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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
- Curtain air bag module
- Front seat assembly incorporating side-airbag
module
- Seat belt with pre-tensioner and lap
pre-tensioner
- Front impact sensor
- Side impact sensor
- Knee air bag module
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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 → side-airbag module
(LH)
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Repair or
replace the floor wiring harness.
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3,
10
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Floor
wiring harness → side impact sensor
(LH)
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4,
5
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Floor
wiring harness → side-airbag module
(RH)
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6,
7
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Floor
wiring harness → side impact sensor
(RH)
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11,
12
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Floor
wiring harness → driver’s seat belt
pre-tensioner
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13,
14
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Floor
wiring harness → driver’s seat belt
lap pre-tensioner
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17,
18
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Floor
wiring harness → passenger’s (front)
seat belt lap pre-tensioner
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19,
20
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Floor
wiring harness → passenger’s (front)
seat belt pre-tensioner
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21
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Front
wiring harness → ETACS-ECU (fuse No.
21)
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Repair
or replace the instrument panel wiring
harness.
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22,
23
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Front
wiring harness → front wiring harness
→ front impact sensor (LH)
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Repair
or replace the wiring harnesses.
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27
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Front
wiring harness → ETACS-ECU (fuse No.
15)
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Repair or
replace the instrument panel wiring
harness.
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28
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Front
wiring harness → diagnosis
connector
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30
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Front
wiring harness → earth
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33,
34
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Front
wiring harness → CAN bus line
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36,
37
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Front
wiring harness → front wiring harness
→ front impact sensor (RH)
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Repair
or replace the wiring harnesses.
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38,
39
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Front
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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40,
41
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Front
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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42,
43
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Front
wiring harness → driver’s knee air
bag module
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44,
45
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Front
wiring harness→ roof wiring harness
→ curtain air bag module (RH)
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46,
47
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Front
wiring harness→ roof wiring harness
→ curtain air bag module (LH)
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5.Before maintenance,
wait for 60 seconds or more after disconnecting the
negative 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 ignition switch to
the "LOCK" (OFF) position <except vehicles with
KOS> or put the power supply mode is OFF
<vehicles with KOS>. 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, and 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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