2025 Toyota 86 Service & Repair Manual

[+]Introduction INTRODUCTION HOW TO USE THE Electrical Wiring Diagram Contents of the Electrical Wiring Diagram (EWD) This document consists of the following sections. [A]: Introduction This section explains how to use the Electrical Wiring Diagram. [B]: System Circuit The circuit diagrams for the power sources, ground points and on-board systems can be viewed. (The wiring diagrams cover only the circuit connections between the power source and the electrical components) [C]: Location & Routing The locations of the wire harnesses, connectors and ground points can be viewed and the wiring diagrams are sorted into vehicle specific areas such as the engine compartment, instrument panel, etc. In addition, the relay location sections show the location of the relays, relay blocks, antennas, and ECUs, as well as the internal circuits. [D]: Fuse List The locations of the fuses and fusible links as well as the related systems are sorted into vehicle specific areas and can be viewed quickly. [E]: Connector List The connectors are organized by wire harness, and information for the connectors, ground points, related systems, component locations, and wire harness routings can be checked quickly. System Circuit The system circuit diagrams show electrical connections between the fuses and ground points of each system and are sorted into system functions. The power source circuit diagrams show the connections between the vehicle power source (on-board battery) and the fuses, and the ground point circuit diagrams show the connections between the ground points and the components.

[A]: Fuse The name and capacity of the fuse are shown. (For locations, refer to the Location & Routing section) [B]: Power Supply The ignition switch position that supplies the power to the fuse is indicated. [C]: Variations The information is given if connectors, wire connections, or wire colors are different depending on the vehicle model, engine type, specification, etc. How to Read Variation Information： Example 1：(*3, *4 *1) indicated by [b] shown on the wiring diagram above Read the information shown on the area indicated by [a]. *3:1NR-FE *4:1NZ-FE *1:w/ Stop & Start System A comma (,) between the symbols means “OR” and the absence of a comma (,) denotes “AND” in variation information, so the example (*3, *4 *1) mentioned above refers to the vehicle model that is equipped with the 1NR-FE "or" 1NZ-FE engine "and" the Stop & Start System. Example 2： (*4, *2) indicated by [c] shown on the wiring diagram above Read the information shown on the area indicated by [a]. *4:1NZ-FE *2:w/o Stop & Start System As explained above, the variation information (*4, *2) that has a comma between the symbols indicates the vehicle model that is equipped with the 1NZ-FE engine "or" not equipped with the Stop & Start System. [D]: Wire Color The color of the wire is indicated. Wire Color Codes: For example, if the wire is indicated by two color codes L and Y in the diagram, it means that yellow lines are on the blue sheath. Example: L-Y L Blue Y Yellow

Copper wires B=Black W=White BR=Brown L=Blue V=Violet SB=Sky Blue R=Red G=Green LG=Light Green P=Pink Y=Yellow GR=Gray O=Orange BE=Beige DG=Dark Gray Aluminum wires LA=Lavender [E]: Junction Block Connector Code The code refers to the connector that connects to the junction block. (For connector shapes, refer to the Relay Location under the Location & Routing section) Junction Block Connector *a This symbol leads to the internal circuit of the junction block. *b The number refers to a serial number assigned to one of the connectors that connect to the junction block. *c The alphanumeric code stands for the junction block connector. *d The number refers to the connector terminal number. *e The symbol that only shows a number inside stands for a relay block or fuse block. [F]: Switch Single switches are shown as a normally open switch. (For details about the switch on and off conditions, refer to the repair manuals) [G]: Ground Point Code The ground point code denotes a ground point. (For locations, refer to the Location & Routing section) Ground point code *a The first letter of the code indicates the alphabetic ID assigned to the wire harness. *b The other letter refers to the alphabetic ID assigned to the vehicle ground point. For example, code “MJ” denotes that wire harness M connects to ground point J. [H]: Wire-to-Wire Connector Code The code indicates the connectors that join two wire harnesses together. (For connector shapes, refer to the Connector List section) Wire-to-Wire Connector *a The number refers to the connector terminal number. *b The alphabetic code stands for the mated pair of wire harness connectors. For example, "FH" denotes the connection between the female connector(*1) of wire harness F and the male connector(*2) of wire harness H. *1: Connector terminals are female. *2: Connector terminals are male. *c The numeric code refers to the serial number assigned to one of the mated pairs of wire harness connectors. *d The symbol indicates the male terminal connector. [I]: Terminal Number The number indicates the connector terminal number. [J]: Connector Codes and Component Name The name of a system component and the connector codes of the connectors that connect to the system component are shown together. (For connector shapes, refer to the Connector List section) Part connector *a The number refers to the connector terminal number. Letter “G” refers to wire harness G. The exact name of wire harness G can be found in the Location & Routing section. *b The alphabetic code stands for the mated pair of wire harness connectors. The other code stands for the serial number assigned to one of the connectors of wire harness G. *c The code refers to the connector that connects to a component. *d The alphabetic code shown inside the parentheses is an ID code that distinguishes between the connectors if two or more connectors are connected to the same component. NOTE: The Electrical Wiring Diagram show the following wire harnesses for reference purposes only: component wire harnesses that belong to the components, and sub i h h b id b i i h d Example: Front Right Door

wire harnesses that serve as a bridge between a main wire harness and a component. These wire harnesses may not be included in the wiring diagrams or may be different from those used in the actual vehicles, so refer to the repair manuals when repairing or inspecting those wire harnesses. *1 Sub wire harness *a Refer to the repair manual for information on inspection and repair. *b Component wire harness Location & Routing The locations of the wire harnesses, connectors, components and so on are shown, and the diagrams are sorted into vehicle specific areas such as the engine compartment, instrument panel, etc. In addition, the Relay Location sections show the locations of the relays, relay blocks and antennas as well as the internal circuits. a. Location and Routing Diagram [A]: Wire Harness Code The alphabetic ID codes stand for each wire harness, and a wire harness code always comes first when it is combined with another code in order to represent a connector code of the connector that connects to a component, a wire-to-wire connector code or a ground point code. [B]: Connector Code of the Connector Connecting to the Component The code refers to the connector that connects to the component.

