Lexus SC300 / Lexus SC400. Service manual — part 220
Parts Inspection
– Interior Lights
(Integration Relay)
REMOVAL AND INSTALLATION OF
INTEGRATION RELAY
(See page
INSPECTION OF INTEGRATION RELAY
INSPECT INTEGRATION RELAY
(Relay Circuit/Illuminated Entry System)
Remove the relay from junction block and inspect the con-
nector on the junction block side as shown in the chart.
Check for
Tester connection
Condition
Specified value
Continuity
A1–Ground
Driver’s or passenger’s courtesy
OFF (Door closed)
No continuity
y
A1–Ground
g
y
switch
ON (Door opened)
Continuity
A4–Ground
Passenger’s courtesy switch
OFF (Door closed)
No continuity
A4–Ground
Passenger’s courtesy switch
ON (Door opened)
Continuity
A6–Ground
Driver’s courtesy switch
OFF (Door closed)
No continuity
A6–Ground
Driver’s courtesy switch
ON (Door opened)
Continuity
A10–Ground
Constant
Continuity
Voltage
A1–Ground
Constant
*Battery voltage
g
A2–Ground
Constant
*Battery voltage
A10–Ground
Interior light switch
ON
*Battery voltage
A10–Ground
Interior light switch
OFF
No voltage
*: There is resistance because this circuit is grounded through the bulb.
If the circuit is as specified, try replacing the relay with a new
one.
If the circuit is not as specified, refer to
and inspect the circuits connected to other parts.
BE–78
–
BODY ELECTRICAL SYSTEM
Lighting System
(Courtesy Switch)
REMOVAL AND INSTALLATION OF
COURTESY SWITCH
1.
REMOVE COURTESY SWITCH
(a) Remove door lock assembly.
(See page
(b) Remove a screw.
(c) Remove courtesy switch from door lock assembly.
2.
INSTALL COURTESY SWITCH
For installation, follow the removal procedure in reverse.
INSPECTION OF COURTESY SWITCH
INSPECT COURTESY 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
Continuity
6–Ground
Constant
Continuity
Voltage
3–Ground
Constant
Battery voltage
If circuit is not as specified, inspect power source or wire
harness.
–
BODY ELECTRICAL SYSTEM
Lighting System
BE–79
(Front Personal Light Switch)
REMOVAL AND INSTALLATION OF
FRONT PERSONAL LIGHT
1.
REMOVE FRONT PERSONAL LIGHT
(a) Release eight tabs and remove the lens.
(b) Remove three screws and separate front personal light.
(c) Disconnect connector and remove front personal light.
2.
INSTALL FRONT PERSONAL LIGHT
For installation, follow the removal procedure in reverse.
INSPECTION OF FRONT PERSONAL
LIGHT
INSPECT FRONT PERSONAL LIGHT SWITCH
(Continuity)
Inspect the light switch continuity between terminals.
If continuity is not as specified, replace the light assembly or
bulb.
(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
3–Ground
Constant
Battery voltage
Continuity
1–Ground
Constant
Continuity
If circuit is not as specified, inspect power source or wire
harness.
BE–80
–
BODY ELECTRICAL SYSTEM
Lighting System
(Vanity Light Switch)
REMOVAL AND INSTALLATION OF
VANITY LIGHT SWITCH
1. REMOVE
VANITY
LIGHT
(a) Release two tabs and remove the lens.
(b) Remove two screws and separate the vanity light from
sun visor.
(c) Disconnect connector and remove vanity light.
2.
INSTALL VANITY LIGHT
For installation follow the removal procedure in reverse.
INSPECTION OF VANITY LIGHT
INSPECT VANITY LIGHT SWITCH
(Continuity)
Inspect the vanity light continuity between terminals.
If continuity is not as specified, replace bulb or vanity light.
(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
1–Ground
Constant
Battery positive voltage
Continuity
2–Ground
Constant
Continuity
If circuit is not as specified, inspect power source or wire har-
ness.
–
BODY ELECTRICAL SYSTEM
Lighting System
BE–81
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