Lexus SC300 / Lexus SC400. Manual — part 139
ELECTRIC TENSION REDUCER
SYSTEM
Parts Location
Wiring and Connector Diagrams
–
BODY ELECTRICAL SYSTEM
Electronic Tension Reducer System
BE–167
Parts Inspection
(Tension Reducer Solenoid)
REMOVAL AND INSTALLATION OF
TENSION REDUCER SOLENOID
(See page
INSPECTION OF TENSION REDUCER
SOLENOID
INSPECT TENSION REDUCER SOLENOID
(Operation)
(a) Connect
the positive (+) lead from the battery to terminal
2, and negative (–) lead to terminal 1.
(b) Pull the belt upward and check that the belt is slowly
retracted when released.
(c) Disconnect the lead from the battery.
(d) Pull the belt upward and check that the belt is retracted
more quickly when released than in (b).
HINT: Do not tilt the retractor.
If the operation is not as specified, replace the front seat outer
belt assembly.
(Circuit)
Disconnect the tension reducer solenoid connector and in-
spect the connector on wire harness side as shown.
Check for
Tester connection
Condition
Specified value
Voltage
2–Ground
Ignition switch
ON
Battery voltage
g
g
position
ACC or LOCK
No voltage
Continuity
1–Ground
Buckle switch position
ON (belt fastened)
Continuity
y
OFF (belt unfastened)
No continuity
If the circuit is specified, replace the front seat outer belt as-
sembly.
If the circuit is not as specified, refer to
gram, and inspect the circuits connected to other parts.
BE–168
–
BODY ELECTRICAL SYSTEM
Electric Tension Reducer System
(Buckle Switch)
REMOVAL AND INSTALLATION OF
BUCKLE SWITCH
1.
REMOVE BUCKLE SWITCH
(a) Remove the driver or front passenger’s seat.
(b) Disconnect buckle switch connector.
(c) Remove seat belt inner with buckle switch.
2.
INSTALL BUCKLE SWITCH
For installation follow the removal procedure in reverse.
INSPECTION OF BUCKLE SWITCH
INSPECT BUCKLE SWITCH
(Switch Continuity)
(a) Check that there is continuity between terminals on the
switch side connector with the switch ON (belt
fastened).
(b) Check that there is no continuity between terminals on
the switch side connector with the switch OFF (belt
unfastened).
If operation is not as specified, replace the seat belt inner.
(Switch Circuit)
Disconnect the connector from switch and inspect the con-
nector on wire harness side as shown.
Check for
Tester connection
Condition
Specified value
Voltage
2–Ground
Ignition switch posi-
ON
Battery voltage
g
g
tion
ACC or LOCK
No voltage
Continuity
1–Ground
Constant
Continuity
If the circuit is not as specified, refer to
gram, and inspect the circuits connected to other parts.
–
BODY ELECTRICAL SYSTEM
Electric Tension Reducer System
BE–169
Troubleshooting
You will find the cause of trouble more easily properly using the table shown below. In this table, the numbers
indicate the order priority of the causes of trouble. Check each part in the order shown. If necessary, replace
the part.
See page
BE–4
,20
BE–168
BE–169
–
–
Trouble
Parts
name
GAUGE Fuse
T
ension Reducer Solenoid
Buckle Switch
Wire Harness
Tension Reducer does not operate.
(Driver’s and Passenger’s)
1
2
Tension Reducer does not operate. (Only one side)
2
1
3
BE–170
–
BODY ELECTRICAL SYSTEM
Electric Tension Reducer System
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