How to Use Wiring Diagrams

Wiring Diagram Layout:

Wiring Diagram Details:

1 Arrow
Indicates wiring circuit is continued on the previous and/or next diagram section.

2 Fuse Designation
Example: S15 = Fuse number 15, 10 amps, in fuse/relay panel.

3 Test Points On Fuse/Relay Panel

4 Test Points Used During Troubleshooting
Numbers in black circles may be found in a regular wiring diagram or in a wiring diagram included with troubleshooting.

5 Wire Cross-section Size And Wire Color Code
Wire size is in mmsq, for wire size conversion to American Wire Gauge (AWG), see Wire Size Conversion Chart.
Wire color codes are explained in Wire Color Code Identification.

6 Component Designation (code)
Use diagram article to identify the component code.
For example: G39 = Heated Oxygen Sensor

7 Internal Connections (thin lines)
These connections are not always wires. Internal connections are current carrying and are listed to allow tracing of current flow inside components and wiring harnesses.

8 Wire Harness Ground Connection
Locations of ground connections are indicated in the diagram article.

9 Relay/Control Module Connectors On Fuse/Relay Panel
Shows the individual terminals in a multi-point connector.
Example: 4/30
4 = Contact 4 of the relay/control module socket on the relay panel or relay carrier
30 = Terminal 30 (B+) on relay/control module

10 Relay Location Number
Indicates relay location on fuse/relay panel.

11 Fuse/Relay Panel Connectors
Shows wiring of multi-point or single connectors on fuse/relay panel.
Example: G1/10 = Multi-point connector G1, terminal 10

12 Terminal Designation
Designation which appears on actual component and/or terminal number of a multi-point connector.

13 Wire Continuation (Current Track Number)
Number in frame indicates current track where wire is continued.

14 Continuation of Internal Connections
Letters indicate where connection continues on the previous and/or next diagram section.

15 Component Symbols
Example component symbols are illustrated in Symbols Identification

16 Wiring Harness Splice Connection
Locations of splice connections are indicated in the diagram article.

17 Arrow
Indicates component is continued on the previous and/or next diagram section.

18 Component Designation (code) Without Component Symbol
Indicates circuit continues to a component that is on a different system diagram. The component is identified by its component designation (code).
Example: J60 = Automatic Transmission Relay
If this circuit was needed it would be necessary to go to the Automatic Transmission Wiring Diagram and locate the Automatic Transmission Relay (J60).