Precaution
PRECAUTION
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.
- Be sure to perform initialization of the occupant detection ECU when any
of the following conditions are met. If initialization is not
performed, the SRS may not operate properly.
- The occupant detection ECU is replaced.
- Accessories (seatback tray, seat cover, etc.) are installed to the vehicle.
- The passenger seat is removed from the vehicle, and then reinstalled or replaced.
- The passenger airbag ON/OFF indicator light (OFF) comes on when the passenger seat is not occupied.
- The vehicle is brought to a workshop for repair due to an accident or collision.
(a) If a mistake
is made when servicing SRS parts, they may fail to operate when
required. Before performing service (including installation/removal,
inspection and replacement of parts), be sure to read the following
precautions.
- Airbag ECU assembly
- Front airbag sensor
- Side airbag pressure sensor
- Side No. 1 airbag sensor
- Side No. 2 airbag sensor
- Seat position airbag sensor
- Horn button assembly
- Lower No. 1 instrument panel airbag assembly
- Lower No. 2 instrument panel airbag assembly
- Instrument panel passenger airbag assembly
- Curtain shield airbag assembly
- Front seat airbag assembly
- Rear seat airbag assembly
- Front seat inner belt assembly
- Front seat outer belt assembly
- Rear seat 3 point type belt assembly
- Occupant detection ECU
PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL
(a)
As SRS malfunctions are difficult to confirm, Diagnostic Trouble Codes
(DTCs) become the most important source of information when
troubleshooting. When troubleshooting the SRS, always check for DTCs
before disconnecting the cable from the negative (-) battery terminal.
(b) Make sure to turn the engine switch off before disconnecting the cable from the negative (-) battery terminal.
NOTICE:
After
turning the engine switch off, waiting time may be required before
disconnecting the cable from the negative (-) battery terminal.
Therefore, make sure to read the disconnecting the cable from the
negative (-) battery terminal notices before proceeding with work.
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HINT:
When
disconnecting the cable from the negative (-) battery terminal while
performing repairs, some systems need to be initialized after the cable
is reconnected.
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(c)
Work must be started at least 90 seconds after the engine 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 of disconnecting the cable from the negative (-) battery
terminal, the SRS parts may deploy.
(d)
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.
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GENERAL PRECAUTION
(a) Information labels are attached to the SRS parts. Follow the instructions on the labels.
(b) Never disassemble or attempt to repair any of the SRS parts.
(c) If any of the SRS parts are dropped, or if any cracks, dents or other defects are found, replace them with new parts.
(d) Never use SRS parts from another vehicle. When replacing parts, use new parts.
(e) Do not expose any of the SRS parts directly to high temperatures or flames.
(f)
If the vehicle has been involved in a minor collision where the SRS did
not deploy, the SRS parts should be inspected before further use of the
vehicle.
(g) Do not apply grease, detergent, oil or water to the SRS parts. If applied, immediately wipe it off with a dry cloth.
(h)
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.
(i) Do not stack or place anything on top of the SRS parts.
CAUTION:
Dispose of the airbags according to the disposal procedures for each airbag.
(j) Never measure the resistance of the SRS parts.
CAUTION:
Never measure the resistance of the SRS parts because current from the tester may cause the SRS parts to deploy.
(k) Use a voltmeter/ohmmeter with high impedance (minimum = 10 kΩ) for troubleshooting electrical circuits.
(l)
Be sure to check the SRS warning light and multi-information display
after checking, removing and installing, or replacing the airbag and
sensor.
PRECAUTION FOR HORN BUTTON ASSEMBLY, LOWER
NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY, LOWER NO. 2 INSTRUMENT PANEL
AIRBAG ASSEMBLY, INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY, CURTAIN
SHIELD AIRBAG ASSEMBLY, FRONT SEAT AIRBAG ASSEMBLY AND REAR SEAT AIRBAG
ASSEMBLY
(a) Keep the deployment side of an airbag facing upward even when the airbag is temporarily removed during service.
CAUTION:
Always
place a removed or a new airbag with the deployment side facing upward.
Placing the airbag with the deployment side facing downward could cause
a serious accident if the airbag deploys.
(b) When storing an airbag, do not place anything on top of it or place it in a pile.
