Oem Wiring Diagram General Information Acura ZDX I

How to Use this Service Information

Information below describes how this service information is organized. They also explain what kind of information the articles contain, what the information means, and how to use it to troubleshoot electrical problems.

Circuit schematics break the entire electrical system into individual systems, such as the Back-up Lights. (Scheme 1) Only electrical components that work together are shown together, so you will not be distracted by unrelated wires.

Explanations of the abbreviations and symbols used in the schematics begin at Symbols . You will need to know what they mean before you can use a schematic effectively.

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 illustration, to ground at the bottom.

Shared Circuits

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.

Connectors

All in-line and junction connectors are numbered (C725, C416, etc.). Component connectors are not numbered but are identified either by the name of the component if the component only has one connector, or by a capital letter (A, B, C, etc.) if the component has more than one connector.

Below most connector numbers and component names are PHOTO and VIEW numbers. The PHOTO number refers to a photograph in the appropriate OEM COMPONENT LOCATION article of this service information that shows the connector's location on the vehicle. The VIEW number refers to an illustration in OEM CONNECTOR TERMINAL VIEWS article of this service information that shows the connector terminals, wire colors, connector cavity numbers, and other details.

The connector cavity numbering sequence begins at the top left corner of the connector as seen from either of the viewpoints shown in CONNECTORS - "C" . Except for the DLC (data link connector), disregard any numbers molded into the connector housing.

Wires

Wires are identified by the abbreviated names of their colors; the second color is the color of the stripe. Wires also are identified by their location in a connector. The number "2" next to the male and female wire terminals at C554, for example, means those terminals join in cavity 2 of connector C554.

Symbols

A complete description of schematic symbols begins in Symbols .

Circuit Schematics Sample. Scheme 1

Power Distribution Schematics

Power Distribution schematics show how power is supplied from the positive battery terminal to various circuits in the vehicle. Refer to the appropriate POWER DISTRIBUTION diagram in OEM CIRCUIT DIAGRAMS article to get a more detailed understanding of how power is supplied to the circuit that you are working on.

Individual circuit schematics begin with a fuse. So, 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.

Power Distribution Schematic Sample. Scheme 2

Ground Distribution Schematics

This sample Ground Distribution schematic shows all of the components that share the same ground point.

Ground Distribution Schematic Sample. Scheme 3

Connector Locations

To see where a component or connector is located on the vehicle, look up its photo number in the appropriate OEM COMPONENT LOCATION article. The photo also will tell you the color of the connector, and how many cavities it has.

Connector Location Sample. Scheme 4

If there is no photo number below or beside a component name or a connector, ground, or terminal number, look up that name or number in the appropriate OEM CONNECTOR TO HARNESS LOCATIONS article. The chart lists how many cavities a connector has, where it is located, and what it connects to. The related illustration shows the connector's location on the harness and the harness routing.

Connector And Harness Location Sample. Scheme 5

Connector Terminal Views

To see the configuration of a connector's cavities, look up its view number in the appropriate OEM CONNECTOR TERMINAL VIEWS article. 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 test a connector. They can be especially helpful if the connector has more than one wire of the same color. A dash symbol (-) indicates that the cavity is empty. The connector views also can be used to help diagnose multiple symptoms in separate circuits that could be caused by a single problem in a connector shared by those circuits. Here is how

1. Pick one of the multiple symptoms and look up the schematic for that circuit.
2. Make a list of all of the in-line and fuse box connectors in that schematic.
3. Then, in the appropriate OEM CONNECTOR TERMINAL VIEWS article, 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.

Example: The blower, rear window defogger, and the windshield wiper do not work. List all in-line and fuse box connectors in the blower controls circuit, and then check the appropriate OEM CONNECTOR VIEWS article (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, damaged terminals.

Connector Terminal Views

25. PCM

1. Left Side of Engine Compartment

Connector A

Scheme 6

1. BLK/WHT
2. On Left Engine Compartment Wire Harness (Scheme 6): Connector Terminal View Sample

Wire Color Abbreviations

The following abbreviations are used to identify wire colors in the circuit schematics

WIRE COLOR ABBREVIATIONS CHART

Wire insulation can be one color, or one color with another color stripe. (The second color is the color of the stripe.)

Wire Insulation Symbol. Scheme 7

This circuit continues on another illustration or at a different location in the same illustration. The arrow shows direction of current flow. To follow the RED/BLK wire in these examples, you would look for the "A" arrow on the following illustration or on the current illustration.

