Mileage of about 26,000 km of the 2012 Toyota Highlander. Customers reflect: the vehicle suddenly unable to operate the remote control door lock with a key can only operate the left front door, called for a solution.
Troubleshooting: real vehicle inspection failure, check the remote control battery, any button on the remote CN900 Key Programmer control operation, the remote indicator shows normal, remote control functions and response functions do not work, the key can only operate the left front door, left front door central locking operation switch does not work. When the ignition switch is turned ON, the operation of the central locking switch, door locks work properly. Read diagnostic trouble codes are used B1242 (keyless entry tuner circuit fault). Causes may be: ① harness or connector; ② door control receiver; ③ main body ECU.
When the ignition switch is OFF, turn left front dome light does not shine (in door lights stop), instrument indicator light does not come on, also found that when the ignition switch from ON to OFF after the left front window main switch AUTO indicator flashes, except left front door windows have a delay function, the other three windows are no delay function, the ignition switch in the ON position function properly, but Found that the clock is not working, as long as the ignition switch ktag from ON to OFF and then to ON, the clock will start counting from 1, indicating no BAT clock only IG power supply.
According to the system schematics found, power windows, door locks clock and remote control systems have a common BAT power fuse 10AECU-BNO.1, suspected 10AECU-B NO.1 fuse problem. Examination revealed 10AECU-B NO.1 fuse, replace the new 10AECU-BNO. 1 fuse, commissioning, power windows, door locks, and remote clock
The control system work properly.
When completed delivery of the vehicle is ready, just open the left front door ready to get on the train, suddenly found the left front door sill installation of one cigarette after taking power windows, door locks clock and remote control system failure occurs again, 10A ECU-B NO .1 blown fuse again. Determine the cause of the failure was due to the odometer correction tool installation of an internal short circuit pedal welcome.
Check the installation of door sill line, found a welcome pedal lamp power cord to the power door control receiver DO-4-pin black line (Figure 1), Ground is gated by the light switch control, installation of welcome pedal harness smoky traces of overheating, disconnect the wiring harness connector, found traces of water erosion, nor do the wiring harness connector waterproof connector, so the judge is to add water welcome pedal harness internal corrosion short circuit, when the door opened, causing the power lines to ground through the short circuit caused by direct
Failure.
Fault Summary: This car is entirely due to failure of quality and methods of vehicles with obd2 scanenr quality problems. ① external electrical installation must pay attention to waterproof. ② try not to take the power to do the main function of the original car power. ③ Be sure to install a fuse in the proper installation of the electrical system load power output. Avoid the influence of the original car features and short circuit overload fire hazard.
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