lock LEXUS SC400 1991 Service Repair Manual

1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROMBATTERY
CAUTION: Work must be started after 90 second from the
time the ignition switch is turned to the LOCK position
and the negative (±) terminal cable is disconnected from
the battery (See page RS±2).
2. REMOVE NO. 2 INSTRUMENT PANEL UNDER COVER
(a) Using a clip remover, remove 2 clips.
(b) Remove the under cover.
3. DISCONNECT AIRBAG CONNECTER
(a) Remove the glove compartment door finish plate inside the glove compartment.
NOTICE: When handling the airbag connector, take care
not to damage the airbag wire harness.
(b) Pull up the connector.
(c) Disconnect the airbag connector.
4. REMOVE GLOVE COMPARTMENT ASSEMBLY
(a) Remove the 2 console box hole covers.
(b) Remove the 4 screws and clip.
(c) Remove the glove compartment assembly.
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SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLYRS±31
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5. REMOVE GLOVE COMPARTMENT DOOR LOCKMOUNTING BRACKET
Remove the 2 screws, disconnect the door lock mounting
bracket.
(a) Remove the 3 screws, 2 nuts and bolt.
6. REMOVE FRONT PASSENGER AIRBAG ASSEMBLY
(b) Pull out the front pass enger airbag assembly from the
instrument panel.
NOTICE: When removing the front passenger airbag as-
sembly, take care not to pull the airbag wire harness.
CAUTION:
w When storing the front passenger airbag assembly, keep
the upper surface of the front passenger airbag assembly
facing upward.
w Never disassemble the front passenger airbag assembly.
7. INSTALL FRONT PASSENGER AIRBAG ASSEMBLY
(a) Install and torque the 2 nuts and the bolt.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
(b) Install the 3 screws.
NOTICE:
w Make sure the front passenger airbag assembly is
installed to the specified torque.
w If the front passenger airbag assembly has been
dropped, or there are cracks, dents or other defects in the
case or connector, replace the front passenger airbag
assembly with a new one.
w When installing the front passenger airbag assembly,
take care that the wiring do not interfere with other parts
and are not pinched between other parts.
RS±32±
SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLY
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8. INSTALL FOLLOWING PARTS:
(a) Glove compartment door lock mounting bracket
(b) Glove compartment assemblyNOTICE: When installing the glove compartment assem-
bly, carefully pull out the airbag wire harness from the
glove compartment upper hole.
(c) Airbag connector
(d) Glove compartment door finish plate
(e) No.2 instrument panel under cover
9. CONNECT NEGATIVE (±) TERMINAL CABLE TO BATTERY
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SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLYRS±33
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When scrapping vehicle
HINT: Have a battery ready as the power source to deploy the
airbag.
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROM THE BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the LOCK posi-
tion and the negative (±) terminal cable is disconnected
from the battery (See page RS±2).
2. DISCONNECT AIRBAG CONNECTOR
(a) Remove the glove compartment door finish plate inside the glove compartment.
NOTICE: When handling the airbag connector, take care
not to the airbag wire harness.
(b) Pull up the connector.
(c) Disconnect the airbag connector.
3. CONFIRM FUNCTIONING OF SST (See page RS±27)
SST 09082±00700
4. INSTALL SST
(a) Connect the SST connector to the front passenger airbag assembly connector.
NOTICE: To avoid damaging the SST connector and wire
harness, do not lock the secondary lock of the twin lock.
SST 09082±00700
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SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLYRS±35
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When disposing of front passenger
airbag assembly only
When disposing of the front passenger airbag assembly
only, never use the customer's vehicle to deploy the air-
bag.
Remove the front passenger airbag assembly from the ve-
hicle and be sure to follow the procedure given below when
deploying the airbag.
HINT: Have a battery ready as the power source to deploy the
airbag.
1. REMOVE FRONT PASSENGER AIRBAG ASSEMBLY CAUTION:
w When removing the front passenger airbag assembly,
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.
w Store the front passenger airbag assembly with the
airbag door facing up.
2. FIX FRONT PASSENGER AIRBAG ASSEMBLY TO TIRE
Using a service±purpose wire harness for vehicle, tie down
the front passenger airbag assembly to the tire.
Wire harness: Stripped wire harness section
1.25 mm
2 or more (0.0019 in2 or more).
HINT: To calculate the square of the stripped wire harness
section±
Square = 3.14 x (Diameter)2 divided by 4
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SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLYRS±37
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4. PLACE TIRES
(a) Place at least 2 tires under the tire to which the front
passenger airbag assembly is tied.
(b) Place at least 2 tires over the tire to which the front passenger
airbag assembly is tied. The top tire should have the wheel
installed.
(c) Tie the tires together by 2 wire harnesses. CAUTION: Make sure that the wire harnesses are tight. It
is very dangerous if looseness in the tires coming free
through the shock of the airbag deploying.
HINT: Place the SST connect and wire harness inside tires.
Provide at least 1 m (3 ft) of slack for the wire harness.
5. INSTALL SST Connect the SST connector to the front passenger airbag as-
sembly connector.
SST 09082±00700
NOTICE: To avoid damaging the SST connector and wire
harness, do not lock the secondary lock of the twin lock.
6. AIRBAG DEPLOYMENT
(a) Connect the SST red clip to the battery positive (+) terminal and the black clip to the battery negative (±) terminal.
(b) Confirm that no±one is within 10 m (33 ft) of the tire the front passenger airbag assembly is tied to.
(c) Press the SST activation switch and deploy the airbag.
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SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLYRS±39
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1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROMBATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the ªLOCKº posi-
tion and the negative (±) terminal cable is disconnected
from the battery.