Current Flow Direction Symbol (Following Illustration). Scheme 8

Current Flow Direction Symbol (Current Illustration). Scheme 9

This means that the branch of the wire connects to another circuit. The arrow points to the name of the circuit branch where the wire continues.

Wire Circuit Connection Symbol. Scheme 10

A broken line means that this part of the circuit is not shown; refer to the appropriate diagram in OEM CIRCUIT DIAGRAMS for the complete schematic.

Broken Line Symbol (Circuit Not Shown). Scheme 11

Where separate wires join, only the splice is shown; for details on the additional wiring, refer to the appropriate diagram in OEM CIRCUIT DIAGRAMS.

Separate Wires Connection Symbol. Scheme 12

Wire choices for options or different models are labeled and shown with a "choice" bracket like this.

Wire Choices Symbol. Scheme 13

This broken line means that both terminals are in connector C134.

Broken Line Symbol (Terminals Are In Connector C134). Scheme 14

Connectors - "C"

The cavities and wire terminals in each connector are numbered starting from the upper left (locking tab up), looking at the male terminals from the terminal side or looking at the female terminals from the wire side. Both views are in the same direction, so the numbers are the same. The gender of the connector is determined by the pins within the connector. All cavities are numbered, even if they have no wire terminals in them.

Note. DLC terminals are numbered according to SAE standard J1962, not the Honda standard. The numbers of the four end terminals are molded into the corners of the connector face.

Connector Male Terminals And Female Terminals Symbol. Scheme 15

The connector cavity number is listed next to each terminal on the circuit schematic. The cavity/terminal shown to the right is #6.

Cavity/Terminal Symbol. Scheme 16

This means that the connector connects directly to the component.

Connector Symbol - Connects Directly To Component. Scheme 17

This means that the connector connects to a lead (pigtail) that is wired directly to the component.

Connector Symbol - Connects To Lead (Pigtail). Scheme 18

This symbol represents one bus bar inside the cap of a junction connector. A junction connector cap may contain several bus bars, but only the one affecting that circuit will be shown. The dots represent tabs on the bar that the wire terminals connect to.

Remaining wires to the same bus bar are represented by a dashed line.

Junction Connector Symbol. Scheme 19

Splices

Splices are shown as a dot. Their location and the number of wires may vary depending on the harness manufacturer.

Splices Symbol. Scheme 20

Components

A solid border line means that the entire component is shown.

Components Symbol (Entire Component Is Shown). Scheme 21

A broken border line indicates that only part of the component is shown.

Components Symbol (Only Part Of Component Is Shown). Scheme 22

The name of the component appears next to it followed by notes about its function along with any photo and connector view references.

Component Name And Function Symbol. Scheme 23

Ground - "G"

This symbol means that the end of the wire is attached (grounded) to the vehicle's frame or to a metal part connected to the frame.

Wire Ground Symbol. Scheme 24

Each wire ground (G) is numbered for reference.

This ground symbol (dot and 3 lines) overlapping the component means that the housing of the component is grounded to the vehicle's frame or to a metal part connected to the frame.

Ground Symbol (End Of Wire Grounded). Scheme 25

This symbol represents the bus bar inside a ground connector. The dots represent tabs on the bus bar that the wire terminals connect to. The ground symbol (large dot) is the connection between the bus bar and metal (grounded) part of the vehicle.

Ground Symbol (Bus Bar Inside Ground Connector). Scheme 26

Terminals - "T"

Each "T" terminal (ring type) is numbered for reference and location. A "T" terminal is secured with a screw or bolt.

Terminal Symbol. Scheme 27

Shielding

This diagram represents RFI (Radio Frequency Interference) shielding around a wire.

Shielding Symbol. Scheme 28

Switches

These switches move together; the broken straight line between them means that they are mechanically connected.

Switches Symbol (Switches Move Together). Scheme 29

Other types of switches are controlled by a coil or a solid state circuit. Unless otherwise noted, all switches are shown in their normal (rest) position, with power off.

Switches Symbol (Coil Circuit). Scheme 30

Switches Symbol (Solid State Circuit). Scheme 31

Fuses

This means that power is supplied when the ignition switch is in ON (II).

Fuse Symbol. Scheme 32

Diodes

A rectifier diode works like a one way valve. It allows current to flow only in the direction of the arrow.

Rectifier Diode Symbol. Scheme 33

A Zener diode blocks reverse current at normal voltages as does a rectifier diode. At high voltages, however, a Zener diode allows current to flow in reverse.

Zener Diode Symbol. Scheme 34

Light Emitting Diode (LED)

LEDs are special diodes that emit light when connected in a circuit. LEDs work the same as a rectifier diode by allowing current to flow only in one direction.

