Hello,
ALL the sensors have to be working fine for the system to work,
a single bad sensor renders the whole system useless.
some times, once you fix a particular sensor, you wake the devil in the rest of them.
A very easy way to check them is by pulse method.
Start the car, now place your finger ever so gently on the sensor.
You should be able to feel a slight pulse / tick sensation, which tells you that the sensor is fine.
You will have to engage the reverse gear to do the same with the rear sensors.
Once you check all the sensors to be fine, then suspicion moves to wiring and the PTS controller.
ALL the sensors have to be working fine for the system to work,
a single bad sensor renders the whole system useless.
some times, once you fix a particular sensor, you wake the devil in the rest of them.
A very easy way to check them is by pulse method.
Start the car, now place your finger ever so gently on the sensor.
You should be able to feel a slight pulse / tick sensation, which tells you that the sensor is fine.
You will have to engage the reverse gear to do the same with the rear sensors.
Once you check all the sensors to be fine, then suspicion moves to wiring and the PTS controller.