howtouse.pdf

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 Point 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.

2004 COROLLA (EWD533U)

B HOW TO USE THIS MANUAL

[A]

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

circuit shown in the SYSTEM CIRCUITS SECTION.

Stop Light

From Power Source System (See Page 66)

15A

STOP

7.5A

GAUGE

[B]

[C]

[G]

S 6

Stop Light SW

IE1

[E]

C 7

[D]

Combination

Meter

ABS ECU

I 5

[F]

Light Failure Sensor

[H]

[ I ]

BV1

B18

[J]

(Shielded)

H17

[K]

High Mounted

Stop Light

BV1

B18

[L]

[M]

2004 COROLLA (EWD533U)

L 4

[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: Indicates Relay Block No.1

[H] : Indicates the wiring color.

Wire colors are indicated by an alphabetical code.

B = Black

W = White

BR = Brown

L = Blue

V = Violet

SB = Sky Blue

R = Red

G = Green LG = Light Green

[C] : ( ) is used to indicate different wiring and

connector, etc. when the vehicle model, engine

type, or specification is different.

[D] : Indicates related system.

[E] : Indicates the wiring harness and wiring harness

connector. The wiring harness with male terminal is

shown with arrows ( ).

Outside numerals are pin numbers.

P = Pink

Y = Yellow GR = Gray

O = Orange

The first letter indicates the basic wire color and the

second letter indicates the color of the stripe.

Example: L – Y

(Yellow)

[I] : Indicates a wiring Splice Point (Codes are ”E” for the

Engine Room, ”I” for the Instrument Panel, and ”B”

for the Body).

(Blue)

Female

Male ( )

The first letter of the code for each wiring harness

and wiring harness connector(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.

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.

[F] : Represents a part (all parts are shown in sky blue).

The code is the same as the code used in parts

position.

[G] : 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.

The Location of splice Point I 5 is indicated by the

shaded section.

[J] : Indicates a shielded cable.

[K] : Indicates the pin number of the connector.

The numbering system is different for female and

male connectors.

Example:

Example: Numbered in order

from upper left to

lower right

Numbered in order

from upper right to

lower left

3C indicates that

it is inside

Junction Block

No.3

Female

Male

[L] : 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.

[M] : Page No.

2004 COROLLA (EWD533U)

B HOW TO USE THIS MANUAL

[N]

System Outline

Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW.

When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL 8 of the light failure sensor, and also flows

through the rear lights warning light to TERMINAL 4 of the light failure sensor.

Stop Light Disconnection Warning

When the ignition SW is turned on and the brake pedal is pressed (Stop light SW on), if the stop light circuit is open, the current

flowing from TERMINAL 7 of the light failure sensor to TERMINALS 1, 2 changes, so the light failure sensor detects the

disconnection and the warning circuit of the light failure sensor is activated.

As a result, the current flows from TERMINAL 4 of the light failure sensor to TERMINAL 11 to GROUND and turns the rear lights

warning light on. By pressing the brake pedal, the current flowing to TERMINAL 8 of the light failure sensor keeps the warning

circuit on and holds the warning light on until the ignition SW is turned off.

[O]

Service Hints

S6 Stop Light SW

2–1 : Closed with the brake pedal depressed

L4 Light Failure Sensor

1, 2, 7–Ground : Approx. 12 volts with the stop light SW on

4, 8–Ground : Approx. 12 volts with the ignition SW at ON position

11–Ground : Always continuity

[P]

: Parts Location

Code

See Page

Code

See Page

Code

See Page

H17

[Q]

: Relay Blocks

Code

See Page

Relay Blocks (Relay Block Location)

R/B No.1 (Instrument Panel Brace LH)

[R]

: Junction Block and Wire Harness Connector

Code

See Page

Junction Block and Wire Harness (Connector Location)

Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)

Instrument Panel Wire and J/B No.3 (Instrument Panel Brace LH)

[S]

: Connector Joining Wire Harness and Wire Harness

Code

See Page

Joining Wire Harness and Wire Harness (Connector Location)

IE1

Floor Wire and Instrument Panel Wire (Left Kick Panel)

BV1

Luggage Room Wire and Floor Wire (Luggage Room Left)

[T]

: Ground Points

Code

See Page

Ground Points Location

Under the Left Center Pillar

Back Panel Center

[U]

: Splice Points

Code

See Page

Wire Harness with Splice Points

Code

See Page

Wire Harness with Splice Points

Cowl Wire

B18

Luggage Room Wire

2004 COROLLA (EWD533U)

[N] : Explains the system outline.

[O] : Indicates values or explains the function for reference during troubleshooting.

[P] : Indicates the reference page showing the position on the vehicle of the parts in the system circuit.

Example : Part ”L4” (Light Failure Sensor) is on page 36 of the manual.

Parts is 4th in order

Light Failure Sensor

[Q] : Indicates the reference page showing the position on the vehicle of Relay Block Connectors in the system circuit.

Example : Connector ”1” is described on page 18 of this manual and is installed on the left side of the instrument

panel.

[R] : Indicates the reference page showing the position on the vehicle of J/B and Wire Harness in the system circuit.

Example : Connector ”3C” connects the Instrument Panel Wire and J/B No.3. It is described on page 22 of this

manual, and is installed on the instrument panel left side.

[S] : Indicates the reference page describing the wiring harness and wiring harness connector (the female wiring

harness is shown first, followed by the male wiring harness).

Example : Connector ”IE1” connects the floor wire (female) and Instrument panel wire (male). It is described on

page 42 of this manual, and is installed on the left side kick panel.

[T] : Indicates the reference page showing the position of the ground points on the vehicle.

Example : Ground point ”BO” is described on page 50 of this manual and is installed on the back panel center.

[U] : Indicates the reference page showing the position of the splice points on the vehicle.

Example : Splice point ”I5” is on the Cowl Wire Harness and is described on page 44 of this manual.

2004 COROLLA (EWD533U)

The letter in the code is from the first letter of the part, and the number indicates its order in parts

starting with that letter.

Example : L 4 Á

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