Light Emitting Diode Symbol. Scheme 35

Light

Light Sockets have two methods of wiring

Scheme 36

Scheme 37

1. They can be wired to a connector, which then hooks up to the socket
2. They can be hardwired directly to the socket. (Scheme 36): Light Symbol (Wired To Connector) (Scheme 37): Light Symbol (Hardwired Directly)

Motor

This symbol represents a DC voltage electrical motor. Motors can reverse direction by changing the polarity of the voltage.

Motor Symbol. Scheme 38

Pressure Sensor

A variable resistor is used to monitor the difference in pressure between the intake manifold and outside atmosphere (MAP Sensor). This information is used by the engine computer to monitor engine load (vacuum drops when the engine is under load or at wide open throttle). When the engine is under load, the computer alters spark timing and the fuel mixture to control performance and emissions.

Pressure Sensor Symbol. Scheme 39

Note. There is also an FTP (Fuel Tank Pressure) Sensor that is used to monitor EVAP System testing.

Resistor

This symbol represents a component in electrical circuits that resists the flow of electrical current. Resistance is measured in Ohms. Higher resistance results in less current flow. This type of resistor has a fixed resistance value.

Resistor Symbol. Scheme 40

Variable Resistor

This symbol represents a component in electrical circuits that resists the flow of electrical current. Resistance is measured in Ohms. Higher resistance results in less current flow. This type of resistor (thermistor) has a variable resistance value that changes with temperature. The resistance of a thermistor decreases as temperature increases.

Variable Resistor Symbol. Scheme 41

Solenoid

An electromagnet is produced by current flowing through a coil of wire. A plunger inside the wire coil is moved by the electromagnet, turning ON or OFF.

Solenoid Symbol. Scheme 42

Transistors

Transistors are electrical devices that have two key properties

Scheme 43

Scheme 44

1. They can amplify an electrical signal, and
2. They can switch ON and OFF, letting current through or blocking it as necessary. (Scheme 43): Transistor Symbol (Scheme 44): Transistor Symbol

Verify the Complaint

Turn on all the of components in the problem circuit to check the accuracy of the customer complaint. Note the symptoms. Do not begin disassembly or testing until you have narrowed down the problem area.

Analyze the Schematic

Look up the schematic for the problem circuit. Determine how the circuit should work by tracing the current paths from the power source through the circuit components to ground (certain circuits contain a "How the Circuit Works" article). Also, trace circuits that share wiring with the problem circuit. The names of circuits that share the same fuse, ground, or switch, and so on, are referred to in each circuit schematic. Try to operate any shared circuits that you did not check in step 1. If the shared circuits work, the shared wiring is OK, and the cause must be in the wiring used only by the problem circuit. If several circuits fail at the same time, the fuse or ground is a likely cause.

Based on the symptoms and your understanding of the circuit's operation, identify one or more possible causes.

Isolate the Problem by Testing the Circuit

Make circuit tests to check the diagnosis that you made in step 2. Keep in mind that a logical, simple procedure is the key to efficient troubleshooting. Test for the most likely cause of failure first. Try to make tests at points that are easily accessible.

Fix the Problem

Once the specific problem is identified, make the repair. Be sure to use proper tools and safe procedures.

Make Sure the Circuit Works

Turn on all components in the repaired circuit in all modes to make sure that you have fixed the entire problem. If the problem was a blown fuse, be sure to test all of the circuits on that fuse. Make sure that no new problems turn up and that the original problem does not recur.

Test Equipment

Test Light and DVOM

On circuits without solid-state devices, use a test light to check for voltage. A test light is made up of a 12 volt bulb with a pair of leads attached. After grounding one lead, touch the other lead to various points along the circuit where voltage should be present. The bulb will glow if there is voltage at the point being tested. If you need to know how much voltage is present, use a digital volt/ohmmeter (DVOM). If, in addition, you need to know exactly how much resistance there is between two points, use a digital volt/ohmmeter (DVOM).

In the "OHMS" range, the DVOM will measure resistance between two points along a circuit. Low resistance means good continuity.

Diodes and solid-state devices in a circuit can make a DVOM give a false reading. To check a reading, reverse the leads, and take a second reading. If the readings differ, the component is affecting the measurement.

Jumper Wire

Use a jumper wire to bypass an open circuit. A jumper wire is made up of an in-line fuse holder connected to a set of test leads. It should have a five ampere fuse. Never connect a jumper wire across a short circuit. The direct battery short will blow the fuse.

