![]() ![]() Hopefully this gives you the info that you need. If you have power everywhere, but still no sounder, then this would be either a bad sounder or a bad wire between the computer and the sounder (measure for the power going to the sounder at the computer and at the plug to the sounder, if you have a significant difference in voltage, then you have a bad wire). If you have power 12 VDC power, back up lighting power, and power to the sensors, but no power to the sounder (with something close to the vehicle), then you have a bad computer, just on the output side of it. So, in short, if you have 12 VDC power and you have 12 VDC backup lighting power, but you don't have any voltage to the sensors, then you have a bad computer. The green/black wire is what tells the parking aide computer to start pulsing the reversing sensors to have them start making noise. This should have 12 VDC on it whenever the car is in reverse. The other wire would be the back up lighting wire (Green/Black). This should have 12 VDC on it at all times. These would be the power wire (yellow/green wire). From the sounds of things, this wire wouldn't be telling you much any ways.īased on what you are seeing, I would also check 2 other wires to chassis ground. This can be a number of voltages and odds are will not be significant enough for you to measure. But, all 4 sensors should be getting roughly the same voltage.Īs for the voltage on the remaining wire at the sensors (Pin 2). If you are getting 12 VDC there, then that would be an issue. ![]() So, if you are seeing any voltage there when the car is in reverse, then you can assume the computer is trying to tell the sensors to do their job. YOu may only see say 5 VDC if you are using a digital meter or a voltage that is bouncing around a lot as this voltage is turning on and off fairly quickly to allow the noise the sensor makes to be transmitted, bounced off an object and then sensed. This would be seen on the Red/White (+) and Black/Green (-) wires at the sensors. Since you are not getting any sound from the sensors, my next check would be to measure for "12 VDC" going to the sensors. So, if you are not getting 12 VDC to the sounder, then you are not getting the signals processed by the computer. The speaker is simply a piezo speaker that takes a 12 VDC signal and creates a tone when power is applied (different from a normal speaker which requires an AC signal for it to make any significant noise). Thomas, the 2 wires going to the parking aide speaker (sounder), you should be seeing that either a solid 12 VDC or bouncing between 12 VDC and 0 VDC depending on how far away something is to the back of the car. Please register or login to enable Dark Mode.Forum announcement archives / Forum History.PRIVATE For Sale / Trade or Buy Classifieds.Other Jaguar Models / Concepts / Replicas.S-Type / S type R Supercharged V8 ( X200 ).Jaguar Forums Feedback & Suggestion Center. ![]()
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