Lexus RX300 (MCU15). Service manual — part 125

I19168

Engine Room J/B
D DOME Fuse

Vanity Light

Vanity Light

Door Courtesy
Light

Glove Compartment
Door Courtesy Light

Glove Compartment
Door Courtesy Switch

Front Personal Light

Door Courtesy Switch

Door Courtesy Light

Front Interior Light

Rear Interior Light

Door Courtesy Switch

Back Door Courtesy Switch

BE057–05

–

BODY ELECTRICAL

INTERIOR LIGHT SYSTEM

BE–47

LEXUS RX300 (RM785E)

INTERIOR LIGHT SYSTEM

LOCATION

BE1YI–01

N21585

2 1

N21586

Wire Harness Side

1

2

N20157

2

Ohmmeter

N20158

2

1

Ohmmeter

Z05672

Wire Harness Side

1

2

GA–2–1–B

BE–48

–

BODY ELECTRICAL

INTERIOR LIGHT SYSTEM

LEXUS RX300 (RM785E)

INSPECTION

1.

INSPECT PERSONAL LIGHT SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

OFF

–

No continuity

ON

1 – 2

Continuity

If continuity is not as specified, replace the light assembly or
bulb.

2.

INSPECT PERSONAL 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

Continuity

1 – Ground

Constant

Battery voltage

If the circuit is as specified, inspect power source or wire har-
ness.

3.

INSPECT INTERIOR LIGHT SWITCH

(a)

Disconnect the connector from the dome lamp.

(b)

Turn the dome lamp switch ON, check that continuity ex-
ists between terminal 2 and body ground.

(c)

Turn the dome lamp switch DOOR, check that there is
continuity exists between terminal 1 and 2.

If operation is not as specified, replace the switch.

4.

INSPECT INTERIOR 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 the circuit is not as specified, inspect power source or wire
harness.

N17456

ON

OFF

2 1

N21587

Wire Harness Side

1 2

h–2–1–B

I19171

Open

Close

I19172

Wire Harness Side

I19173

Open

Close

–

BODY ELECTRICAL

INTERIOR LIGHT SYSTEM

BE–49

LEXUS RX300 (RM785E)

5.

INSPECT VANITY LIGHT CONTINUITY

Switch position

Tester connection

Specified condition

OFF (Closed)

–

No continuity

ON (Opened)

1 – 2

Continuity

If continuity is not as specified, replace the bulb or vanity light.

6.

INSPECT VANITY 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

Continuity

1 – Ground

Constant

Battery voltage

If the circuit is not as specified, inspect power source or wire
harness.

7.

INSPECT FRONT DOOR COURTESY SWITCH CONTI-
NUITY

(a)

Check that continuity exists between terminals 10 and 11
with the door lock open.

(b)

Check that no continuity exists between terminals 10 and
11 with the door lock closed.

If operation is not as specified, replace the door lock.
8.

INSPECT FRONT DOOR COURTESY SWITCH CIR-
CUIT

Disconnect the connector from the door lock assembly and
inspect the connector on the wire harness side.

Tester connection

Condition

Specified condition

10 – 11

Constant

Battery voltage

If the circuit is not as specified, inspect power source or wire
harness.

9.

INSPECT REAR DOOR COURTESY SWITCH CONTI-
NUITY

(a)

Check that continuity exists between terminals 1 and 5
with the door lock open.

(b)

Check that no continuity exists between terminals 1 and
5 with the door lock closed.

If operation is not as specified, replace the door lock.

I19174

Wire Harness Side

N21589

1

2

N21590

Wire Harness Side

e–2–1

1

2

I04052

2

1

BE–50

–

BODY ELECTRICAL

INTERIOR LIGHT SYSTEM

LEXUS RX300 (RM785E)

10.

INSPECT REAR DOOR COURTESY SWITCH CIRCUIT

Disconnect the connector from the door lock assembly and in-
spect the connector on the wire harness side.

Tester connection

Condition

Specified condition

2 – 5

Constant

Battery voltage

If the circuit is not as specified, inspect power source or wire
harness.

11.

INSPECT BACK DOOR COURTESY SWITCH CONTI-
NUITY

Switch position

Tester connection

Specified condition

Switch OFF

–

No continuity

Switch ON

2 – Body Ground

Continuity

If continuity is not as specified, replace the switch and motor.

12.

INSPECT BACK DOOR COURTESY SWITCH CIRCUIT

Disconnect the connector from the switch and opener motor,
and inspect the connector on the wire harness side.

Tester connection

Condition

Specified condition

1 – Ground

Luggage compartment door opener switch OFF

No voltage

1 – Ground

Luggage compartment door opener switch ON

Battery voltage

2 – Ground

Constant

Battery voltage

If the circuit is not as specified, inspect power source or wire
harness.

13.

INSPECT DOOR COURTESY LIGHT CONTINUITY

Using the ohmmeter, check that there is continuity between ter-
minals.
If continuity is not as specified, replace the light assembly or
bulb.