Lexus RX300 (MCU15). Service 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.