Lexus RX300 (MCU15). Manual — part 126
I08168
ON
OFF
I04058
Wire Harness Side
1
2
–
BODY ELECTRICAL
INTERIOR LIGHT SYSTEM
BE–51
LEXUS RX300 (RM785E)
14.
INSPECT GLOVE COMPARTMENT DOOR LIGHT
SWITCH CONTINUITY
Switch position
Tester connection
Specified condition
OFF (closed)
–
No continuity
ON (opened)
1 – 2
Continuity
If continuity is not as specified, replace the switch.
15.
INSPECT GLOVE COMPARTMENT DOOR LIGHT CIR-
CUIT
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connection
Condition
Specified condition
2 – Ground
Constant
Continuity
1 – Ground
Light control switch OFF
No voltage
1 – Ground
Light control switch TAIL or HEAD
Battery voltage
If circuit is not as specified, inspect power source or wire har-
ness.
I19133
Stop Light Switch
Instrument Panel J/B
D STOP Fuse
High–mount Stop Light
Light Failure Sensor
Stop Light
BE059–05
BE–52
–
BODY ELECTRICAL
STOP LIGHT SYSTEM
LEXUS RX300 (RM785E)
STOP LIGHT SYSTEM
LOCATION
BE05A–04
I04062
2
1
4
3
Z06566
Wire Harness Side
1
2
3
4
eg–4–1
I07407
–
BODY ELECTRICAL
STOP LIGHT SYSTEM
BE–53
LEXUS RX300 (RM785E)
INSPECTION
1.
INSPECT STOP LIGHT SWITCH CONTINUITY
Switch position
Tester connection
Specified condition
Switch pin free
1 – 2
Continuity
Switch pin pushed in
3 – 4
Continuity
If continuity is not as specified, replace the switch.
2.
INSPECT STOP LIGHT SWITCH CIRCUIT
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side.
Tester connection
Condition
Specified condition
2 – Ground
Constant
Battery voltage
If circuit is not as specified, inspect the power source or wire
harness.
3.
INSPECT HIGH–MOUNTED STOP LIGHT ASSEMBLY
CONTINUITY
Using the ohmmeter, check that continuity exists between ter-
minals.
If continuity is not as specified, replace the bulb or light assem-
bly.
N21598
Wire Harness Side
1
2
e–2–1–J
I08151
Wire Harness Side
BE–54
–
BODY ELECTRICAL
STOP LIGHT SYSTEM
LEXUS RX300 (RM785E)
4.
INSPECT HIGH–MOUNTED STOP LIGHT ASSEMBLY
CIRCUIT
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side.
Tester connection
Condition
Specified condition
1 – Ground
Constant
Battery voltage
If circuit is not as specified, inspect the power source or wire
harness.
5.
INSPECT LIGHT FAILURE SENSOR CIRCUIT
Disconnect the connector from the sensor and inspect the con-
nector on the wire harness side.
Tester connection
Condition
Specified condition
1 – Ground
Constant
Continuity*
2 – Ground
Constant
Continuity*
9 – Ground
Constant
Continuity*
11 – Ground
Constant
Continuity
3 – Ground
Light control switch OFF
No voltage
3 – Ground
Light control switch TAIL or HEAD
Battery voltage
4 – Ground
Ignition switch LOCK or ACC
No voltage
4 – Ground
Ignition switch ON
Battery voltage
7 – Ground
Stop light switch OFF
No voltage
7 – Ground
Stop light switch ON
Battery voltage
8 – Ground
Ignition switch LOCK or ACC
No voltage
8 – Ground
Ignition switch ON
Battery voltage
*: There is resistance because this circuit is grounded through
the bulb.
If the circuit is as specified, replace the sensor.
If the circuit is not as specified, inspect the circuits connected
to other parts.
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