Main Computer Step 2 - A wiring harness is used to connect various devices and sensors to either control, or send feedback data to the computer. The harness is also used to control the lighting system such as brake lights.
Wiring Harness Step 3 - A wiring harness has many connectors that serve as an extension which allows routing to devices which are obscurely located.
Wiring Harness Connector
Electrical Connector Disassembled Step 5 - A device connector is used to connect to a particular item such as an ignition coil which is shown here. A safety is used to securely attach the connector to a device, which adds an extra layer of protection from accidental disconnection. This safety clip must be removed before the connector can be released.
Electrical Connector with Safety Step 6 - An electronic throttle control actuator is responsible for metering air flow into the engine which control engine RPM (revolutions per minute.) Using a throttle control sensor located near the foot pedal supplies feedback data to the computer. The throttle control system is integrated into the ABS, cruise control and traction control systems. In older vehicles throttle action was performed by a manually controlled throttle cable, which was actuated by the drive's right foot.
Electronic Throttle Actuator