PRECAUTION FOR FRONT SEAT OUTER BELT ASSEMBLY (PRETENSIONER) AND REAR SEAT 3 POINT TYPE BELT ASSEMBLY (PRETENSIONER)
(a)
Do not touch the area around the retractor, even when a front seat
outer belt assembly or rear seat 3 point type belt assembly is
temporarily removed during service.
CAUTION:
If
the pretensioner unexpectedly deploys and the front seat outer belt
assembly or rear seat 3 point type belt assembly is retracted during an
operation, it could cause a serious accident.
(b) When storing a pretensioner, do not place objects on top of it or place it in a pile.
PRECAUTION FOR SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY
(a) Do not remove/install the spiral cable with sensor sub-assembly with the battery connected and the engine switch on (IG).
(b)
Do not rotate the spiral cable with sensor sub-assembly without the
steering wheel assembly installed, with the battery connected and the
engine switch on (IG).
(c) Ensure that the steering wheel assembly is installed and aligned straight when inspecting the steering sensor.
(d)
When rotating the spiral cable with sensor sub-assembly, make sure to
push on the interlock to release the interlock mechanism.
(e)
Removing the steering sensor from the spiral cable sub-assembly without
using a lock pin may result in a misaligned center position of the
steering sensor. Therefore, make sure to use the lock pin provided with a
new spiral cable sub-assembly when removing the steering sensor from
the spiral cable sub-assembly.
(f) Be sure that the
spiral cable with sensor sub-assembly is in the neutral position during
installation and when removing and installing the steering wheel
assembly.
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NOTICE:
If
the steering wheel assembly is turned without the spiral cable with
sensor sub-assembly installed in the neutral position, the cable may
break.
PRECAUTION FOR AIRBAG SENSORS
(a)
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 in the damaged areas (anywhere in need of repair) and the airbag
ECU assembly.
(b) Visually check the airbag sensors in undamaged areas for defects.
(1) The defects are as follows:
- Cracks in the sensor housing
- Dents in the sensor housing
- Chips in the sensor housing
- Cracks or other damage to the connector
- Damage to the serial number
OK:
No defects are found.
If any defects are found or an airbag sensor has detected a major collision, replace the airbag sensor with a new one.
(c)
When disconnecting or reconnecting a connector of the airbag ECU
assembly, front airbag sensor, side airbag pressure sensor, side No. 1
airbag sensor, side No. 2 airbag sensor and seat position airbag sensor
connectors, make sure to do so with the sensor installed to the vehicle.
(d) If a sensor has been dropped make sure to replace it with a new one.
(e) If a sensor has been subjected to strong impact make sure to replace it with a new one.
(f) Never disassemble any of the SRS parts.
PRECAUTION WHEN REPLACING AIRBAG ECU ASSEMBLY
(a) When the airbag ECU assembly is replaced, perform zero point learning for the yaw rate and acceleration sensor.
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HINT:
The yaw rate and acceleration sensor is built into the airbag ECU assembly.
PRECAUTION FOR WIRE HARNESS AND CONNECTOR
(a) All wire harnesses except unexposed harnesses in the engine compartment are colored yellow.
(b) As special connectors are used, be careful when handling them.
WHEN SERVICING DAMAGED VEHICLE
(a) Before using an electric welder on the vehicle, remove any SRS parts around the area being repaired.
(b)
Before repairs, remove the airbag sensor assemblies/airbag ECU assembly
if impacts are likely to be applied to the sensor during repairs.
(c) Never expose an airbag sensor directly to high temperatures.
(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.
PRECAUTION FOR SIDE AIRBAG PRESSURE SENSOR
(a) Do not make any modifications to the front door that may change the inner pressure of the front door.
(b)
Do not allow any foreign matter to enter the side airbag pressure
sensor as it may affect the pressure detection performance of the
sensor.
(c) When painting the front door, remove or
apply protective tape to the side airbag pressure sensor to prevent
paint from attaching to it.
(d) Make sure that the
parts which maintain the sealing performance of the front door are
securely installed. If the sealing performance of the front door
decreases, the pressure detection performance of the side airbag
pressure sensor may be affected. Repair or replace parts as necessary.
CONDITIONS WHEN INSPECTION OF SRS PARTS IS NECESSARY
(a) When the vehicle is damaged in a collision, even if the SRS parts are not deployed.
(b) When SRS system DTCs are output.
