How to Read Wiring Diagrams

How to Read Wiring Diagrams

CONNECTOR SYMBOLS
Most of connector symbols in wiring diagrams are shown from the terminal side.




- Connector symbols shown from the terminal side are enclosed by a single line and followed by the direction mark.
- Connector symbols shown from the harness side are enclosed by a double line and followed by the direction mark.




- Male and female terminals
Connector guides for male terminals are shown in black and female terminals in white in wiring diagrams.




HARNESS INDICATION
- Letter designations next to test meter probe indicate harness (connector) wire color.
- Connector numbers in a single circle M33 indicate harness connectors.

COMPONENT INDICATION
- Connector numbers in a double circle F211 indicate component connectors.

GI-EXAMPL-02:

WIRING DIAGRAM - EXAMPLE







WIRING DIAGRAM LEGEND





SWITCH POSITIONS
Switches are shown in wiring diagrams as if the vehicle is in the normal condition.

A vehicle is in the normal condition when:
- ignition switch is OFF
- doors hood and trunk lid/back door are closed
- pedals are not depressed and
- parking brake is released.




DETECTABLE LINES AND NON-DETECTABLE LINES
In some wiring diagrams two kinds of lines representing wires with different weight are used.
- A line with regular weight (wider line) represents "a detectable line for DTC (Diagnostic Trouble Code)". "A detectable line for DTC" is a circuit in which ECM (Engine Control Module) can detect its malfunctions with the on board diagnostic system.
- A line with less weight (thinner line) represents "a non-detectable line for DTC". "A non-detectable line for DTC" is a circuit in which ECM cannot detect its malfunctions with the on board diagnostic system.




MULTIPLE SWITCH
The continuity of multiple switch is described in two ways as shown.
- The switch chart is used in schematic diagrams.
- The switch diagram is used in wiring diagrams.