Lexus SC300 / Lexus SC400. Service manual - part 200

BODY ELECTRICAL SYSTEM

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BODY ELECTRICAL SYSTEM

BE–1

GENERAL INFORMATION

Wiring Color Code

Wire colors are indicated by an alphabetical code.

B

=  Black

L

=  Blue

R

=  Red

BR

=  Brown

LG

=  Light Green

V

=  Violet

G

=  Green

O

=  Orange

W

=  White

GR

=  Gray

P

=  Pink

Y

=  Yellow

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

Connector

1. 

PIN NUMBERS OF FEMALE CONNECTOR

Numbered in order from upper left to lower right.

2. 

PIN NUMBERS OF MALE CONNECTOR

Numbered in order from upper right to lower left.

HINT: When connectors with different of the same number of
terminals are used with the same parts, each connector
name (letter of the alphabet) and pin number is specified.

3. 

DISTINCTION OF MALE AND FEMALE CONNECTORS
Male and female connectors are distinguished by shape of
their internal pins.
(a)  All connectors are shown from the open end, and the

lock is on top.

(b)  To pull apart the connectors, pull on the connector itself,

not the wires.

HINT: Check to see what kind of connector you are discon-
necting before pulling apart.

BE–2

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BODY ELECTRICAL SYSTEM

General Information

How to Replace Terminal

(with Terminal Retainer Type)

HINT: To remove the terminal for this type of connector,
please construct and use the special tool or like object shown
on the left.

1. DISCONNECT 

CONNECTOR

Disconnect the connector according to the instructions on

BE–2

.

2. 

DISCONNECT TERMINAL FROM CONNECTOR
(a)  Using the special tool, raise the retainer up to the

temporary lock position.

HINT: The needle insertion position varies according to the
connector ’s shape (number of terminals, etc.), so check the
position before inserting it.

(b)  Using the special tool, release the locking lug and pull

the terminal out from rear.

3. 

INSTALL TERMINAL TO CONNECTOR
(a)  Insert the terminal.
HINT:
1. 

Make sure the terminal is positioned correctly.

2. 

Insert the terminal until the locking lug locks firmly.

3.  Insert the terminal with retainer in the temporary lock

position.

(b)  Push the retainer in to the full lock position.

4. CONNECT 

CONNECTOR

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BODY ELECTRICAL SYSTEM

General Information

BE–3

Replacement of Fuse

HINT: If replacing the fuse, be sure to replace it with a fuse
with an equal amperage rating.

NOTICE:

1. 

Turn off all electrical components and the ignition switch

before replacing a fuse. Do not exceed the fuse amperage

rating.

2. 

Always use a fuse puller for removing and inserting a

fuse. Remove and insert straight in and out without

twisting. Twisting could force open the terminals too

much, resulting in a bad connection.

If a fuse continues to blow, a short circuit is indicated. The
system must be checked by a qualified technician.
HINT: The puller is located at Relay Block No. 2.

How to Inspect for System Inspection

This inspection precedure is a simple troubleshooting which
should be carried out on the vehicle during system operation
and is based on the assumption of system component
trouble (except for the wires and connectors, etc.).
Always inspect the trouble taking the following items into con-
sideration.

•

Ground point fault

•

Open or short circuit of the wire harness

•

Connector or terminal connection fault

•

Fuse or fusible link fault

NOTICE:

1. 

This is an on–vehicle inspection during system

operation. Therefore, inspect the trouble with due regard

for safety.

2. 

If connecting the battery directly, be careful not to short

circuit, and select the applicable voltage.

BE–4

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BODY ELECTRICAL SYSTEM

General Information