Lexus RX300 (MCU15). Service manual - part 101

I06870

Magnetic Clutch 
Relay

AC1NM–01

Z18060

1

2

3

5

3

5

2

1

AC–72

–

AIR CONDITIONING

MAGNETIC CLUTCH RELAY

LEXUS RX300   (RM785E)

MAGNETIC CLUTCH RELAY

INSPECTION

1.

REMOVE MAGNETIC CLUTCH RELAY
(Marking : MG CLT) FROM ENGINE ROOM JUNCTION
BLOCK

2.

INSPECT MAGNETIC CLUTCH RELAY
(Marking : MG CLT) CONTINUITY

Condition

Tester connection

Specified condition

Constant

1 – 2

Continuity

Apply B+ between

terminals 1 and 2

3 – 5

Continuity

If continuity is not as specified, replace the relay.

3.

INSTALL MAGNETIC CLUTCH RELAY TO ENGINE
ROOM JUNCTION BLOCK

I06870

Fan No. 1 
Relay

Fan No. 2 
Relay

Fan No. 2 Relay

AC3AY–01

I05741

1

2

3

4

1

2

3

4

I18286

5

3

1

2

3

4

5

1

2

4

–

AIR CONDITIONING

COOLING FAN RELAY

AC–73

LEXUS RX300   (RM785E)

COOLING FAN RELAY

INSPECTION

1.

REMOVE RELAY

2.

INSPECT FAN NO. 1, 3 RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

3 – 4

Continuity

Apply B + between termi-

nals 3 and 4.

1 – 2

No Continuity

If continuity is not as specified, replace the relay.

3.

INSPECT FAN NO. 2 RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

3 – 5

2 – 4

Continuity

Apply B + between termi-

nals 5 and 3.

1 – 2

Continuity

If continuity is not as specified, replace the relay.

AC1NN–02

I07792

1

2

AC–74

–

AIR CONDITIONING

CONDENSER FAN

LEXUS RX300   (RM785E)

CONDENSER FAN

ON–VEHICLE INSPECTION

1.

INSPECT CONDENSER FAN OPERATION

Inspect the fan operation in these conditions, as shown in the
chart below.
Test conditions:

S

Start engine

S

Blower speed control switch position ”HI”

S

Temperature control dial at ”COOL” position

S

Set manifold gauge set

S

A/C switch ON

Condition

Fan operation (Fan speed)

Engine coolant temperature

90 

°C (194 °F) or below

Rotate (Low speed)

Engine coolant temperature

95 

°C (203 °F) or above

Rotate (High speed)

Refrigerant pressure is less than

1,520 kPa (15.5 kgf/cm

2

, 220 psi)

Rotate (Low speed)

Refrigerant pressure is 1,520 kPa

(15.5 kgf/cm

2

, 220 psi) or above

Rotate (High speed)

If operation is not as specified, proceed to the next inspection.

2.

INSPECT CONDENSER FAN MOTOR OPERATION

(a)

Disconnect the fan connector.

(b)

Connect battery and ammeter to the fan connector, as
shown in the illustration.

(c)

Check that the fan rotates smoothly and check the read-
ing on the ammeter.
Specified amperage: 9.8 ± 1.5 A at 20 °C (68 °F)

If operation is not as specified, replace the fan motor (See page
CO–26).
If operation is as specified, check the pressure switch, cooling
fan relays and water temp. switch (See page CO–33, 
CO–34).

I07790

AC1NR–01

I07791

I08486

–

AIR CONDITIONING

AIR REFINER FILTER

AC–75

LEXUS RX300   (RM785E)

AIR REFINER FILTER

REPLACEMENT

1.

REMOVE LOWER COVER FROM LOWER NO.2 FIN-
ISH PANEL

2.

REMOVE AIR REFINER FILTER

(a)

Remove the filter cover.

(b)

Pull out the filter.

(c)

Remove the filter from the flame.

3.

INSTALL NEW FILTER

(a)

Install the new filter to the flame.

(b)

Install the filter to blower unit.

(c)

Install the filter cover.

4.

INSTALL LOWER COVER TO LOWER NO.2 FINISH
PANEL