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.
- Certain systems and components, especially related to OBD, may use a new style slide-locking type harness connector. For description and how to disconnect, refer to 'Harness Connector'.




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





SAMPLE/WIRING DIAGRAM - EXAMPL -
- For detail, refer to following "DESCRIPTION".







DESCRIPTION





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.
- 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 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.