Reading Wiring Diagrams - Symbols
Z-GI-8spec tableSymbols
Symbols (left column)
Battery
MeaningGenerates electricity through chemical reaction. Supplies direct current to circuits.
Ground (1)
MeaningConnecting point to vehicle body or other ground wire where current flows from positive to negative terminal of battery. Ground (1) indicates a ground point to body through wire harness. Ground (2) indicates point where component is grounded directly to body. Remark: Current will not flow through a circuit if ground is faulty.
Ground (2)
MeaningSee Ground (1).
Fuse (1) (box)
MeaningMelts when current flow exceeds that specified for circuit, stopping current flow. Precautions: Do not replace with fuses exceeding specified capacity. Types: Box type, Cartridge type.
Fuse (2) (Cartridge)
MeaningSee Fuse (1).
Main fuse/Fusible link
MeaningMain fuse; Fusible link.
Transistor (1) NPN
MeaningElectrical switching component. Turns on when voltage is applied to the base (B). Collector indication mark on B, E, C body.
Transistor (2) PNP
MeaningReading code 2 S C 828 A: Semiconductor / Number of terminals / Revision mark / A: High-frequency PNP / B: Low-frequency PNP / C: High-frequency NPN / D: Low-frequency NPN.
Lamp (3.4 W)
MeaningEmits light and generates heat when current flows through filament.
Symbols (right column)
Resistance
MeaningA resistor with a constant value. Mainly used to protect electrical components in circuits by maintaining rated voltage. Reading resistance values for Colored type: No.1 Color band = First color (Resistance values), No.2 Color band = Second color (Resistance values), No.3 Color band = Multiplier, No.4 Color band = Tolerance. Narrow/Wide stripe widths.
Motor
MeaningConverts electrical energy into mechanical energy.
Pump
MeaningPulls in and expels gases and liquids.
Cigarette lighter
MeaningElectrical coil that generates heat.
Resistance color code (Colored type)
Black
No.1 Resistance values0
No.2 Resistance values0
No.3 Multiplier×10^0
No.4 Tolerance
Brown
No.1 Resistance values1
No.2 Resistance values1
No.3 Multiplier×10^1
No.4 Tolerance
Red
No.1 Resistance values2
No.2 Resistance values2
No.3 Multiplier×10^2
No.4 Tolerance
Orange
No.1 Resistance values3
No.2 Resistance values3
No.3 Multiplier×10^3
No.4 Tolerance
Yellow
No.1 Resistance values4
No.2 Resistance values4
No.3 Multiplier×10^4
No.4 Tolerance
Green
No.1 Resistance values5
No.2 Resistance values5
No.3 Multiplier×10^5
No.4 Tolerance
Blue
No.1 Resistance values6
No.2 Resistance values6
No.3 Multiplier×10^6
No.4 Tolerance
Purple
No.1 Resistance values7
No.2 Resistance values7
No.3 Multiplier×10^7
No.4 Tolerance
Grey
No.1 Resistance values8
No.2 Resistance values8
No.3 Multiplier×10^8
No.4 Tolerance
White
No.1 Resistance values9
No.2 Resistance values9
No.3 Multiplier×10^9
No.4 Tolerance
Gold
No.1 Resistance values
No.2 Resistance values
No.3 Multiplier×10^-1
No.4 Tolerance±5%
Silver
No.1 Resistance values
No.2 Resistance values
No.3 Multiplier×10^-2
No.4 Tolerance±10%
(none)
No.1 Resistance values
No.2 Resistance values
No.3 Multiplier
No.4 Tolerance±20%
NOTE
Numerical type: 3 3 2 — Third digit: ×10^n; Second; First — Resistance values.