How to read an electrical diagram

1) Contents of the electrical diagram (chain)

POSITION	EXPLANATION
A	- Upper horizontal lines: power supply, power supply Power lines: 30, 15, 15A, 15C
IN	- EF7 or AF3 or F2 EF7: fuse no. 20 in the fuse box in the engine compartment AF3: fuse no. 3 in the fuse box in the engine compartment, add. F2: Fuse No. 2 in the fuse box on the dashboard
C	- Connector (X101~X902) Connector no. X401, pin no. 6 See Main connector position (section 2)
D	- Wiring harness connection J201: Wiring harness connection JX202: wiring harness connector
E	Component internal circuit (relay) (component name, pin number)
F	- Internal component circuit (controller) (component name, pin number and wiring diagram)
G	Wire harness color See Wire Harness Color Abbreviations
H	- Ground harness block Ground harness block position (GX101~GX402)
I	- Bottom horizontal line: Ground line Ground position (G103~G302) B: Weight

2. Chain symbols

CONDITIONAL SYMBOL	MEANING
X	connector
E	Fuse in the fuse box in the engine compartment,
A	Fuse in the fuse box in the engine compartment, add.
F	Fuse in the fuse box on the dashboard
G	Weight
J	contact block

3. Purpose of power lines (number)

Power supply number	Power Supply Status
15	Battery powered (B+) when ignited in position "ON" And "ST" (IGN II/III)
15A	Battery powered (B+) when ignited in position "ON" (IGN II)
30	Battery powered (B+) directly, regardless of ignition position
31	Ground connected to battery (-)

4. Color coding of wire harnesses

Reduction	Color	Reduction	Color
BN	Brown	L-BU	light blue
GN	Green	RD	Red
VT	Violet	BU	Blue
PK	Pink	YE	Yellow
WH	White	GY	Grey
Or	Orange	BK	Black
L-GN	light green

5. How to check the connector pin number

The pin number is indicated according to the connector number. Example: pin number 4 of connector X405