Lexus ES300 (1997 year). Manual — part 605

3

HOW TO USE THIS MANUAL B

This manual provides information on the electrical circuits installed on vehicles
by dividing them into a circuit for each system.

The actual wiring of each system circuit is shown from the point where the power
source is received from the battery as far as each ground point. (All circuit
diagrams are shown with the switches in the OFF position.)

When troubleshooting any problem, first understand the operation of the circuit
where the problem was detected (see System Circuit section), the power source
supplying power to that circuit (see Power Source section), and the ground
points (see Ground Points section). See the System Outline to understand the
circuit operation.

When the circuit operation is understood, begin troubleshooting of the problem
circuit to isolate the cause. Use Relay Location and Electrical Wiring Routing
sections to find each part, junction block and wiring harness connectors, wiring
harness and wiring harness connectors, splice points, and ground points of each
system circuit. Internal wiring for each junction block is also provided for better
understanding of connection within a junction block.
Wiring related to each system is indicated in each system circuit by arrows
(from ,to ). When overall connections are required, see the Overall Electrical
Wiring Diagram at the end of this manual.

* The system shown here is an EXAMPLE ONLY. It is different to the actual

circuit shown in the SYSTEM CIRCUITS SECTION.

4

B HOW TO USE THIS MANUAL

5

B

I : Junction Block (The number in the circle is the

J/B No. and the connector code is shown beside
it). Junction Blocks are shaded to clearly
separate them from other parts (different junction
blocks are shaded differently for further
clarification).

A : System Title

B : Indicates a Relay Block. No shading is used and only the

Relay Block No. is shown to distinguish it from the J/B.

Example: 1 Indicates Relay Block No. 1.

C : Indicates the connector to be connected to a

part (the numeral indicates the pin No.)
Explanation of pin use.

J : Indicates the wiring color.

Wire colors are indicated by an alphabetical code.

B = Black
BR = Brown
G = Green
GR = Gray

L = Black
LG = Light Green
O = Orange
P = Pink

R = Red
V = Violet
W = White
Y = Yellow

The first letter indicates the basic wire color and the second
letter indicates the color of the stripe.

D : Connector Color Connectors not indicated are milky

white in color:

E : ( ) is used to indicate different wiring and connector, etc.

when the vehicle model, engine type, or specification is
different.

F : Indicates related system.

G : Indicates the wiring harness and wiring harness

connector. The wiring harness with male terminal is
shown with arrows ( ).

Example:

L – Y

K : Indicates a wiring Splice Point (Codes are “E” for

the Engine Room, “I” for the Instrument Panel,
and “B” for the Body).

Example:

The Location of Splice Point I 5 is indicated by the shaded
section.

L : Page No.

M : Indicates a shielded cable.

Example:

N : Indicates a ground point.

The first letter of the code for each ground point(s) indicates
the component’s location, e.g. “E” for the Engine
Compartment, “I” for the Instrument Panel and Surrounding
area, and “B” for the Body and Surrounding area.

The first letter of the code for each wiring harness and wiring
harness connector(s) indicates thecomponent’s location, e.g,
“E” for the Engine Compartment, “I” for the Instrument Panel
and Surrounding area, and “B” for the Body and Surrounding
area.

When more than one code has the first and second letters in
common, followed by numbers (e.g, IH1, IH2), this indicates
the same type of wiring harness and wiring harness connector.

P : When 2 parts both use one connector in common, the parts

connector name used in the wire routing section is shown in
square brackets [ ].

O : Indicates the pin number of the connector.

The numbering system is different for female and male
connectors.

H : Represents a part (all parts are shown in sky

blue). The code is the same as the code used in
parts position.

3B indicates
that it is inside
Junction Block
No. 3.

v

v

The pins shown are only for the highest grade, or only
include those in the specification.

lower right

lower left

(blue) (yellow)

6

B HOW TO USE THIS MANUAL

WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS TO TERMINAL 3 OF THE POWER WINDOW MASTER SW, TERMINAL 2 OF THE POWER WINDOW CONTROL
RELAY AND TERMINAL 8 OF THE POWER WINDOW SW THROUGH THE DOOR FUSE.

1.

DRIVER’S WINDOW “MANUAL UP” OPERATION BY MASTER SW

HOLDING MANUAL SW (DRIVER’S) ON “UP” POSITION LOCATED IN POWER WINDOW MASTER SW, THE CURRENT FLOWS TO TERMINAL 5 OF THE POWER WINDOW CON-
TROL RELAY THROUGH TERMINAL 3 OF THE MASTER SW

TERMINAL 2 TO OPERATE A POWER WINDOW CONTROL RELAY. THUS THE CURRENT INSIDE THE RELAY

FLOWS FROM TERMINAL 2 OF THE RELAY

TERMINAL 1

TERMINAL 2 OF THE POWER WINDOW MOTOR

TERMINAL 1

TERMINAL 4 OF THE RELAY

TERMI-

NAL 3

TO GROUND. THE MOTOR TURNS TO ASCENT THE WINDOW. RELEASING THIS SW, THE ROTATION OF MOTOR IS STOPPED AND THE WINDOWS CAN STOP AT

WILL POINT.