[C]: Wire-to-Wire Connector Code The code stands for the mated pair of wire harness connectors. [D]: Ground Point Code The code stands for a ground point. b. Relay Location The locations of relays, relay blocks (R/B), junction blocks (J/B), and fusible links (F/L) are shown. c. J/B (Junction Block), R/B (Relay Block), Inner Circuit, Power Distribution Box, and Short Connector The connectors, relays and fuses that connect to the junction blocks, as well as the internal circuits of the junction blocks are shown

shown. [A]: Connector Code The connector code of the wire harness connector is shown. [B]: Connector Codes and Terminal Numbers The connector codes and terminal numbers of the wire harness connectors are shown. [C]: Connector Shape and Terminal Numbers The shape of the wire harness connector is shown. The numbers shown on the connector shape refer to the connector terminal numbers. [D]: Connector Shape and Terminal Numbers The shape of the component connector is shown. The numbers shown on the connector shape refer to the connector terminal numbers. [E]: Fuse The name and capacity of each fuse are shown. Fuse List In this section, information for the locations of the fuses and fusible links and the related systems are organized by vehicle specific area and can be viewed quickly. Connector List

[A]: Name The name of the component to which the connector is connected is shown. [B]: Part Number The Toyota part number assigned to the connector is shown. [C]: Color The color of the connector is shown. [D]: Code The connector code of the connector is shown. (The connector codes are common to the system circuit diagrams and location and routing diagrams) [E]: Spec Specification differences such as vehicle models, engine types, etc. are shown. [F]: Wire Harness Repair Information on the wire harness repair can be accessed. [G]: Connector Shape and Terminal Numbers The connector shape and terminal numbers of the wire harness connector are shown. (The terminal numbers are common to the system circuit diagrams) [H]: Wire Color The wire colors can be checked through the tabular list by selecting the terminal numbers shown on the connector picture. [I]: Location The location and routing diagrams that include the connector are shown. [J]: System The system circuit diagrams that include the connector are shown. Guide to Read Connector Terminal Numbers View the connector mating face with the connector housing lock facing top. Female Connectors Viewing Direction *1 Housing Lock *a Viewing Direction (Mating Face) *b Connector Terminal

b Numbers Male Connectors Viewing Direction *1 Housing Lock *a Viewing Direction (Mating Face) *b Connector Terminal Numbers Exception： Some connectors need to be viewed with the connector housing lock facing left or right. *1 Housing Lock NOTE: Some of the connector housings are marked with numbers and these markings may be inconsistent with the connector terminal numbers shown on the wiring diagrams. In such a case, refer to the terminal numbers shown on the wiring diagrams, not to the connector housing markings, when conducting repair or inspection.

*1 Marking *a Housing markings and connector terminal numbers match. *b Housing markings and connector terminal numbers do not match. *c Connector Terminal Numbers Arbitrarily arranged connectors： The connecting terminals are arranged arbitrarily in the area, and the terminal numbers and wire colors shown in the circuit diagram may not match those of the vehicle. When repairing or inspecting, carefully check the vehicle connector and area in the circuit diagram before proceeding. NOTE: Inline Busbar Connector, etc. *a Arbitrarily arranged connectors are clearly indicated in the Specification column *b Same area *c Arbitrary arrangement of terminals in the same area

[+]Introduction GLOSSARY OF TERMS AND SYMBOLS GLOSSARY OF TERMS AND SYMBOLS Internal configuration of a block component's unit A symbol expressed with dotted lines stands for a logic circuit provided inside an internal unit, located in places such as relay blocks (R/B) and junction blocks (J/B). Since logic circuits cannot be replaced like independent parts, they are not shown in the external views for that block component's internal unit. BATTERY Stores chemical energy and converts it into electrical energy. Provides DC current for the auto's various electrical circuits. CAPACITOR (Condenser) A small holding unit for temporary storage of electrical voltage. DIODE A semiconductor which allows current flow in only one direction. FUSE A thin metal strip which burns through when too much current flows through it, thereby stopping current flow and protecting a circuit from damage. A heavy-gauge wire placed in high amperage circuits which burns through on overloads, thereby protecting the circuit. The numbers indicate the cross-section surface area of the wires. GROUND The point at which wiring attaches to the Body, thereby providing a return path for an electrical circuit; without a ground, current cannot flow. RELAY Basically, a relay is an electrically operated switch that is normally open. When an electric current flows through the small coil, a magnetic field is generated, which opens or closes the connected switch. RELAY, DOUBLE THROW A relay which passes current through one set of contacts of the other. TRANSISTOR A solidstate device typically used as an electronic relay; stops or passes current depending on the voltage applied at "base".

2025 Toyota 86 Service & Repair Manual

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