Toyota training ch07

Appendix B

How to Use an Electrical Wiring Manual
HOW TO USE THIS MANUAL
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 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.

COROLLA (EM0340U)

Body Electrical Diagnosis and Repair Course T502

B-1

Appendix B

HOW TO USE THIS MANUAL
* The system shown here is an EXAMPLE ONLY. It is different to the actual
circuit shown in the SYSTEM CIRCUITS SECTION.

[A]

Stop Light
(BAT)

[N]

(IG)
15A
STOP

7.5A
GAUGE

2

[B]

3 IB

4 IB

L

(S/D)

W–R

R–L

1

7 3C

2

[G]

[C]

S6
Stop Light SW

15 3C

14 IE1

8

2

R–L

11

(Shielded)

Stop

3

6

W–B

[J]

[K]

2

1

H17
High Mounted
Stop Light

W–B

W–B

R6
Rear Combination
Light LH

R7
Rear Combination
Light RH

Stop

4

G–B

[I]
G–R

G–R

W–B
W–B

1
BV1

L4
Light Failure Sensor

1

G–R

W–B

3

[F]

G–R

[H]
1
BV1

13
Y–G

L
G–W

(S/D)

G–W

7

4

BO

50

B-2

4

[E]

[L]

BL

[M]

COROLLA (EM0340U)

TOYOTA Collision Repair and Refinish

C7
Combination Meter

15 IE1

Rear
Lights

L

(S/D)

R

G–W

Skid Control ECU
with Actuator

[D]

(W/G)

1


Appendix B

Body Electrical Diagnosis and Repair Course T502

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Appendix B

B-4

TOYOTA Collision Repair and Refinish


Appendix B

Body Electrical Diagnosis and Repair Course T502

B-5

Appendix B

B-6

TOYOTA Collision Repair and Refinish


Appendix B

Body Electrical Diagnosis and Repair Course T502

B-7


Appendix B

B-8

TOYOTA Collision Repair and Refinish


Appendix B

Body Electrical Diagnosis and Repair Course T502

B-9