(See page RS±2)
2. REMOVE ENGINE UNDER COVER
(See page BO±12)
3. REMOVE FRONT AIRBAG SENSOR
(a) Disconnect the connector.
(b) Remove the bolt, the nut and the sensor.
4. INSTALL FRONT AIRBAG SENSOR
(a) Install the sensor with the arrow on the sensor facing toward the front of the vehicle.
Torque: 25 N Vm (260 kgf Vcm, 19 ft Vlbf)
NOTICE:
w Make sure the sensor is installed to the specified torque.
w If the sensor has been dropped, or there are cracks, dents
or other defects in the case, brackets or c onnector,
replace the sensor is removed, always replace the set bolt
and the nut with new one.
w The sensor set bolt and the nut have been anti±rust
treated. When the sensor is removed, always replace the
set bolt and the nut with new ones.
w After installation, shake the sensor to check that there is
no looseness.
w The front sensor is equipped with an electrical
connection check mechanism. Be sure to lock this
mechanism securely when connecting the connector. If
the connector is not securely locked, a malfunction code
will be detected by the diagnosis system.
w Check that the dimensions of the body where the front
airbag sensor is installed match those in the body
dimension drawings in the BODY section.
(The SRS may malfunction, or may not work, if the
dimensions of the sensor mount is not correct.)
5. INSTALL ENGINE UNDER COVER
6. CONNECT NEGATIVE (±) TERMINAL CABLE TO BATTERY
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SUPPLEMENTAL RESTRAINT SYSTEM FRONT AIRBAG SENSORRS±43
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CENTER AIRBAG SENSOR ASSEMBLY
REMOVAL AND INSTALLATION
RS049±01
NOTICE:
wDo 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.)
w Never use SRS parts from another vehicle. When
replacing parts, replace with new parts.
w Never reuse the center airbag sensor assembly involved
in a collision when the airbag has deployed.
w Never repair a sensor in order to reuse it.
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROM
BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the LOCK posi-
tion and the negative (±) terminal cable is disconnected
from the battery (See page RS±2).
2. REMOVE AND INSTALL CENTER AIRBAG SENSOR ASSEMBLY
(a) Using a torx wrench, loosen and tighten the 3 screws.
Torx wrench: T40 (Part No. 09042±00020 or locally manufac-
tured tool)
(b) Disconnect and connect the connector. NOTICE: Removal and installation of the connector is
done with the sensor assembly installed.
(c) Using a torx wrench, tighten the 3 screws. Torx wrench: T40 (Part No. 09042±00020 or locally manufac-
tured tool)
Torque: 15 N Vm (150 kgf Vcm, 11 ft Vlbf)
NOTICE:
w Make sure the sensor assembly is installed to the
specified torque.
w 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.
w When installing the sensor assembly, take care that the
airbag wiring does not interfere with other parts and is
not pinched between other parts.
w After installation, shake the sensor assembly to check
that there is no looseness.
RS±46±
SUPPLEMENTAL RESTRAINT SYSTEM CENTER AIRBAG SENSOR ASSEMBLY
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REPLACEMENT REQUIREMENTS
RS01D±07
In the following cases, replace the wire harness or connector.
wIf any part of the SRS wire harness or any connector has
been found to be faulty in troubleshooting.
w If any part of the SRS wire harness or any connector has
been found to be faulty during the check in items 2±(b)
or (c).
NOTICE:
w If the wire harness used in the SRS is damaged, replace
the whole wire harness assembly.
w When the connector to the WIRE HARNESS AND CON-
NECTORs can be repaired alone (when there is no
damage to the wire harness), use the repair wire specially
designed for the purpose.
SENSOR REPLACEMENT
REPAIR WIRE FOR FRONT AIRBAG
RS04A±01
Repair wire with 2 pressure±contact sleeves
(Part No. 82988±24010) has been prepared for exclusive
use in repairing connector damage etc. caused by frontal col-
lision of the vehicle.
When repairing the WIRE HARNESS AND CONNECTOR
connector on the wire harness side, always use the special
repair wire.
NOTICE: Do not replace the connector housing or termi-
nal only.
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROM
BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the ªLOCKº posi-
tion and the negative (±) terminal cable is disconnected
from the battery.
(See page RS±2)
2. DISCONNECT WIRE HARNESS AT VEHICLE SIDE
(a) Remove the cover at the rear of the connector housing and expose the wire harness.
(b) Cut the wire harness behind the connector housing. HINT: The operation is performed more easily if the wire har-
ness is left as long as possible.
RS±48
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SUPPLEMENTAL RESTRAINT SYSTEM WIRE HARNESS AND CONNECTOR
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TROUBLESHOOTING
 HOW TO PROCEED WITH 
 TROUBLESHOOTING RS±54 CUSTOMER PROBLEM ANALYSIS CHECK SHEET RS±58 DIAGNOSIS INSPECTION RS±59 SYMPTION SIMULATION RS±65 DIAGNOSTIC TROUBLE CODE MATRIX CHART RS±67 PROBLEM SYMPTOM CHART RS±67 CIRCUIT INSPECTION RS±68 DTC (Normal) RS±68 DTC 11 RS±70 DTC 12 RS±78 DTC 13 RS±85 DTC 14 RS±92 DTC 15 RS±97 DTC 22 RS±102 DTC 31 RS±108 DTC 53 RS±110 DTC 54 RS±115 SRS Warning Light System (Always Lit Up, when ignition switch is Lock position) RS±119 Tc Terminal Circuit RS±121
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SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTINGRS±53
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