Fault phenomena
A 2010 santa fe 2. 0 multi-purpose vehicle with a d engine travelling approximately 30,000 km. The owner of the vehicle reflected the sudden breakdown of the lifting and landing of the four windows. Prior to coming to my shop, it had been repaired at the complex but had not been repaired。
Fault analysis:
First, there is a need to understand the working principles of electric windows. When the ignition switch is turned on, the electrical vehicle window relay is activated by the lifting and drop control unit, when the current enters the separate switch through the main switch and completes the circuit once through the extended contact point into the corresponding generator. The work of the electric window power plant is two-way, i. E. When the main switch is changed in direction, because of a change in the direction of the initial current, the electric power plant will rotate in the opposite direction, thus enabling the lifting or lowering of the window glass。
When the malfunction vehicle arrived at the shop, the maintenance staff opened the ignition switch and operated the driver's side door main switch. It was found that the main switch was unable to control the lifting and down of the windows of the four doors, which were then tested for the separation of the three other doors and for lack of control over the lifting and down. Since the main switch had an operating card phenomenon, the maintenance staff suspected the main switch to be malfunctioning. When the main switch was replaced, it was found that the failure remained. So i found the pen guy to work with。
Since the problem is not on the main switch, why can't the four doors go up or down? The possibility of simultaneous failure at three separate switches is extremely low and could be temporarily dismissed. An analysis of the causes of the failure may include the following: failure of the electro-lifting and landing control unit; failure of the electrical vehicle window relay; failure of the main public circuit; or failure of the fuse or of the iron。
According to the circuit chart (figure 1), the author first checked the 30-a-melt of the electric vehicle window lift system, without melting or failure. Measurement of electrical vehicle window relays is 12. 46 v, normal. The relay was measured 83 times, and met the requirements. The short relay test found that four glass items were still unable to rise or fall. The electric vehicle window relay was then driven by a diagnostic device and it was found that the relay voltage output was normal. Relays can be determined to be non-functional. Additional measurements of foot 5 of ip-h and foot 1 of ip-j, respectively, revealed no external power output. Since the trunking boxes are properly entered, the relays are functioning normally, but there is no output power, and there is clearly a malfunction within the trunk. Wireboxes were replaced with other vehicles and were found to have broken off internally (figure 2). As a result, the new cockpit trunking box was replaced and repeated car failure was not repeated。
On the seventh day after the repairs, the vehicle entered the plant for the same failure. The difference, however, is that this split is working properly and the main switch is not. As a result of the replacement of the switchbox for the previous maintenance, the maintenance staff doubted whether it would be due to the failure of inspections, which would result in a further malfunction. The switchboard was first checked and no burn marks were found. Careful measurements were then made to determine that the malfunction was not caused by the switchboard. As a result, routine checks were carried out to measure the green line of foot 10 of the electric car window using a universal watch. The electricity voltage of 12v was found to be measurable, but based on experience, it was assumed to be a voltage-free fraction. Test light is used to measure, and the test light is not on. The type of vehicle had previously suffered from faults in lifting wire beams because the driver's side door had been opened too wide. A close examination of the beams near the md01 plug-in found no breakout. This area continues to be measured to the 10 foot guide of the electric vehicle window, excluding the possibility of cutting the cords as a result of the glass elevator action on the driver's side. However, when the md01 plug-in was checked, it was found that the power was still out of order, and it was prepared to check the guidance between the md01 plug-in to the mm02 plug-in and the mm02 plug-in to the cockpit switch box. When the mm02 plug-in was checked, it was felt that the break-in was exhausting, and when it was pulled out with great energy, it was found that the plug-in had caused severe burns as a result of the failure. As the site was not last repaired at the shop, this should have been due to inappropriate operations during the maintenance of the complex。
(c) fault removal: careful handling of plugs to prevent further burning, processing and reloading of the vehicle, and troubleshooting. A week later, the client was called back, the failure was not repeated, the client was satisfied and the failure was completely eliminated。
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