Example 1 car remote control failure: car's anti-theft system is working properly and car won't start
Symptom:
The car's anti-theft system is working properly. The ignition engine is working properly. But car won't start.
Reason analysis:
This phenomenon may be caused by an alarm or an electrical problem in vehicle. The evaluation method is as follows: short two thick wires of ignition relay (12V/30A, usually located near car key door) when car is installed with an anti-theft device. If car can start at this time, it means that anti-theft system is faulty and basically damaged. If car still does not start after two thick wires of ignition relay short circuit, it means that circuit of car itself is faulty. In addition, vehicle is running. When encountering a bumpy section of road during process, it is easy to turn off engine or turn off engine instantly. Particular attention should be paid to fact that normally closed contact of ignition relay is not making good contact or wiring is loose.
Car remote control failure example 2: remote control button failure
Symptom:
The function key on remote control is invalid. The LED indicator is off when key is pressed.
Reason analysis:
Failure of a function key (other function keys are normal) is most often due to damage to function key or soldering of key pins and PCB solder joints.Waterproof.Protect against drops and strong pressure. .
Car remote control failure example 3: anti-theft system re-operation
Failure phenomenon: The car will automatically turn off after driving for about 30-40 seconds and enter alarm state. After disabling anti-theft function, repeat above situation while driving. Repeat.
Cause analysis: This phenomenon is related to operation of remote control in car, causing second automatic anti-theft function. Simply press anti-theft release function key, open and close door again. The problem may be Restrictions. Function keys usually do not exceed four. Thus, each key is often assigned multiple functions. In a certain state, functions controlled by same function key are different. Or a certain function is performed by several keys. Special attention.
Car remote control failure example 4: No response to remote control operation
Symptom:
When remote control is not in use, LED indicator often lights up by itself. Or, as long as battery is installed, LED indicator will always be on. But there is no reaction to operation of remote control. .
Reason analysis:
When remote control does not press a button, indicator often lights up by itself. As a rule, remote control button has mechanical damage. The performance is that button has a bad feel and no elasticity. Just replace button. For remote control with code switching. No response to pressing function keys of remote control. After replacing battery or reinstalling battery, LED indicator lights up for 20-40 seconds. Then there is no reaction. This means that keys are shorted and damaged. Check every button on road. Then replace short circuit button.
Car remote control failure example 5: remote control anti-theft failure
Symptom:
The vehicle is in anti-theft status. Use remote control to turn off anti-theft protection.
Reason analysis:
The system is in anti-theft state. Due to failure of remote control or system host (the host is basically failure of remote control receiving circuit), this causes theft protection failure to reset (the remote control loses control of system). Vehicle direction indicators (double jump lights) flash. The horn continues to beep. The vehicle cannot start moving. At this time, anti-theft system can only be removed temporarily. This requires user to pay attention to general installation position of anti-theft system host. Indicator lights, ultrasonic sensor probes or beeps and other components. Follow vines to find system host. Disconnect connector connecting anti-theft system. Host system to vehicle. In addition, some remotely controlled vehicle anti-theft system hosts have a kill switch feature. There is no need to dismantle host system. You can pause use of anti-theft device. 
Car remote control failure example 6
Symptom:
When you turn on turn signal on one side of car, other side also turns on.
Reason analysis:
This fault is due to a breakdown in anti-theft diode to control vehicle turn signal output voltage (double jumpers) (some models have these two diodes inside host, and some are connected to trunk) . Replace diode of same type to fix problem.