Supra JZA80 How To Improve Keyless Entry System Reception Sensitivity

The time when Toyota Supra JZA80 made its debut was just the time to shift from the infrared type keyless entry system to the radio type. The infrared type directs the infrared wave by directing the key to the door key cylinder. Sensitivity is poor and will not respond unless it is very close. A typical example is Subaru Legacy BG5 and so on. Toyota cars around 1992 have mostly adopted the radio wave type.

The keyless receiver, which is a dealer-installed option, is equipped as such a box under the driver’s seat.

Open the tabs of the receiver little by little using a flat head screwdriver.

Lift the other side of the connector and remove the black case cover, avoiding the blue connector.

The circuit board comes out. While you’re at it, it might be good to check for electrolyte leaks. The operation time is short, so I think it’s OK.

Below the big coil, there is a part where “ANT” is printed on the circuit board. Solder appropriate wiring here. The length should be about 1 to 1.5 meters.

Even if you turn this variable resistor, it will change, but it will change just a little, so you can ignore it.

If you solder the wiring to “ANT”, you can get the wiring from this service hole.

Be sure to insulate the tip of the wiring. Then this wiring is laid along the B pillar or along the A pillar, the sensitivity will be significantly improved. it’s done.

The reason why this type of keyless has poor sensitivity lies in the Japanese Radio Law. By this law, it is set with a considerable margin. Explained the processing of the receiver here, but if the sensitivity of the keyless is not yet good enough, the remaining option will be the processing on the key side.