How to Read Wiring Diagrams

Example Diagrams








Description Charts

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 those related to OBD, may use a new style slide-locking type harness connector.





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





Harness Indication
- Letter designations next to test meter probes indicate harness (connector) wire colors.
- Connector numbers in a signal circle (M33) indicate harness connectors.

Component Indication
- Connector numbers in a double circle (F211) indicate component connectors.

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 brakes 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 malfunctions with the on-board diagnostic system.

MULTIPLE SWITCH





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

SPLICE LOCATION



- "GT2", "T4" etc., which are shown in the wiring diagram, refer to the wiring harness splice points. These points are located in the shaded areas "GT2", "T4" , etc. in illustrations under the title "SPLICE LOCATIONS".
- Wiring harness splice points are subject to change without notice.