(FOR THE “MANUAL DOWN” OPERATION, CURRENT FLOWS IN THE REVERSE DIRECTION BECAUSE THE TERMINALS WHERE IT FLOW ARE CHANGED).

2.

DRIVER’S WINDOW “AUTO DOWN” OPERATION BY MASTER SW

ONCE THE “AUTO DOWN” BUTTON OF THE MASTER SW IS PUSHED, THE CURRENT FLOW TERMINAL 9 OF THE POWER WINDOW CONTROL RELAY THROUGH TERMINAL 3
OF THE MASTER SW

TERMINALS 8 AND 9 TO OPERATE THE RELAY. THUS THE CURRENT INSIDE THE POWER WINDOW CONTROL RELAY FLOWS FROM TERMINAL 2 OF

THE RELAY

TERMINAL 4

TERMINAL 1 OF THE POWER WINDOW MOTOR

TERMINAL 2

TERMINAL 1 OF THE RELAY

TERMINAL 3

TO GROUND. THE

MOTOR CONTINUES THE ROTATION ENABLING TO DESCENT THE WINDOW.

THE WINDOW DESCENDS TO THE END POSITION. THE CURRENT WILL BE CUT OFF TO RELEASE THE AUTO DOWN FUNCTION BASED ON THE INCREASING CURRENT
BETWEEN TERMINAL 2 OF THE RELAY AND TERMINAL 1 IN RELAY.

3.

DRIVER’S WINDOW AUTO DOWN RELEASE OPERATION BY MASTER SW

HOLDING THE MANUAL SW (DRIVER’S) ON “UP” POSITION IN OPERATING AUTO DOWN. THE CURRENT FROM TERMINAL 3 OF THE MASTER SW PASSING TERMINAL 2
FLOWS TERMINAL 5 OF THE RELAY AND RELEASES THE AUTO DOWN FUNCTION IN THE POWER WINDOW CONTROL RELAY. RELEASING THE HAND FROM SW, WINDOW
STOPS AND CONTINUING ON TOUCHING SW. THE FUNCTION SWITCHES TO MANUAL UP OPERATION.

4.

PASSENGER’S WINDOW UP OPERATION (MASTER SW) AND WINDOW LOCK SW OPERATION

HOLDING PASSENGER’S WINDOW SW (MASTER SW) ON “UP”, THE CURRENT FLOWS FROM TERMINAL 3 OF THE MASTER SW PASSING TERMINAL 6 TO TERMINAL 3 OF THE
POWER WINDOW SW (PASSENGER’S)

TERMINAL 4 TERMINAL

2 OF THE MOTOR

TERMINAL 1

TERMINAL 9 OF THE POWER WINDOW SW

TERMINAL 7

TERMINAL 1 OF THE MASTER SW

TERMINAL 4 TO GROUND. THE MOTOR RUNS TO ASCENT THE WINDOW. RELEASING THIS SW, THE ROTATION OF MOTOR IS

STOPPED AND WINDOW CAN STOP AT WILL PLACE. SWITCHING THE WINDOW LOCK SW IN “LOCK” POSITION, THE CIRCUIT IS OPENED AND STOPPED THE MOTOR ROTA-
TION.
(FOR THE DOWN OPERATION, CURRENT FLOWS IN THE REVERSE DIRECTION BECAUSE THE TERMINALS WHERE IT FLOWS ARE CHANGED).

P 2 POWER WINDOW CONTROL RELAY

3–GROUND: ALWAYS CONTINUITY

2–GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION

5–GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION AND THE MASTER SW AT UP POSITION

8–GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION AND THE MASTER SW AT AUTO DOWN POSITION

9–GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION AND THE MASTER SW AT DOWN OR AUTO DOWN POSITION

P 4 POWER WINDOW MASTER SW

4–GROUND: ALWAYS CONTINUITY

3–GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION

WINDOW LOCK SW

OPEN WITH THE WINDOW LOCK SW AT LOCK POSITION

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

P2

21

P4

21

P6

21

P3

21

P5

21

: RELAY BLOCKS

CODE

SEE PAGE

RELAY BLOCK (RELAY BLOCK LOCATION)

1

16

R/B NO. 1 (INSTRUMENT PANEL LEFT)

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

38

14

J/B NO. 3 AND COWL WIRE (INSTRUMENT PANEL LEFT SIDE)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

ID1

26

FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)

IH1

26

FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINT LOCATION

IC

24

COWL LEFT

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

I 5

24

COWL WIRE

Q

R

S

T

U

V

W

X

SERVICE HINTS

SYSTEM OUTLINE