Servicing the Electrical System
When servicing the electrical system, disconnect the negative cable from the terminal of the battery.
CAUTION: Before connecting or disconnecting the negative cable, be sure to turn off the ignition switch and the lighting switch. (If this is not done, there is the possibility of the semiconductor parts being damaged.)
Secure the wiring harnesses by using clamps so that there is no slack. However, for any harness which passes to the engine or other vibrating parts of the vehicle, allow some slack within a range that does not allow the engine vibrations to cause the harness to come into contact with any of the surrounding parts, and then secure the harness by using a clamp.
In addition, if a mounting indication mark (yellow tape) is on a harness, secure the indication mark in the specified location.
If any section of a wiring harness interferes with the edge of a part, or a corner, wrap the section of the harness with tape or something similar in order to protect it from damage.
When installing any of the vehicle parts, be careful not to pinch or damage any of the wiring harnesses.
If a burned-out fuse is to be replaced, be sure to use only a fuse of the specified capacity. If a fuse of a capacity larger than that specified is used, parts may be damaged and the danger of fire also exists.
The sensors, relays, etc.. must never be subjected to strong shocks. Do not allow them to fall and do not throw them when handling.
The electronic parts used in the computer, relays, etc.. are readily damaged by heat. If there is a need for service operations that may cause the temperature to exceed, 80°C (176°F), remove the electronic parts beforehand.
Loose connectors could cause troubles. Make sure that the connectors are connected securely.
Circuits using shielded wires prevent the effects of ignition noise, radio interference, etc.. If shielded wires are defective, replace as a harness assembly.
If additional optional equipment is to be installed in the vehicle, follow the procedure listed; however, be sure to pay careful attention to the following points:
1. In order to avoid overloading the wiring, take the electrical current load of the optional equipment into consideration, and determine the appropriate wire size.
2. Where possible, route the wiring through the existing harnesses.
3. If an ammeter or similar instrument is to be connected to a live-wire circuit, use tape to protect the wire, use a clamp to secure the wire, and make sure that there is no contact with any other parts.
4. Be sure to provide a fuse for the load circuit of the optional equipment.
5. The 0.3 mm(2) size cables are intended for use in limited applications such as the electrical signal circuits, indicator light and illumination light circuits. They must not be used in the other applications.
When disconnecting a connector, be sure to pull only the connector, not the harness.
Disconnect connectors which have catches by pressing in the direction indicated by the arrows in the illustration.
Connect connectors which have catches by inserting the connectors until they snap.
When using a circuit tester to perform continuity or voltage checks on connector terminals, insert the test probe from the harness side.
If the connector is a sealed connector, insert the test probe in through the hole in the rubber cap for the electrical wires, being careful not to damage the insulation of the wires; continue to insert the test probe until it contacts the terminal.
When shield connectors are connected or disconnected, pay attention to the following points.
1. If there are mud, dirt, dust and other deposits on part A (0-ring), clean in silicone oil. If O-ring is damaged, replace.
2. If there are oil, mud, dirt, dust and other deposits on surfaces B, clean in silicone oil.
3. Check to ensure that part C (rubber plug) is held securely in the connector housing.