Symptom: turn signal does not work.
    Diagnosis and analysis: After inspection, the car turns on the left side of the turn signal switch turn light does not light, open the right turn signal is working properly, open the dangerous warning switch, the system can work properly.
    According to the circuit diagram we can see that the steering lights with No. 15 fuse, dangerous warning light switch with No. 14 fuse. Check the turn around the bulbs are good, the fuse is also normal. As the car installed the anti-theft device, with the remote control remote control car lock when the turn lights are bright, for which I suspect that the installation of anti-theft device is caused, so decided to open the anti-theft device to determine the cause of the malfunction. But after the demolition of the anti-theft, the fault remains the same. Asked the user that the anti-theft device has been installed for more than a year, can turn the lamp failure is only recently appeared. By carefully analyzing the circuit diagram and the actual fault symptoms of the vehicle, the author initially determines that the fault is on the line between the hazard warning light switch and the battery. When measuring several terminals at the danger warning light switch with a digital multimeter, it is found that terminal 1 has no power when the ignition switch is turned on. Normally this terminal should have a voltage of 12V. But check the fuse box located in the dashboard under the 15 fuse normal, with a digital multimeter to measure the fuse also has 12V voltage, according to the above test results, you can determine the fault out of the dashboard in the dashboard to the danger warning Light switch on the yellow terminal of terminal 1.
    Through the inspection of this line, and finally found the point of failure, the original is the installation of anti-theft device when the host fixed to the rear of the line, so that after a long bump, resulting in this line virtual access, resulting in The occurrence of the above failure.
    Troubleshooting: Troubleshoot the host of the anti-theft device after the correct fix.