Lexus SC300 / Lexus SC400. Manual — part 216
INSPECTION OF STOP LIGHT SWITCH
INSPECT STOP LIGHT SWITCH
(Continuity)
Inspect the switch continuity between terminals.
If continuity is not as specified, replace the switch.
(Switch Circuit)
Disconnect the connector from the switch and inspect the
connector on the wire harness side as shown.
Check for
Tester connection
Condition
Specified value
Voltage
2–Ground
Constant
Battery voltage
If circuit is not as specified, inspect power source or wire har-
ness.
(Light Failure Sensor)
REMOVAL AND INSTALLATION OF
LIGHT FAILURE SENSOR
1.
REMOVE LIGHT FAILURE SENSOR
(a) Remove luggage front trim cover.
(b) Remove a clip and disconnect connector.
(c) Remove light failure sensor.
2.
INSTALL LIGHT FAILURE SENSOR
For installation, follow the removal procedure in reverse.
BE–62
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BODY ELECTRICAL SYSTEM
Lighting System
INSPECTION OF LIGHT FAILURE
SENSOR
INSPECT LIGHT FAILURE SENSOR
(Relay Circuit)
Disconnect the connector from the sensor and inspect the
connector on the wire harness side as shown.
Check for
Tester connection
Condition
Specified value
Continuity
1–Ground
Constant
*Continuity
2–Ground
Constant
*Continuity
3–Ground
Constant
*Continuity
9–Ground
Constant
*Continuity
11–Ground
Constant
Continuity
Voltage
3–Ground
Tail or Head
OFF
No voltage
ON
Battery voltage
4–Ground
Ignition switch
LOCK or ACC
No voltage
ON
Battery voltage
7–Ground
Stop light switch
OFF
No voltage
ON
Battery voltage
Voltage
8–Ground
Ignition switch
LOCK or ACC
No voltage
ON
Battery voltage
*: There is resistance because this circuit is grounded through the bulb
*: There is resistance because this circuit is grounded through the bulb.
If circuit is as specified, replace the sensor. If the circuit is not
as specified, refer to
wiring diagram and inspect the
circuits connected to other parts.
–
BODY ELECTRICAL SYSTEM
Lighting System
BE–63
Troubleshooting
Stop Light System
You will find the cause of trouble more easily using the table shown. In this table, the numbers indicate the order
priority of the causes in trouble. Check each part in the order shown. If necessary, replace the parts.
See page
Part
name
Trouble
Stop light does not light up.
Stop light always lights up.
Only one light always lights up.
Only one light does not light up.
BE–4
, 20
BE–61
BE–62
BE–6
ST
OP Fuse
Stop Light Switch
Light Failure Sensor
Wire Harness
Bulb
BE–64
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BODY ELECTRICAL SYSTEM
Lighting System
(TURN SIGNAL AND HAZARD WARNING
LIGHT SYSTEM)
Description – TURN SIGNAL AND
HAZARD WARNING LIGHT SYSTEM
The component parts of this system and their function are as shown in the following table.
Parts Name
Function
Turn Signal Switch
Switches current from the turn signal flasher to the left side or right side.
Hazard Warning
Switch
Modifies the circuit to the flasher relay and turn signal switch in accordance with the
respective switch positions.
Turn Signal Flasher
Receives current from the hazard warning switch and flashes the turn signal lights by
switching the current to the lights ON and OFF.
PARTS LOCATION – TURN SIGNAL
–
BODY ELECTRICAL SYSTEM
Lighting System
BE–65
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