Circuit design requirements:

1. Power distribution:

1.1 Location allocation:

A. The principle of choosing the nearest location for power distribution: The general electrical box is divided into three parts: appearance, front compartment, battery. The principle of choosing the nearest power distribution is to reduce the number of wires used, such as: low beam lights, high beam lights, front fog lights All are in the front cabin orientation, so the low beam light, high beam light, front fog lamp relay fuse are placed on the front cabin electrical box.

B. The battery electrical box mainly houses the main power supply.

C. Several special placement requirements:

(1) The turn signal relay needs to be placed in the cockpit so that the driver can perceive the movement of the turn signal relay.

The brake light relay needs to be placed in the electrical compartment of the front cabin, which will cause noise to the driver occupants in the cockpit, use a silent relay in the cockpit. But try to choose the way to put the electric box in the front cabin, unless the customer requires it.

1.2 System allocation:

(1) Distribution of constant power supply:

A. The power supply allocated to the constant electricity is the equipment that still needs to be operated to close the incineration switch: indoor delay light, anti-theft system, trunk light, horn, small light (azimuth light), diagnostic system, backup power supply, brake light, various Controller's memory power supply, alarm light operation power supply of various electrical systems, etc.

B. The power source allocated to the normal electricity also includes the equipment directly connected to the normal electricity after being controlled by the incineration switch: cooling fan motor, blower, low beam, high beam, front fog lamp, wiper, rear defrost, engine, Compressors, oil pumps, etc.

(2) Distribution of incineration switching power supply:

ACC file: Equipment that needs to be disconnected when the engine is started (sound system, cigarette lighter, power socket, electric rearview mirror, etc.)

IG2: Equipment that needs to be disconnected when the engine is started (air conditioning blower control power supply, electric heating defrost, electric sunroof, seat heating, electric window, wiper spray system, etc.)

IG1: the ON gear, which is still powered when the ST is turned on, the equipment that can be used when the engine is started must be allocated to this gear (appearance, electronic injection ECU, ABS, BCM, airbag, reversing light, etc.)

ST: Start the motor. After the release, the key will return to the ON position. In this direction, the load of the ACC position IGN position 2 is powered off, so that more power is available to start. This gear only supplies power to the engine motor does supply power to other equipment.

Note: Each gear of the incineration switch has a current-carrying requirement, so the equipment allocated to each gear needs to calculate the current for distribution. The total current of the equipment allocated to each gear cannot exceed the load current of each gear.