Toyota Corolla Repair Manual: For vehicles equipped with srs airbag and seat belt pretensioner
Hint
:
the vehicle is equipped with an srs (supplemental restraint system), such as the
horn button assembly,
the instrument panel passenger airbag assembly, the front seat airbag assembly,
the center airbag sensor
assembly, the front airbag sensor, the side airbag sensor and the seat belt
pretensioner.
Failure to carry out the service operations in the correct sequence could cause
the supplemental restraint
system to unexpectedly deploy during servicing. It may lead to a serious
accident.
Furthermore, if a mistake is made in servicing the supplemental restraint
system, it is possible that the srs
will 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
correct procedure described in
this manual.
- General notice
- Malfunction symptoms of the supplemental restraint system are difficult
to confirm, so the diagnostic
trouble codes become the most important source of information when
troubleshooting.
When troubleshooting the supplemental restraint system, always check the
diagnostic trouble codes before disconnecting the battery .
- Work must be started after 90 seconds from the time the ignition
switch is turned to the ”lock”
position and the negative (–) terminal cable is disconnected from the
battery.
(The supplemental restraint system is equipped with a back–up power source,
so, if work is
started within 90 seconds after disconnecting the negative (–) terminal
cable from the battery,
the srs may deploy.)
When the negative (–) terminal cable is disconnected from the battery,
memory of the clock and
audio systems will be cancelled. So, before starting work, make a record of
the memorized contents
in each memory system. Then, when work is finished, reset the clock and
audio systems
as before. To avoid erasing the memory in each memory system, never use a
back–up power
supply from another battery.
- Even in case of a minor collision where the srs does not deploy,
the horn button assembly, the
instrument panel passenger airbag assembly, the front seat airbag assembly
and the seat belt
pretensioner should be inspected (s 60–14, 60–26, 60–32 and 61–9).
- Never use srs related parts from another vehicle. When replacing
parts, replace them with new
parts.
- Before repairs, remove the airbag sensor if shocks are likely to be
applied to the sensor during
repairs.
- Never disassemble and repair the airbag sensor assembly, the horn
button assembly, the instrument
panel passenger airbag assembly, the front seat airbag assembly or the seat
belt pretensioner.
- If the airbag sensor assembly, the side airbag sensor assembly,
the horn button assembly, the
instrument panel passenger airbag assembly, the front seat airbag assembly
or the seat belt pretensioner
have been dropped, or if there are cracks, dents or other defects in the
case, bracket
or connector, replace them with new ones.
- Do not directly expose the airbag sensor assembly, the horn button
assembly, the instrument
panel passenger airbag assembly, the front seat airbag assembly or the seat
belt pretensioner
to hot air or flames.
- Use a volt/ohmmeter with high impedance (10 kw/v minimum) for
troubleshooting of an electrical
circuit.
- Information labels are attached to the srs components. Follow the
instructions on the notices.
- After work on the supplemental restraint system is completed,
check the srs warning light
- Spiral cable (in combination switch)
- the steering wheel must be fitted correctly to the
steering column with the spiral cable at the neutral
position, otherwise cable disconnection and other
troubles may occur. Refer to page 60–22 on this
manual concerning the correct installation of the
steering wheel.
- Horn button assembly (with airbag)
- when removing the horn button assembly or handling a new horn
button, it should be placed with
the pad top surface facing upward. Placing it with the pad surface facing
downward may lead
to a serious accident if the airbag accidentally inflates. Also, do not
place the horn button on top
of one another.
- Never measure the resistance of the airbag squib (this may cause
the airbag to inflate, which
is very dangerous).
- Grease should not be applied to the horn button assembly, and the
pad should not be cleaned
with detergents of any kinds.
- Store the horn button assembly where the ambient temperature
remains below 93 °C (200°f),
without high humidity and away from electrical noise.
- When using electric welding, first disconnect the airbag connector
(4 yellow pins) under the steering
column near the combination switch connector before starting work.
- When disposing of the vehicle or the horn button assembly alone,
the airbag should be deployed
using an sst before disposal .
Perform the operation in a safe place away from electrical noise.
- Instrument panel passenger airbag assembly
- always store a removed or new instrument panel passenger 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 inflates.
- Never measure the resistance of the airbag squib (this may cause
the airbag to inflate, which
is very dangerous).
- Grease should not be applied to the instrument panel passenger
airbag assembly, and the airbag
door should not be cleaned with detergents of any kind.
- Store the airbag assembly where the ambient temperature remains
below 93 °C (200°f), without
high humidity and away from electrical noise.
- When using electric welding, first disconnect the airbag connector
(4 yellow pins) installed on the
assembly before starting work.
- When disposing of a vehicle or the airbag assembly alone, the
airbag should be deployed using
an sst before disposal .
Perform the operation in a safe place away from electrical noise.
- Front seat airbag assembly
- always store 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 inflates.
- Never measure the resistance of the airbag squib (this may cause
the airbag to inflate, which
is very dangerous).
- Grease should not be applied to the front seat airbag assembly,
and the airbag door should not
be cleaned with detergents of any kind.
- Store the airbag assembly where the ambient temperature remains
below 93 °C (200°f), without
high humidity and away from electrical noise.
- When using electric welding, first disconnect the airbag connector
(2 yellow pins) installed on the
assembly before starting work.
- When disposing of a vehicle or the side airbag assembly alone, the
airbag should be deployed
using an sst before disposal .
Perform the operation in a safe place away from electrical noise.
- Seat belt pretensioner
- never measure the resistance of the seat belt pretensioner (this may
cause the seat belt pretensioner
to activate, which is very dangerous).
- Never disassemble the seat belt pretensioner.
- Never install the seat belt pretensioner to another vehicle.
- Store the seat belt pretensioner where the ambient temperature
remains below 80 °C (176°f)
without high humidity and away from electrical noise.
- When using electric welding, first disconnect the connector (2
yellow pins) before starting work.
- When disposing of a vehicle or the seat belt pretensioner alone,
the seat belt pretensioner should
be activated before disposal . Perform the operation in a
safe place away from
electrical noise.
- The seat belt pretensioner is hot after activation, so let it cool
down sufficiently before disposal.
Never apply water to cool down the seat belt pretensioner.
- Oil or water should not be put on the front seat outer belt, and
the front seat outer belt should
not be cleaned with detergents of any kind.
- Airbag sensor assembly
- never reuse the airbag sensor assembly involved in a collision
where the srs has deployed.
- The connectors to the airbag sensor assembly should be connected
or disconnected with the
sensor mounted on the floor. If the connectors are connected or disconnected
while the airbag
sensor assembly is not mounted to the floor, it could cause an undesired
ignition of the supplemental
restraint system.
- Work must be started after 90 seconds from the time the ignition
switch is turned to the ”lock”
position and the negative (–) terminal cable is disconnected from the
battery, even if only loosening
the set bolts of the airbag sensor assembly.
- Wire harness and connector
- the srs wire harness is integrated with the instrument panel wire
harness assembly. All the connectors
in the system are in a standard yellow color. If the srs wire harness
becomes disconnected
or the connector becomes broken due to an accident, etc., Repair or replace
it.
(A) hints on operations
1
Looks
Always wear a clean uniform.
Hat and safety shoes must be worn.
2
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Install the stop lamp switch assy.
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Jack up front side of the vehicle.
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Definition of terms
Term
Definition
Monitor description
Description of what the ecm monitors and how it detects malfunction
(monitoring purpose and its details).
Related dtcs
Diagnostic code
Typical enabling condition
Preconditions that allow the ecm to detect m ...