How To Use Electrical Schematics

Schematics:

How to read wiring schematics:

Typical Information that can be found in a schematic as shown below.

Component
Connector Reference
Pin Cavity Number
Wire Type
Wire Colour
Wire Size
Wire Number
Wire Splice
Twisted Wire Pair
In line Connector

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Electrical connector reference:

Each electrical connector has the letter C and a number assigned to it.

E.g. The rear door harness window switch connector is C392.

Inline connector reference:

The inline connectors have a number as well as an identification letter and either an M or an F to identify if the connector is male or female. The connector number and letter combination tells us which specific connector is referenced.

E.g. The rear door harness inline connectors are C001NF and C001 Nm.

For all inline connector reference letters refer to the harness topology page of the service schematics. Refer to SERVICE SCHEMATICS (COMPLETE VEHICLE) .

Ground point and splice identification:

The letter E is used to designate a ground/earth on all harnesses.

SP is used to designate a spliced wire.

Wire colour abbreviations:

The following is commonly used for depicting wire colours:

Colour modifier of the wire, such as light or dark (if applicable).
Primary colour of the wire.
Secondary colour of the wire (tracer/stripe).

Example: Bl/B = Blue wire with Black Tracer/Stripe

Wire insulation and connector body colours in schematic information are abbreviated with a two character code as listed below.

Code	R	W	Gr	Bl	Y	P	G	Br	V	Lg	◦	B
Colour	Red	White	Gray	Blue	Yellow	Pink	Green	Brown	Violet	Light green	Orange	Black

Finding a connector end view from the wiring schematic:

To find the connector end view for an electrical connector on the schematic follow the following procedure:

Note the connector identification number and the harness that it is part of.
Look for the corresponding connector end view document on the service portal.
To determine the physical location and the cavity number of the pins in the connector refer to the end view document.
If more detail is required refer to the harness drawing that is attached to the end view document.

Example: Finding C392 from the service schematic

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Understanding connector end views (numbers only):

Connectors will not always have all the cavity numbers marked on them. It may be necessary to count forwards or backwards from the nearest marked pint.

Example: Pin 4

Using the marking on the connector pin 6, 9, 12 and 15 run from left to right on the bottom row of this connector. That means that the pins on this particular connector are numbered from the top down, so pin 1 will be the top left pin while pin 18 will be bottom right. To find pin 4 count forwards from pin 1 or backwards from pin 6.

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Understanding connector end views (letters and numbers):

Some connectors will have both numbers and letters, these can be used to identify the pin. These types of connectors will have numbers running along one side of the connecter and letters running along the other. To identify the pint both the letter and corresponding number need to be referenced.

Example: Pins A1 & M4

Pin A1 - Look for the letter A and then the corresponding number 1.

Pin M4 - Look for the letter M and then the corresponding number 4.

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