Lexus RX300 (MCU15). Service manual — part 128

Z10066

Wire Harness Side

1 2 3

4 5

BE4118

BE4119

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

BE–59

LEXUS RX300 (RM785E)

10.

INSPECT WIPER MOTOR CIRCUIT

Disconnect the connector from the motor and inspect the con-
nector on the wire harness side.

Tester connection

Condition

Specified condition

5 – Ground

Constant

Continuity

1 – Ground

* Wiper switch OFF or INT, HIGH

No voltage

1 – Ground

* Wiper switch LOW

Battery voltage

2 – Ground

Ignition switch LOCK or ACC

No voltage

2 – Ground

Ignition switch ON

Battery voltage

4 – Ground

* Wiper switch OFF or INT, LOW

No voltage

4 – Ground

* Wiper switch HIGH

Battery voltage

*: Turn ignition switch ON
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

11.

Front Washer:
INSPECT WASHER MOTOR OPERATION

Connect the positive (+) lead from the battery to terminal 2 and
the negative (–) lead to terminal 1, check that the motor oper-
ates.
NOTICE:
These tests must be performed quickly (within 20 seconds)
to prevent the coil from burning out.
If operation is not as specified, replace the motor.

12.

Rear Washer:
INSPECT WASHER MOTOR OPERATION

Connect the positive (+) lead from the battery to terminal 2 and
the negative (–) lead to terminal 3, check that the motor oper-
ates.
NOTICE:
These tests must be performed quickly (within 20 seconds)
to prevent the coil from burning out.
If operation is not as specified, replace the motor.

Z07418

Wire Harness Side

1

le–3–1–C

2 3

BE–60

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

LEXUS RX300 (RM785E)

13.

INSPECT WASHER MOTOR CIRCUIT

Disconnect the connector from the washer motor and inspect
the connector on harness side.

Tester connection

Condition

Specified condition

1 – Ground

Washer switch OFF (released)

No continuity

1 – Ground

Washer switch ON (pushed in)

Continuity

2 – Ground

Ignition switch LOCK or ACC

No voltage

2 – Ground

Ignition switch ON

Battery voltage

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

BE0BZ–04

I19169

Brake Fluid Level Warning Switch

Combination Meter

Parking Brake Switch

Airbag Sensor Assembly

Body ECU

Ignition Switch

Pattern Select Switch

Neutral Start Switch

Engine Hood Courtesy Switch

Low Oil Pressure Warning Switch

Passenger Seat Belt Warning

Seat Belt Warning Occupant
Detection Sensor

Door Lock Assembly
D Door Lock Motor
D Door UNLOCK Detection Switch

Sub–Fuel Sender Gauge

Back Door Lock Motor

Main Fuel Sender Gauge

Light Failure Sensor

Buckle Switch

Door Lock Assembly
D Door Lock Motor
D Door UNLOCK Detection Switch

RHD:

Engine & ECT ECU

Passenger Seat Belt Warning

P.K.B. Switch

LHD:

Skid Control ECU

Engine & ECT ECU

Ignition
Switch

Body
ECU

Pattern Select Switch

Airbag Sensor AssemblySkid Control ECU

–

BODY ELECTRICAL

COMBINATION METER

BE–61

LEXUS RX300 (RM785E)

COMBINATION METER

LOCATION

BE0UJ–02

I19170

Connector ”B”

Connector ”A”

Connector ”C”

Connector ”E”

Connector ”F”

BE–62

–

BODY ELECTRICAL

COMBINATION METER

LEXUS RX300 (RM785E)

CIRCUIT