steering pad, front passenger airbag assembly front seat side airbag assembly, curtain shield airbag assembly and front seat outer belt assembly should be inspected before further use of the vehicle.

(4) Never use SRS parts from another vehicle.

When replacing parts, use new parts.

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

(6) Never disassemble and attempt to repair all airbag sensor assemblies and all airbag assemblies.

1. Steering pad
2. Front passenger airbag assembly
3. Front seat side airbag assembly
4. Curtain shield airbag assembly
5. Front seat outer belt assembly

(7) Replace the airbag sensor assemblies and the airbag assemblies if: 1) damage has occurred from being dropped, or 2) cracks, dents or other defects in the case, bracket or connector are present.

(8) Do not directly expose the airbag sensor assembly or airbag assembly to hot air or flames.

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

(10)Information labels are attached to the SRS components. Follow the instructions on the labels.

(11)After work on the SRS is completed, check the SRS warning light.

(b) 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

(c) STEERING PAD

(1) Always place a removed or new steering pad surface upward as shown in the illustration.

Placing the steering pad with the pad surface facing down could cause a serious accident if the airbag inflates. Also, do not place anything on top of the steering pad.

(2) Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause serious injury.

(3) Grease or detergents of any kind should not be applied to the steering pad.

(4) Store the steering pad 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 assembly connectors. These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to current entering the squib wiring.

(6) When disposing of the vehicle or the steering pad by itself, the airbag should be deployed using SST before disposal. Activate the airbag in a safe place away from electrical noise.

(d) FRONT PASSENGER AIRBAG ASSEMBLY

(1) Always place a removed or new front passenger airbag assembly with the pad surface facing upward as shown in the illustration. Placing the airbag assembly with the airbag inflation direction facing down could cause a serious accident if the airbag inflates.

(2) Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause serious injury.

(3) Grease or detergents of any kind should not be applied to the front passenger 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 assembly connectors. These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to current entering the squib wiring.

(6) When disposing of the vehicle or the airbag assembly unit by itself, the airbag should be deployed using SST before disposal. Activate in a safe place, away from electrical noise.

(e) FRONT SEAT SIDE AIRBAG ASSEMBLY

(1) Always place a removed or new front seat airbag assembly with the airbag inflation direction facing upward. Placing the airbag assembly with the airbag inflation direction facing downward could cause a serious accident if the airbag deploys.

(2) Never measure the resistance of the airbag squib (This may cause the airbag to inflate, which is very dangerous).

(3) Grease should not be applied to the front seat airbag assembly, and the airbag door should not be cleaned with detergents of any kind.

(4) Store the airbag assembly where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise.

(5) When using electric welding, disconnect the center airbag sensor assembly connector installed on the assembly before starting work.

(6) When disposing of a vehicle or the airbag assembly unit, the airbag should be deployed using SST before disposal.

Activate in a safe place away from electrical noise.

(f) CURTAIN SHIELD AIRBAG ASSEMBLY

(1) Always place the removed or new curtain shield airbag assembly in a clear plastic bag, and keep it in a safe place.

CURTAIN SHIELD AIRBAG ASSEMBLY

(2) Never measure the resistance of the airbag squib (This may cause the airbag to inflate, which is very dangerous).

(3) Grease should not be attached to the curtain shield airbag assembly, and the surface should not be cleared with detergents of any kind.

(4) Store the airbag assembly where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise.

(5) When using electric welding, disconnect the center airbag sensor assembly connector into the instrument panel before starting work.

(6) When disposing of a vehicle or the curtain shield airbag assembly unit, the airbag should be deployed using SST before disposal. Activate in a safe place away from electrical noise.

(g) FRONT SEAT OUTER BELT ASSEMBLY (SEAT BELT PRETENSIONER)

(1) Never measure the resistance of the front seat outer belt assembly. This may cause the pretensioner of the front seat outer belt assembly to activate, which could cause serious injury.

FRONT SEAT OUTER BELT ASSEMBLY (SEAT BELT PRETENSIONER)

(2) Never disassemble the front seat outer belt assembly.

(3) Never install the front seat outer belt assembly on another vehicle.

(4) Store the front seat outer belt assembly in an area where the ambient temperature is below 80°C (176°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 assembly connectors. These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to current entering the squib wiring.

(6) When disposing of a vehicle or the front seat outer belt assembly unit by itself, the front seat outer belt assembly should be activated before disposal. Activate in a safe place away from electrical noise.

(7) As the front seat outer belt assembly is hot after being activated, allow some time for it to cool down sufficiently before disposal. Never apply water to cool down the front seat outer belt assembly.

(8) Grease, detergents, oil or water should not be applied to the front seat outer belt assembly.

(h) CENTER AIRBAG SENSOR ASSEMBLY

(1) Never reuse an center airbag sensor assembly that has been involved in a collision where the SRS has deployed.

(2) The connectors to the center airbag sensor assembly should be connected or disconnected with the sensor placed on the floor. If the connectors are connected or disconnected while the center airbag sensor assembly is not placed on the floor, the SRS may activate.

3) 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, even if only loosening the set bolts of the center airbag sensor assembly.

(i) WIRE HARNESS AND CONNECTOR

(1) All the connectors in the system are a standard yellow color. If the SRS wire harness becomes disconnected or the connector becomes broken, repair or replace it.