Lexus SC300 / Lexus SC400. Manual — part 57
REPLACEMENT REQUIREMENTS
In the following cases, replace the front airbag sensor.
NOTICE: For replacement of the front airbag sensor, see page
, “REMOVAL AND
INSTALLATION”.
•
If the airbag has been deployed in a collision.
(Replace both the left and right airbag sensors.)
•
If the front airbag sensor has been found to be faulty in troubleshooting.
•
If the front airbag sensor has been found to be faulty during the check in item 2–(b).
•
If the front airbag sensor has been dropped.
Center Airbag Sensor Assembly
INSPECTION ITEMS
1.
VEHICLES NOT INVOLVED IN A COLLISION
•
Perform a diagnostic system check (See page
VEHICLES INVOLVED IN A COLLISION
IF THE AIRBAG IS NOT DEPLOYED
•
Perform a diagnostic system check (See page
IF THE AIRBAG IS DEPLOYED
•
Replace the airbag sensor assembly certainly.
AB–11
SRS
AIRBAG – Inspection Items and Replacement Requirements
Wire Harness and Connector
HINT: The wires for the airbag wire harness are encased in a yellow corrugated tube and all the connectors in
the system are a standard yellow color.
INSPECTION ITEMS
1.
VEHICLES NOT INVOLVED IN A COLLISION
•
Perform a diagnostic system check (See page
2.
VEHICLES INVOLVED IN A COLLISION
(a) Perform a diagnostic system check (See page
).
(b) If there is a break in any of the wires in the airbag system wire harness, or if conductors are exposed.
(c) If the airbag system wire harness connectors are cracked or chipped.
REPLACEMENT REQUIREMENTS
In the following cases, replace the wire harness or connector.
•
If any part of the airbag system wire harness or any connector has been found to be faulty in trouble-
shooting.
•
If any part of the airbag system wire harness or any connector has been found to be faulty during the
check in item 2–(b) or (c).
NOTICE: If the wire harness used in the airbag system is damaged, replace the whole wire harness
assembly.
When the connector to the airbag front sensors can be repaired alone (when there is no damage
to the wire harness), use the repair wire specially designed for the purpose (See page
AB–12
SRS
AIRBAG – Inspection Items and Replacement Requirements
PREPARATION
SST (SPECIAL SERVICE TOOLS)
09082–00700
SRS
Airbag
Deployment Tool
09213–31021
Crankshaft Pulley
Puller
09843–18020
Diagnosis Check
Wiring
Steering wheel
RECOMMENDED TOOLS
09042–00010
Torx Socket
T30
09042–00020
Torx Socket
T30
09082–00015
TOYOTA
Electrical Tester
Center airbag sensor assembly
Steering wheel pad
EQUIPMENT
Part Name
Note
Torque wrench
AB–13
SRS
AIRBAG – Preparation
REMOVAL AND INSTALLATION OF
COMPONENT PARTS
Steering Wheel Pad and Spiral Cable
Removal and install the parts as shown.
(MAIN POINTS OF REMOVAL AND
INSTALLATION)
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the LOCK position and the negative (–) terminal
cable is disconnected from the battery (See page
).
NOTICE:
•
If the wiring connector of the airbag system is discon-
nected with the ignition switch at ON or ACC, diagnostic
codes will be recorded.
•
Never use airbag parts from another vehicle. When re-
placing parts, replace with new parts.
1.
REMOVE STEERING WHEEL PAD
(a) Remove negative terminal (–) from the battery.
(b) Place the front wheels facing straight ahead.
(c) Using a torx wrench, loosen the four screws.
Torx wrench: T30 (Part No. 09042–00010 or locally manufac-
tured tool)
(d) Loosen the torx screws until the groove along the screw
circumference catches on the screw case.
AB–14
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AIRBAG – Removal and Installation of Component Parts
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