SRS AIRBAG
PRECAUTION
NOTICE:
The LEXUS LX450 is equipped with an SRS , which comprises a driver airbag and a front passenger
airbag. Failure to carry out service operations in the correct sequence could cause the
SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Further,
if a mistake is made in servicing the SRS, it is possible the SRS may fail to operate when required.
Before performing 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 the repair manual.
Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important
source of information when troubleshooting. When troubleshooting the SRS, always inspect
the DTCs before disconnecting the battery.
Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front
passenger airbag assembly, and airbag sensor assembly should be inspected.
(See pages RS–9, RS–23 and RS–35)
Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
Never disassemble and repair the steering wheel pad, front passenger airbag assembly, or airbag
sensor assembly in order to reuse it.
If the steering wheel pad, front passenger airbag assembly or airbag sensor assembly have
been dropped, or if there are cracks, dents or other defects in the case, bracket or connector,
replace them with new ones.
Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting the system’s
electrical circuits.
Information labels are attached to the periphery of the SRS components. Follow the instructions
on the notices.
After work on the SRS is completed, check the SRS warning light. (See page DI–227)
If the vehicle is equipped with a mobile communication system, refer to the precaution in the
IN section.
CAUTION:
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 SRS 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, the memory of the clock
and audio system will be canceled. So before starting work, make a record of the contents memorized
in the audio memory system. When work is finished, reset the audio systems as they
were before and adjust the clock. To avoid erasing the memory of each memory system, never
use a back–up power supply from outside the vehicle.
Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during
repairs.
Do not expose the steering wheel pad, front passenger airbag assembly, or airbag sensor assembly
directly to hot air or flames.
REMOVAL
NOTICE:
Do not open the cover or the case of the ECU and various
computers unless absolutely necessary.
(If the IC terminals are touched, the IC may be destroyed by
static electricity.)
1. REMOVE THESE PARTS:
(a) Transfer shirt knob
(b) Front console box
2. REMOVE AIRBAG SENSOR ASSEMBLY
(a) Disconnect the connector.
NOTICE:
Remove the connector with the sensor assembly installed.
(b) Using a torx wrench remove the 4 screws and the airbag
sensor assembly.
Torx wrench: T40 (Part No. 09042–00020 or locally
manufactured tool)
INSTALLATION
NOTICE:
Never use SRS parts from another vehicle. When replacing parts, replace with new parts.
Never reuse the airbag sensor assembly involved in a collision when the airbag has deployed.
Never repair a sensor in order to reuse it.
1. INSTALL AIRBAG SENSOR ASSEMBLY
(a) Using a torx wrench, install the airbag sensor assembly with the 4 screws.
Torx wrench: T40 (Part No. 09042–00020 or locally manufactured tool)
Torque: 21 N·m (210 kgf·cm, 15 ft·lbf)
(b) Connect the connector.
NOTICE:
Installation of the connector is done with the sensor assembly installed.
Make sure the sensor assembly is installed to the specified torque.
If the sensor assembly has been dropped, or there are cracks, dents or other defects in the
case, bracket or connector, replace the sensor assembly with a new one.
When installing the sensor assembly, take care that the SRS wiring does not interfere with other
parts and is not pinched between other parts.
After installation, shake the sensor assembly to check that there is no looseness.
2. INSTALL THE REMOVED PARTS
"Ok, now cut the red wire...... There is no red wire!!!!" 
