Lexus SC300 / Lexus SC400. Manual — part 776
NG
OK
HINT: If the diagnostic trouble code is continuously displayed, perform the following troubleshooting.
1
Check resistance between terminal Tc of center airbag sensor assembly and body ground.
C
OK
P
1.
Turn ignition switch LOCK.
2.
Disconnect center airbag sensor assembly con-
nector.
3.
Disconnect battery negative (–) terminal cable, and
wait at least 90 seconds.
4.
Remove steering wheel pad (See page
.
5.
Disconnect connectors of front passenger airbag
assembly (See page
Check resistance between terminal Tc of center airbag
sensor assembly and body ground.
Resistance:
1 M
or higher
Replace center airbag sensor assembly.
Repair or replace harness or connector.
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
RS–125
SERVICE SPECIFICATIONS
SERVICE DATA
RS02S–01
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
FRONT AIRBAG SENSOR
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
S –
A
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
755–855
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
S –
S
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
1 M
or Higher
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
S –
A
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Less than 1
TORQUE SPECIFICATIONS
RS02T–07
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Part tightened
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
N
⋅
m
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
kgf
⋅
cm
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ft
⋅
lbf
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Steering wheel
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
35
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
360
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
26
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Steering wheel pad
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
7.4
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
75
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
65 in.
⋅
lbf
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Front passenger airbag assembly
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
21
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
210
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
15
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Front airbag sensor
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
25
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
260
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
19
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Center airbag sensor assembly
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
15
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
150
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
11
RS–126
–
SUPPLEMENTAL RESTRAINT SYSTEM
SERVICE SPECIFICATIONS
SUPPLEMENTAL RESTRAINT SYSTEM
RS–1
GENERAL DESCRIPTION
The LEXUS SC400/300 is equipped with an SRS (Supplemental Restraint System) such as the driver
airbag and front passenger airbag. Failure to carry out service operations in the correct sequence
could cause the SRS to unexpectedly deployed during servicing, possibly leading to a serious acci-
dent. Further, if a mistake is made in servicing the supplemental restraint system, it is possible the
SRS may fail to operate when required. Before performing servicing (including removal or installa-
tion of parts, inspection or replacement), be sure to read the following items carefully, then follow
the correct procedure described in the repair manual.
1. 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 inspect the diagnostic trouble codes before
disconnecting the battery (See page
2.
Work must be started after 90 seconds from the time the ignition switch 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 that if work is started within 90 seconds of
disconnecting the negative (–) terminal cable of the battery, the SRS may be deployed.)
When the negative (–) terminal cable is disconnected from the battery, memory of the clock and audio sys-
tems will be canceled. So before starting work, make a record of the contents memorized by the audio
memory system. When work is finished, reset the audio systems as before and adjust the clock. When the
vehicle has power tilt and power telescopic steering, power seat, power outside rear view mirror and power
shoulder belt anchorage, which are all equipped with memory function, it is not possible to make a record
of the memory contents. So when the work is finished, it will be necessary to explain this fact to the custom-
er, and ask the customer to adjust the features and reset the memory.
To avoid erasing the memory of each memory system, never use a back–up power supply from outside
the vehicle.
3.
Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger
airbag assembly, front airbag sensors and center airbag sensor assembly should be inspected (See pages
4.
Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
5.
Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensors during repairs.
6. Never disassemble and repair the steering wheel pad, front passenger airbag assembly, front airbag
sensors or center airbag sensor assembly in order to reuse it.
7.
If the steering wheel pad, front passenger airbag assembly, front airbag sensors or center airbag sensor
assembly have been dropped, or if there are cracks, dents or dents or other defects in the case, bracket
or connector, replace them with new ones.
8.
Do not expose the steering wheel pad, front passenger airbag assembly, front airbag sensors and center
airbag sensor assembly directly to hot air or flames.
9.
Use a volt/ohmmeter with high impedance (10 k
/V minimum) of troubleshooting of the system’s electrical
circuit.
10. Information labels are attached to the periphery of the SRS components. Follow the instructions on the
notices.
11. After work on the supplemental restraint system is completed, perform the SRS warning light check (See
page
).
12. If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section.
RS–2
–
SUPPLEMENTAL RESTRAINT SYSTEM
GENERAL DESCRIPTION
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