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Abstract: with the progress of science and technology, in order to deal with the escalating means of vehicle theft, people have developed various generation of different kinds of anti-theft devices. Different periods of burglar alarm have different structures and functions, followed by different faults. The following is an example of Buick bridge in Shanghai, which shows that the anti-theft system is troubleshooting. A 2012 Shanghai Buick sedan. The engine does not rotate, the burglar indicator lights about 5S, and then goes out. Fault diagnosis: the picture shows the circuit of Shanghai Buick automobile anti-theft system. Fault diagnosis and elimination are as follows. Step 1: place the shift lever in the "P" position and place the ignition switch in the "start" position. Use the digital multimeter to read the terminal S (purple line) of the starter electromagnetic coil to the ground voltage value, if the voltage is less than 9.5 V and turns to step three; if the voltage value is greater than 9.5 V, turn to step two. Step two: in the battery power and starter electromagnetic coil terminal S (purple line) between a remote start switch, start starter. If the starter can rotate, check whether the starter's circuit is connected with bad or high resistance, and repair it when necessary; if the starter does not turn, change the coil of the starter. Step three: put the ignition switch in the "start" position and use the digital multimeter to read the voltage value of the ignition switch terminal D6 (yellow line) to the ground. If the voltage value is equal to or greater than 9.5 V, step five is carried out; if the voltage value is less than 9.5 V, step four is performed. If the voltage value is not less than 9.5 V, the ignition switch should be replaced. If the voltage is less than 9.5 V, it should be seen whether the fuse connected to the red line is good. If the circuit breaks, the insurance should be replaced. Step five: disconnect the anti-theft relay joint, put the ignition switch in the "start" position, use the digital multimeter to read the voltage value between the A12 (yellow line) and the ground, if the voltage value is equal to or greater than 9.5 V, step six; if the voltage value is less than 9.5 V, the ignition switch connector will be explained. There is a circuit breaker between the terminal B6 and the anti-theft relay. Step six: a test lamp is connected to the ground between the C2 (yellow line) and the ground. The ignition switch is placed in the "start" position. If the test lamp is not bright, turn to step eight. If the test lamp is bright, a test lamp is connected to the power supply of the storage pool with the A1 (yellow / black line) and the ignition will be ignited. The switch is placed in the "start" position to observe the test lights. Step seven: if the test light is not bright, check whether the Yellow / black line between the A1 and the anti-theft component joint terminal A4 is broken or short circuited with the power supply, check whether the anti-theft component is not connected. If the connection of the Yellow / black line is normal, the anti-theft component should be replaced. If the test lamp is bright, the connection condition of the anti-theft relay should be considered. If the connection is normal, the security relay needs to be replaced. Step eight: disconnect the transmission gear switch joint, connect a test lamp between its terminal E (purple line) and ground, place the ignition switch in the "start" position, observe the test lamp, turn to step nine if the test lamp is not bright, and if the light is tested, it should check the terminal C2 of its terminal G and the anti-theft relay. The yellow line between them is to see if the yellow line is open or high resistance. If the above conditions do not exist, the transmission shift switch should be adjusted or replaced. Step nine: a test lamp (about 50 W) is connected between the fuse terminal B7 (yellow line) of the dashboard and the ground, and the ignition switch is placed in the "start" position and the test lamp is observed. If the test lamp is not bright, the yellow line breakage between the fuse terminal B7 (Huang Shaixian), the ignition switch terminal B6 and the anti-theft relay terminal A2 is explained and then transferred to step ten after repair. Step ten: a test lamp (about 50 W) is connected between the fuse terminal B7 (yellow line) of the dashboard and the ground, and the ignition switch is placed in the "start" position and the test lamp is observed. If the test lights are on, you should check the connection of the yellow line between the transmission terminal switch terminal G and the anti-theft relay terminal C2. If the connection is good, the fuse needs to be replaced, or is there any open circuit fault between the transmission terminal switch terminal E and the instrument panel fuse terminal B8?