How to Use Wiring Diagrams

A: RELAY

A symbol used to indicate a relay.

B: CONNECTOR-1

The sketch of the connector indicates the one-pole types.

C: WIRING CONNECTION

Some wiring diagrams are indicated in foldouts for convenience. Wiring destinations are indicated where necessary by corresponding symbols (as when two pages are needed for clear indication).

D: FUSE NO. & RATING

The "FUSE No. & RATING" corresponds with that used in the fuse box (main fuse box, fuse and joint box).

E: CONNECTOR-2

• Each connector is indicated by a symbol.
• Each terminal number is indicated in the corresponding wiring diagram in an abbreviated form.
• For example, terminal number "C2" refers to No. 2 terminal of connector (C:F41) shown in the connector sketch.

F: CONNECTOR SKETCH

• Each connector sketch clearly identifies the shape and color of a connector as well as terminal locations. Non-colored connectors are indicated in natural color.
• When more than two types of connector number are indicated in a connector sketch, it means that the same type connectors are used.

G: GROUND

Each grounding point can be located easily by referring to the corresponding wiring harness.

H: DIODE

A symbol is used to indicate a diode.

I: WIRE TRACING ON EXTENDED WIRING DIAGRAMS

For a wiring diagram extending over at least two pages, a symbol (consisting of the same characters with arrows), facilitates wire tracing from one page to the next. Example: A ↔ A, B ↔ B.

J: SYMBOLS OF WIRE CONNECTION AND CROSSING

Symbol 1: Refers to wires which are connected and branched at the "dot" point.
Symbol 2: Refers to wires which are crossed but not connected.

K: POWER SUPPLY ROUTING

A symbol is used to indicate the power supply in each wiring diagram. "MB-5", "MB-6", etc., which are used as power-supply symbols throughout the text, correspond with those shown in the POWER SUPPLY ROUTING in the wiring diagram. Accordingly, using the POWER SUPPLY ROUTING and wiring diagrams permits service personnel to understand the entire electrical arrangement of a system.

L: SYMBOLS AND ABBREVIATIONS

A number of symbols and abbreviations are used in each wiring diagram to easily identify parts or circuits.

M: ABBREVIATION LIST

Diagram Explanations

The document includes several diagrams to illustrate the concepts discussed:

Example Wiring Diagram

This diagram provides an example of how to read a wiring diagram. It shows a typical setup including a power supply routing, a main fuse box (M/B) and a fuse & relay box (F/B) with specific fuses (e.g., SBF-5 45A, F35, F37) and relays. It illustrates connections between components like Connector-1 and Connector-2, showing terminal numbers and wire colors (e.g., BR for Brown, BW for Black/White, R for Red, B for Black, YG for Yellow/Green). It also visually represents wire tracing and connection symbols.

Wire Connection and Crossing Symbols

Two symbols are explained: one showing wires connected and branching at a point marked with a dot [•], and another showing wires crossing each other without connection.

Wire Tracing Example

An example demonstrates how wires are traced across multiple pages using symbols like "A ↔ A" and "B ↔ B", indicating continuity between pages.