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1.In order to avoid
injury to yourself or others from accidental deployment
of the SRS air bag during servicing, read and carefully
follow all the precautions and procedures described in
this manual.
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2.Be sure to use the
tester and special tools specified in this manual
(Special tool: refer to  ,
tester: refer to ).
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3.Never attempt to repair
the following components:
- SRS-ECU
- Driver’s air bag module
- Clock spring
- Passenger’s (front) air bag
module
- Seat belt with pre-tensioner
- Front impact sensor
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4.Never attempt to repair
the wiring harness connectors of the SRS. If a defective
wiring harness is found, repair or replace it by
referring to the table follows.
SRS-ECU terminal
No.
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Destination of wiring
harness
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Measures
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1,
2
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Floor
wiring harness → passenger’s seat
belt pre-tensioner
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Repair
or replace the floor wiring harness.
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3,
4
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Floor
wiring harness → driver’s seat belt
pre-tensioner
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Repair
or replace the floor wiring harness.
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7,
8
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Floor
wiring harness → lap
pre-tensioner
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Repair
or replace the floor wiring harness.
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11,
12
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Instrument panel wiring harness
→ passenger’s (front)
air bag module (squib)
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Repair
or replace the instrument panel wiring
harness.
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17,
18
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Instrument panel wiring harness
→ clock spring → driver’s
air bag module (squib)
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Replace
the clock spring, or repair or replace the
instrument panel
wiring harness.
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19
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Floor
wiring harness → Junction block (fuse No.
15)
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Repair or
replace the floor wiring harness.
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20
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Floor
wiring harness → Junction block (fuse No.
21)
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25,
26
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Instrument panel wiring harness
→ front wiring harness → front
impact sensor (CTR)
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27,
29
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Instrument panel wiring harness
→ CAN bus line
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Repair or
replace the instrument panel wiring
harness.
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30
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Instrument panel wiring harness
→ earth
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5.Before maintenance,
wait for 60 seconds or more after the disconnection of
the battery (-) terminal. Wrap the disconnected
(-) terminal with tape for insulation. The
condenser inside SRS-ECU keeps a voltage necessary to
expand the air bag for a certain period even after the
IG power is turned OFF. Therefore, if any operation is
performed before the period elapses, it may cause
serious damage.
6.If the influence of
heat is suspected during painting work, remove the
following parts:
- 93°C or higher SRS-ECU, air bag module,
clock spring, front impact sensor, side impact
sensor
- 90 °C or higher Seat belt with
pre-tensioner
7.After the maintenance of the SRS air bag
and seat belt with pre-tensioner is completed, be sure
to delete the diagnosis code and check whether the SRS
warning lamp lights up (refer to ).
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