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How to Read and Use the Circuit Schematics

OVERVIEW

Circuit Schematics:




Each schematic represents one circuit. A circuit's wires and components are arranged to show current flow, from power at the top of the image, to ground, at the bottom.
Other circuits may share power or ground terminals or wiring with the circuit shown. A wire that connects one circuit to another, for example, is cut short and has an arrowhead at the end of it pointing in the direction of current flow. Next to the arrowhead is the name of the circuit or component which shares that wiring. To quickly check shared wiring, check the operation of a component it serves. If that component works, you know the shared wiring is OK.

All connectors are numbered (C709, C416, etc.). Below each connector number (except those for components) is the number of a photo showing the connector's location on the car. Connector cavities are also numbered. The numbering sequence begins at the top left corner of the connector as seen. Disregard any numbers molded into the connector housing.

Wires are identified by the abbreviated names of their colors; the second color is the color of the stripe. Wires are also identified by their location in a connector. The number "2" next to the male and female wire terminals at C416, for example, means those terminals join in cavity 2 of connector C416.
Refer to "Wire Color Abbreviations".

POWER DISTRIBUTION SCHEMATICS
Power Distribution schematics show how power is supplied from the positive battery terminal to various circuits in the car. Refer to the power distribution diagrams to get a more detailed picture of how power is supplied to the circuit you're working on.

From Battery to Ignition Switch, Fuses, and Relays

Power Distribution Schematics-From Battery To Ignition Switch, Fuses,and Relays:




Individual circuit schematics begin with a fuse. The first half of power distribution, however, shows the wiring "upstream" between the battery and the fuses.

From Fuses to Relays and Components



The second half of power distribution shows the wiring "From Fuses to Relays and Components." This can speed your troubleshooting by showing which circuits share fuses. If power distribution shows that an inoperative circuit and another circuit share a fuse, check a component in the other circuit. If it works, you know the fuse is good and power is available to the inoperative circuit.

GROUND DISTRIBUTION SCHEMATICS

Ground Distribution Schematics:




This sample Ground Distribution schematic shows all of the components that share two ground points.

COMPONENT LOCATIONS



To see where a component or connector is located on the car, look up its photo number under "Photographs" or in the "A-Z Component List".
If there is no photo number below or beside a connector, look up that connector by number under "Connector Views".

CONNECTOR VIEWS

Cavity Numbering System:




To see the configuration of a connector's cavities, look up its view number under "Connector Views". Each view includes the color of the connector, where it is located, and what it connects to.
Use the Connector Views to help locate the proper cavity when you need to probe a connector. It can be especially helpful if the connector has more than one wire of the same color.
Connector views can also be used to help diagnose multiple symptoms in separate circuits which could be caused by a single problem in a connector shared by those circuits. Here's how:
1. Pick one of the multiple symptoms and look up the schematic for that circuit.
2. Make a list of all the in-line and fuse box connectors in that schematic (include page numbers).
3. Then, under "Connector Views", look up each connector on your list to see if circuits related to the other symptoms run through one of them. If they do, inspect that connector for the problem.

Connector Views:




Example: The blower, rear window defogger, and the windshield wiper don't work. List all in-line and fuse box connectors in the blower controls circuit and then check the Connector View section (sample below). You find that C324 is common to the rear window defogger circuit and wiper/washer circuit, so you inspect C324 and find the problem, bent terminals.







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