The working principle and fault diagnosis of the lighting regulation circuit of the prince brand car Xu Lichao Department of Traffic Engineering, Huaiyin Institute of Technology, Huaiyin 223300, Jiangsu) The driver knows. When driving at night, if the brightness of the instrument panel is too large, it will easily cause visual fatigue, but if you can adjust the brightness of the light according to your actual needs, this situation will be greatly improved. The prince brand car lighting adjustment circuit is a circuit that adjusts the brightness of the instrument panel lighting and various switch position indicator lights around it. It consists of various lamps and lighting adjustment switches and lighting adjustment relays. According to actual needs, the brightness of the illumination can be arbitrarily adjusted to avoid fatigue caused by excessive brightness and affect driving safety. In order to let everyone have a deeper understanding of the working principle of the circuit and the diagnosis of the fault, it is introduced as follows.
1Structure and working principle 1.1 Lighting adjustment switch The lighting adjustment switch of the Prince car and the intermittent adjustment switch of the wiper are combined. In order to avoid the circuit diagram being too complicated and disorderly, the author only specifies the lighting adjustment in the lighting adjustment circuit.ç’‡K5* lighting adjustment relay s13-lighting adjustment switch lighting adjustment circuit diagram lighting adjustment switch S-3 is a variable resistor, see, its total resistance between the 4th and 3rd terminals is about 9k! , regardless of the position of the switch. Terminal 8 is the switch position signal output terminal, and the resistance value between it and the No. 4 terminal changes with the switch position. When the switch is adjusted to the brightest position, it is about 9k! The darkest position is 0! .
The 5V voltage supplied by the lighting adjustment relay is supplied to the lighting adjustment relay after being adjusted by the changed switching resistance. The voltage between the No. 8 terminal and the No. 3 terminal of the switch changes with the position of the switch, and the switch is in the brightest position. It is 4V, and it is 0V in the darkest position. That is, the voltage signal that changes with the switch position is supplied to the lighting adjustment relay, so that the lighting adjustment relay accurately senses the position of the switch.
1.2 Lighting adjustment relay The lighting adjustment relay of the Prince car is located in the relay box on the upper part of the accelerator pedal. Because its color is blue, it is easy to distinguish it from other relays.
The No. 15 terminal of the lighting adjustment relay is connected to the No. 21 fuse through the gray-green wiring, and the No. 21 fuse is connected to the No. 58 line at the upper end of the circuit diagram. When the illumination switch is in the first gear, the 58th line is only available. The current is supplied to the terminal of the lighting adjustment relay No. 15 to supply 12V. The 31st terminal of the lighting adjustment relay is connected to the grounding wire. The terminals of No.15 and No.31 are connected to the working power supply of the lighting regulating relay, and the 31b terminal is connected to the grounding wire of various lamps required for lighting adjustment. When the light switch is in the first gear, the 12V voltage is supplied to all the bulbs connected to it. The lighting adjustment relay adjusts the brightness of the illumination by adjusting the signal that enters the 31st ground terminal through the 31b terminal and changes according to the switch position.
The 58a, 58b, and 585 terminals of the lighting adjustment relay are all connected to the line of the illumination adjustment switch. When the illumination switch is adjusted to the first gear to supply power to the 15th terminal, a 5V reference voltage is formed on the 58b terminal. The 58 terminal is a ground wire, and the 58 terminal is a signal voltage terminal that senses a change in the position of the switch.
2 Fault diagnosis Various lights connected to the lamp of the lighting adjustment relay 31b are not lit.
Remove the lighting adjustment relay from the connector and set the illumination switch to 1 step.
Use the meter to check whether there is voltage at the No. 15 terminal of the connector of the lighting adjustment relay. If there is no voltage, the fuse is blown or the wiring from the fuse to the terminal No. 15 of the connector is broken.
12V), if there is no voltage, the fuse is blown or the wiring from the various lamps to the connector 31b is broken.
Detect the resistance between terminal 31 and ground, if not 0! , indicating that the grounding is bad.
Check the switch. Remove the lighting adjustment relay and check the resistance between its terminals 58b and 58. At this time, it should be about 9k! Resistance value. If the resistance is infinite, it means that the switch is bad or the connector wiring from the switch to the relay is open. If no open circuit is found when checking the wiring, the switch should be replaced; if the resistance between the 58b and 58 terminals is normal, then 58 is detected. The resistance value between the terminal and the 58 terminal, when the switch is turned, if the resistance between the terminals is 0! The darkest time) to 9k! If it changes between the brightest and the brightest, it is normal; if there is no change, check whether the wiring from the switch to the 58 terminal is open or shorted. If there is no abnormality in the wiring, the switch should be replaced. If no fault is found in the inspection of a~e, it indicates that the lighting adjustment relay is faulty and should be replaced.
Although all kinds of lights can be bright, turning the lighting adjustment switch can not adjust the brightness of the illumination.
This phenomenon occurs, indicating that the wiring from the various illumination lamps to the terminal of the illumination adjustment relay 31b is short-circuited or the illumination adjustment switch and the illumination adjustment relay are malfunctioning.
In order to check whether the wiring is short-circuited, turn the light switch to the first gear and remove the lighting adjustment relay from the connector. If all the lights are off at this time, the relay is normal; if not, the relay 31b is indicated. The terminal is shorted on the vehicle body. If the relay is normal and the above fault occurs, it indicates that the switch position perceived by the lighting adjustment relay is at the brightest position, and that the terminal of the lighting adjustment relay always supplies more than 4V, that is, the lighting adjustment relay This fault occurs when the 58 terminal is open or when the 58-terminal eleven side wiring is short-circuited.
To check if the wiring is short-circuited, turn the switch to the 1st position and check the voltage at the terminal of the relay connector 58. If there is voltage, the wiring is short-circuited.
Check the switch operation. Remove the lighting adjustment relay from the connector and check the resistance between the terminal 58b and the 58 terminal. If the resistance reaches about 9k! , it is normal; if there is an infinite value, it means that the wiring from the 58 terminal to the switch has an open circuit. To further check the switch, the switch can be adjusted while detecting the connection between the terminals 58 and 58 of the lighting adjustment relay. resistance. If the brightest position is about 9k! The darkest position is 0! , indicating that the switch and wiring are normal, in this case, the lighting adjustment relay should be replaced. However, if there is no change in the resistance value, the switch is faulty and needs to be replaced.
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