Electrical System

Electrical Parts




Battery cable
Before disconnecting connectors or removing electrical parts, disconnect the negative battery cable.




Wiring Harness
To remove the wiring harness from the clip in the engine room, pry up the hook of the clip using a flathead screwdriver.

Connectors

Disconnecting connectors




- When disconnecting connector, grasp the connectors, not the wires.




- Connectors can be disconnected by pressing or pulling the lock lever as shown.




Locking connector
When locking connectors, listen for a click indicating they are securely locked.

Inspection




- When a tester is used to inspect for continuity or measuring voltage, insert the tester probe from the wiring harness sidle.




- Inspect the terminals of waterproof connectors from the connector sidle since they cannot be accessed from the wiring harness sidle.

CAUTION: To prevent damage to the terminal, wrap a thin wire around the tester probe before inserting into terminal.

Terminals




Inspection
Pull lightly on individual wires to verify that they are secured in the terminal.




Replacement
- Use the appropriate tools to remove a terminal as shown. When installing a terminal, be sure to insert it until it locks securely.
- Insert a thin piece of metal from the terminal sidle of the connector and with the terminal locking tab pressed down, pull the terminal out from the connector.




Sensors, Switches, and Relays
Handle sensors, switches, and relays carefully Do not drop them or strike them against other objects.

Wiring Harness







Wiring color codes
- Two-color wires are indicated by a two-color code symbol.
- The first letter indicates the base color of the wire and the second the color of the stripe.

Fuse

Replacement




- When, replacing a fuse, be sure to replace it with one-of-the same capacity. If a fuse fails again, the circuit probably has a short and the wiring should be inspected.
- Be sure the negative battery terminal is disconnected before replacing a main fuse.




- When replacing a pullout fuse, use the fuse puller.

Electrical Troubleshooting Tools




Jumper wire
A jumper wire is used to create a temporary circuit. Connect the jumper wire between the terminals of a circuit to bypass a switch.

CAUTION: Do not connect a jumper wire from the power source line to a body ground. This may cause burning or other damage to wiring harnesses or electronic components.




Voltmeter
The DC voltmeter is used to measure circuit voltage. A voltmeter with a range of 15 V or more is used by connecting the positive (+) probe (red lead wire) to the point where voltage will be measured and the negative (-) probe (black lead wire) to a body ground.




Ohmmeter
The ohmmeter is used to measure the resistance between two points in a circuit and to inspect for continuity and short circuits.

CAUTION: Do not connect the ohmmeter to any circuit where voltage is applied. This will damage the ohmmeter.

Precautions Before Welding

A vehicle has various electrical parts. To protect the parts from excessive current generated when welding, be sure to perform the following procedure.

1. Turn the ignition switch to the LOCK position.




2. Disconnect the battery cables.




3. Securely connect the welding machine ground near the welding area.
4. Cover the peripheral parts of the welding area to protect them from weld spatter.