Identifying Fused Jumper Wire. Scheme 45

To order test equipment, contact your local tool supplier. For a list of suppliers and tool numbers, refer to Honda Required Special Tools and Equipment Service Bulletin.

Before Troubleshooting

1. Check the main fuse and the fuse box.
2. Check the battery for damage, state of charge, and clean and tight connections. CAUTION: Do not quick-charge a battery unless the battery ground cable has been disconnected, or you will damage the alternator diodes. Do not attempt to crank the engine with the ground cable disconnected, or you will severely damage the wiring.

Scheme 46

1. Make sure that connectors are clean and have no loose terminals or receptacles.
2. Make sure that connectors without wire seals are packed with dielectric (silicone) grease (Part Number: 08798-9001). (Scheme 46): Identifying Connectors Packed With Dielectric (Silicone Grease)
3. When connecting a connector, push it until it "clicks" into place. CAUTION: Do not pull on the wires when disconnecting a connector. Pull only on the connector housings. Most circuits include solid-state devices. Test the voltages in these circuits only with a 10-megaohm or higher impedance digital multimeter. Never use a test light or analog meter on circuits that contain solid-state devices. Damage to the devices may result.

Testing for Voltage

When testing for voltage at a connector without wire seals, you do not have to separate the two halves of the connector. Instead, probe the connector from the back. Always check both sides of the connector because dirty, corroded, and bent terminals can cause problems (no electrical contact = an open).

Scheme 47

1. Connect one lead of the test light to a known good ground, or, if you are using a digital volt ohmmeter (DVOM), place it in the appropriate DC volts range, and connect its negative lead to ground. (Scheme 47): Testing For Voltage At Connector Without Wire Seals
2. Connect the other lead of the test light or DVOM to the point you want to check.
3. If the test light glows, there is voltage present. If you are using a DVOM, note the voltage reading. It should be within one volt of measured battery voltage. A loss of more than one volt indicates a problem. NOTE: Always use a DVOM on high impedance circuits. A test light may not glow (even with battery voltage present).

Testing for Continuity

When testing for continuity at a connector without wire seals, you do not have to separate the two halves of the connector. Instead, probe the connector from the back. Always check both sides of the connector because dirty, corroded, and bent terminals can cause problems (no electrical contact = an open).

Scheme 48

1. Disconnect the negative cable from the battery. If you are using a DVOM, place it in the lowest "OHMS" range.
2. Connect one lead of a DVOM to one end of the part of the circuit you want to test. (Scheme 48): Testing For Continuity At Connector Without Wire Seals
3. Connect the other lead to the other end.
4. If you are using a DVOM, a low reading or no reading (zero), means good continuity.

Testing for Voltage Drop

Wires, connectors, and switches are designed to conduct current with a minimum loss of voltage. A voltage drop of more than one volt indicates a problem. Circuits must be operating when checking voltage drop.

Scheme 49

1. Place the digital volt/ohmmeter (DVOM) in the appropriate DC volts range. Connect the positive lead to the end of the wire (or to the connector or switch) closest to the battery. (Scheme 49): Testing For Voltage Drop
2. Connect the negative lead to the other end of the wire (or the other side of the connector or switch).
3. Turn on the components in the circuit.
4. The DVOM will show the difference in voltage between the two points. A difference, or drop, of more than one volt indicates a problem. Check the circuit for loose, dirty, or bent terminals.

Scheme 50

1. Remove the blown fuse and disconnect the load.
2. Connect a test light or digital volt/ohmmeter (DVOM), switched to the appropriate DC volts range, across the fuse terminals to make sure voltage is present. You might have to turn the ignition switch to ON; check the schematic to see. (Scheme 50): Testing For Short With Test Light
3. Beginning near the fuse box, wiggle the harness. Continue this at convenient points about six inches apart while watching the test light or DVOM.
4. Where the test light goes off, or the DVOM voltage drops to zero, there is a short to ground in the wiring near that point. NOTE: Always use a DVOM on high impedance circuits. A test light may not glow (even with battery voltage present).

Trim Level Matrix

The Trim Level Matrix is used to determine the option content of the various trim levels of a vehicle. Option qualifiers are used to define option content throughout this service information. When an option qualifier is located, the Trim Level Matrix can be used to determine its application. A dot represents when an option qualifier applies to a certain trim level. An "O" represents an option qualifier is optional on a certain trim level, while an "A" represents an accessory is available for a certain trim level.

Trim Level Matrix. Scheme 51

See also:
• Symbols
• CONNECTORS - "C"