1991 LEXUS SC400 Service Repair Manual

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Page 3105 of 4087

LEXUS SC400 1991 Service Repair Manual
SUPPLEMENTAL RESTRAINT SYSTEM
RS±1
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Page 3106 of 4087

$LEXUS SC400 1991 Service Repair Manual GENERAL DESCRIPTION The LEXUS SC400/300 is equipped with an SRS (Supplemental Restraint System\ ) such as the driver airbag and front passenger airbag. Failure to carry out service operations in \ th$

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 leadin\
g to a serious acci-
dent. Further, if a mistake is made in servicing the supplemental restraint system, i\
t is possible the
SRS may fail to operate when required. Before performing servicing (inc\
luding removal or installa-
tion of parts, inspection or replacement), be sure to read the followin\
g 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 RS±59).
2. Work must be started after 90 seconds from the time the ignition switch turn\
ed 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 sta\
rted 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 memo\
rized by the audio
memory system. When work is finished, reset the audio systems as before and ad\
just 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 inspe\
cted (See pages
RS±16 , 28 , 41 and 44).
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 r\
epairs.
6. Never disassemble and repair the steering wheel pad, front passenger airbag a\
ssembly, 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 ot\
her 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 RS±59 ).
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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Page 3107 of 4087

LEXUS SC400 1991 Service Repair Manual
STEERING WHEEL PAD (with AIRBAG)
RS00Q±07
1. When removing the steering wheel pad or handling a new steering wheel pad, it should be placedwith the pad top surface facing up.
In this case, the twin

Page 3108 of 4087

$LEXUS SC400 1991 Service Repair Manual SPIRAL CABLE (in COMBINATION SWITCH) RS00P±06 The steering wheel must be fitted correctly to the steering column with the\ spiral cable at the neutral posi- tion, otherwise cable disconnection and$

Page 3109 of 4087

$LEXUS SC400 1991 Service Repair Manual FRONT AIRBAG SENSOR RS00N±07 1. Never reuse the front airbag sensor involved in a collision when the airbag h\ as deployed. (Replace boththe left and right airbag sensors.) 2. Install the front ai$

Page 3110 of 4087

LEXUS SC400 1991 Service Repair Manual
DESCRIPTION
RS00S±02
The SRS (Supplemental Restraint System), together with the seat belt, is designed to help protect the driv-
er. Frontal inspect, the airbag sensor detect the shock, and if the f

Page 3111 of 4087

LEXUS SC400 1991 Service Repair Manual
RSOOU±02
WIRING DIAGRAM
±
SUPPLEMENTAL RESTRAINT SYSTEM DESCRIPTIONRS±7
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Page 3112 of 4087

LEXUS SC400 1991 Service Repair Manual
CENTER AIRBAG SENSOR ASSEMBLY CONNECTOR
RS00V±0B
No. Symbol Terminal Name A �

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