Toyota Camry fail to start

        Mileage only 3300km 240V Toyota Camry sedan. Customer calls in the field, said the remote control does not work, you can not open the door, open the door with the mechanical key into the car, start with a mandatory approach also fail to start the vehicle. Functional checks when operating the remote control, door no action, with mechanical key chain car door into the car, when the brake pedal and start the ignition da-dongle j2534 switch on the indicator does not turn green. Determined to be caused by a vehicle anti-theft system is not lifted.
       Troubleshooting: First operation buttons on the remote control can not be unlocked, check the battery level is normal, there is 3.08V, when the operation buttons on the key indicator lights. Because security can not be lifted, the combination meter background light is not bright, it can not enter the system at this time IT2 read the fault codes. Technicians discovered during the operation of the vehicle at the time of vehicle anti-theft alarm is triggered, the hazard warning magic - no flicker, so there must be a preliminary determination anti-theft system fault. So first check the power supply circuit, the first of a main ECU power circuit to be checked, first check the relevant fuse, and focus on the ST / AM2, AM2, DOOR fuse inspection, but the examination was normal. ECU is the main technician doubt whether there is a fault, then replace a normal body ECU, but the replacement of faulty or not lifted. Then another of the same model car key and certification ECU fitted to a fault in the car, but according to the ignition switch instruments or background light is not lit, the point of failure or in the circuit control infer. A power supply circuit to be checked again. AM1 and AM2 technician maxidas 708 examination revealed no power on the main ECU (normally a battery powered directly for regular power supply), so the lines involving investigation, and finally found 7-pin connector EA1 on the loose, and then reassembling the normal test start the vehicle.
       Failure Summary: This car is the point of failure connector pins loose, causing the main ECU power without electricity. When solving these problems, we must first be good through the fault phenomenon accurately determine the fault direction, and take advantage of the circuit diagram, you can quickly find a breakthrough to solve the problem.
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