Lexus SC300 / Lexus SC400. Manual — part 962

232

AUTOMATIC AIR CONDITIONER

IR2

7

IQ1

8

IQ1

19

IQ1

10

IQ1

4

1E

18

3H

13

1J

1

3E

3

3H

12

ED

IF

EA

4

1

L–B

L–B

W–

B

P–

L

P–

B

W–

G

W–

B

P–

L

P–

B

W–

G

L–

B

P–

L

P–

B

P–

B

BR

W–

B

W–

B

W–

B

W–

B

L–G

A

2

B

5

C

7

B

17

B

6

E1

E1

A/C

TC

TC

OP1

DIN

DOUT

E

PSW

REOST

A/C CONTROL ASSEMBLY

TDCL
(TOTAL DIAGNOSTIC

COMMUNICATION LINK)

CHECK
CONNECTOR

A

/C

PR

E

SSU

R

E

SW

A1 2

, A13

, A 14

T 6

C 3

A3

11

4

11

3

C

A

B

IK1

10

P–

B

3A

12

3H

10

3G

3

3A

1

A

5

A

6

IQ1

18

IQ1

2

3A

9

3G

2

IG1

5

1I

3

W–B

G–

O

G–

O

G–

O

G

G

LL

W–

G

8

6

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

7. 5A
PANEL

I1

6

IN

T

E

G

R

A

T

IO

N

RE

L

A

Y

(CA

NA

D

A

)

(US

A

)

RHEOSTAT

R 9

TC

TAIL

IN1

5

A

5

A

233

A 2

A/C MAGNETIC CLUTCH

4–GROUND : APPROX. 3.7

A 3

A/C PRESSURE SW

4–1 : OPEN ABOVE APPROX. 15.5KG/CM

2

(30 PSI, 206 KPA) OR 27 KG/CM

2

(384 PSI, 2648 KPA)

A17, A18

POWER TRANSISTOR

(B)1– (A)2

: APPROX. 2.0–2.4K

A12, A13, A14

A/C CONTROL ASSEMBLY

+B – GROUND: ALWAYS APPROX. 10–14 VOLTS

IG + – GROUND: APPROX. 10–14 VOLTS WITH IGNITION SW AT ON POSITION

HR – GROUND: APPROX. 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND DO NOT TURN THE BLOWER MOTOR

BELOW 1 VOLTS WITH IGNITION SW AT ON POSITION AND TURN THE BLOWER MOTOR

LP – GROUND: NO CONTINUITY WITH PRESSURE LESS THAN 2.1 KG/CM

2

(30 PSI, 206 KPA) OR ABOVE 27 KG/CM

2

(384 PSI, 2648 KPA)

ACC – GROUND: APPROX. 10–14 VOLTS WITH IGNITION SW AT ACC OR ON POSITION

WV – GROUND: 10–14 VOLTS AT START THE ENGINE AND MAX. COLD POSITION OF A/C TEMP. CONTROL SW

BELOW 1 VOLTS AT START THE ENGINE AND MAX. WARM POSITION OF A/C TEMP. CONTROL SW

MGC – GROUND: BELOW 1 VOLTS AT START THE ENGINE, PUSH THE A/C AUTO SW AND A/C SW ON POSITION

10–14 VOLTS AT START THE ENGINE, PUSH THE A/C AUTO SW AND A/C SW OFF POSITION

BLR – GROUND: BELOW 1.5 VOLTS WITH THE IGNITION SW ON AND TURN THE BLOWER MOTOR

S5 – GROUND: 4–6 VOLTS WITH THE IGNITION SW ON

SG – GROUND: ALWAYS CONTINUITY

MH – MC : 13–19 VOLTS WITH IGNITION SW OFF

MFRS – GROUND: APPROX. 12 VOLTS WITH FRESH SW ON

MREC – GROUND: APPROX. 12 VOLTS WITH RECIRC SW ON

MFACE – GROUND: APPROX. 12 VOLTS WITH FACE SW ON

MDEF – GROUND: APPROX. 12 VOLTS WITH DEF SW ON

E – GROUND: ALWAYS CONTINUITY

B 3

BLOWER RESISTOR (FOR LOW SPEED)

1–2 : APPROX. 2.6–3.0

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

A 1

26

A18

B

28

E 9

A

28

A 2

26

A19

28

I 2

27

A 3

26

A20

28

I16

29

A12

C

28

A27

28

N 4

29

A13

A

28

A28

28

R 9

29

A14

B

28

A33

28

T 6

29

A15

28

B 2

28

V 4

27

A16

28

B 3

28

W 4

29

A17

A

28

C 3

26

: RELAY BLOCKS

CODE

SEE PAGE

RELAY BLOCKS (RELAY BLOCK LOCATION)

2

19

ENGINE COMPARTMENT LEFT

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1A

20

ENGINE ROOM MAIN WIRE

1B

20

ENGINE ROOM MAIN WIRE

1E

20

INSTRUMENT PANEL WIRE

1I

1J

20

COWL WIRE

1K

20

COWL WIRE

3A

3B

3E

23

INSTRUMENT PANEL WIRE

3G

3H

SERVICE HINTS

234

AUTOMATIC AIR CONDITIONER

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

EB1

34

ENGINE WIRE AND ENGINE ROOM MAIN WIRE (FRONT SIDE OF R/B NO. 2)

IE1

36

ENGINE ROOM MAIN WIRE AND COWL WIRE (R/B NO. 4)

IE2

36

ENGINE ROOM MAIN WIRE AND COWL WIRE (BEHIND GLOVE BOX)

IG1

36

INSTRUMENT PANEL WIRE AND COWL WIRE (R/B NO. 5)

II1

36

ENGINE WIRE AND A/C WIRE (BEHIND GLOVE BOX)

IJ2

36

ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)

IK1

36

ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)

IN1

38

ENGINE ROOM MAIN WIRE AND A/C WIRE (BEHIND GLOVE BOX)

IQ1

38

INSTRUMENT PANEL WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL CENTER)

IR1

38

CONSOLE BOX WIRE AND A/C SUB WIRE (BEHIND GLOVE BOX)

IR2

38

CONSOLE BOX WIRE AND A/C SUB WIRE (BEHIND GLOVE BOX)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

EA

34

FRONT SIDE OF RIGHT FENDER

EB

34

FRONT SIDE OF LEFT FENDER

ED

34

REAR SIDE OF INTAKE MANIFOLD

IF

36

LEFT KICK PANEL

IJ

36

RIGHT KICK PANEL

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

E11

34

ENGINE ROOM MAIN WIRE

I28

38

CONSOLE BOX WIRE

E18

34

ENGINE WIRE

I29

38

CONSOLE BOX WIRE

I27

38

A/C WIRE

I32

38

ENGINE WIRE

235