Introduction
NoteAll wiring connections between components are shown exactly as they exist in the vehicles. It is important to realize, however, that no attempt has been made on the schematics to represent components and wiring as they physically appear on the vehicle. For example, a 4foot length of wire is treated no differently in a schematic from one that is only a few inches long. Furthermore, to aid in understanding electrical (electronic) operation, wiring inside complicated components has been simplified.
Complete Circuit Operation
Each circuit is shown completely and independently in one set. Other components that are connected to the circuits may not be shown unless they influence the circuit operation.
Current Flow (1)
Each set normally starts with the component that powers the circuit, such as a fuse or the ignition switch. Current flow is shown from the power source at the top of the diagram to ground at the bottom of the diagram. A full representation of the power supply of a fuse or the power distribution from a fuse to various components is given in the Power and Ground Distribution Diagrams. Full representation of the ground connections are shown in the Power and Ground Distribution Diagrams.
Switch Positions (2)
Within a schematic, all switches, sensors and relays are shown "at rest" (as if the ignition switch were OFF).
Splices (3)
Splices directly connecting to the power distribution are best represented on the power distribution diagram in the Power and Ground Distribution Diagrams. Splices connected to grounds can be seen completely in the Power and Ground Distribution Diagrams. For all other splices, a reference is given to each off diagram where that particular splice can be best viewed.
Component Referencing (4)
Each component on a diagram has a reference to the component location view or the diagram where it is shown completely. It is located to the right of each component.
Component Names (5)
Component names are placed on the right hand side of each component when possible. Descriptions of the internals of the component are also included when available. The diagram where the component appears in full is listed in the Index. The base part number for a component is listed in parentheses next to or under a component.
Internal Name and Function Identification Numbers (6)
Some components on each diagram have internal symbols with an identification number located within it. You can identify the internal symbol or function by finding the corresponding number under the component name.
Fuse and Relay Information
Fuse and Relay Information contains a view of the fuse/relay box in which all fuses and relays are identified. Fuse and relay numbering and naming follow the indication of the fuse panel cover.
Power Distribution
Power and Ground Distribution Diagrams shows the current feed circuits. The current path is shown from the battery to the ignition switch and to all fuses. It also shows the circuits protected by each fuse. The circuit is traced from the fuse to the component. All details (wires, splices, connectors) between the fuse and the first component are shown.
Ground Distribution
Power and Ground Distribution Diagrams contains the diagrams that shows the complete details for each ground connection or main ground splice. This is useful in diagnosing a problem affecting several components at once (poor ground connection or ground splice). All details (wires, splices, connectors) between the ground point and the components are shown. These ground connection details are shown here in order to keep the individual set of diagrams as uncluttered as possible.
C904:
Component and Connector Information
Locations information that can be found at the vehicle level will help the user find where the various items depicted on the diagram can physically be found on the vehicle.
Component Location Views show the components and their connecting wires as they can be found on the vehicle.
Connector Views show the views of the pins and/or cavities of all connectors. The pin and cavity sides are shown separately as if the connector were disconnected. The color of the connector housing is indicated next to the connector number when available. The harness causal number is located above the component name and below the connector number. The circuit function charts are located below each connector.
WARNINGS
- Always wear safety glasses for eye protection.
- Use safety stands whenever a procedure requires being under a vehicle.
- Be sure that the Ignition Switch is always in the OFF position, unless otherwise required by the procedure.
- Set the parking brake when working on any vehicle. An automatic transmission should be in PARK. A manual transmission should be in NEUTRAL.
- Operate the engine only in a well-ventilated area to avoid danger of carbon monoxide.
- Keep away from moving parts, especially the fan and belts, when the engine is running.
- To prevent serious burns, avoid contact with hot metal parts such as the radiator, exhaust manifold, tailpipe, catalytic converter and muffler.
- Do not allow flame or sparks near the battery. Gases are always present in and around the battery set. An explosion could occur.
- Do not smoke when working on a vehicle.
- To avoid injury always remove rings, watches, loose hanging jewelry and avoid wearing loose clothing.
FIRE SUPPRESSION SYSTEM WARNINGS
- Always wear safety glasses when repairing vehicle equipped with fire suppression system and when handling the fire suppressors. This will reduce the risk of injury in the event of an accidental deployment.
- Never probe the connectors on the fire suppressors. Doing so can result in fire suppressors deployment, which can result in personal injury.
- The fire suppression module (FSM) orientation is critical for correct system operation. If a vehicle equipped with a fire suppression system has been involved in a collision in which the rear floor panel area has been damaged, inspect the mounting bracket for deformation.
If the mounting bracket is deformed, a new FSM must be installed whether or not the fire suppressors have deployed. In addition, make sure the area of the FSM mounting area is restored to its original condition.
- To reduce the risk of personal injury from a deployment while servicing the system, do not use any memory saver devices.
- To avoid accidental deployment and possible personal injury, the backup power supply must be depleted before reparing or replacing any fire suppression system components and before servicing, replacing, adjusting or striking components near the back seat, overhead console, fuel tank and when the vehicle is lifted in the air and work is performed in the rear axle area.
To deplete the backup power supply energy, disconnect the battery ground cable and wait at least one minute. Be sure to disconnect auxiliary batteries and power supplies (if equipped).
- Fire suppression system diagnostic tools are for service only. Tools must be removed prior to operating the vehicle over the road. Failure to remove the fire suppression system diagnostic tools could result in personal injury.
- To reduce the risk of personal injury from deployment while servicing the system, be sure that no person is under the vehicle and near the rear axle area when the battery ground cable is connected.
- Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage can result.
- The tightening torque of the fire suppression module (FSM) and fire suppressors retaining bolts is critical for correct system operation.
- Diagnosis of the fire suppression system must be performed with the fire suppression module (FSM) attached to the vehicle. Disruption of the FSM chassis to vehicle ground, while probing wiring, may result in fire suppressors deployment, which can result in personal injury.