Why do the Wipers need a Temperature Sensor
#1
Why do the Wipers need a Temperature Sensor?
So I was working on my '90 XJS this weekend when I noticed an Ambient Air Temperature Sensor located on the panel in front of the radiators.
I thought that it must be part or the air conditioning system but when I looked at the wiring diagrams I found out that it is actually part of the windshield wiper system.
I cant imagine why the wiper system would need an ambient temp sensor. Did Jaguar decide to prevent operation of the wipers if the outside temperature is too cold or too hot?
I'm hoping someone here can explain the need for this sensor.
Thanks!
Mark
I thought that it must be part or the air conditioning system but when I looked at the wiring diagrams I found out that it is actually part of the windshield wiper system.
I cant imagine why the wiper system would need an ambient temp sensor. Did Jaguar decide to prevent operation of the wipers if the outside temperature is too cold or too hot?
I'm hoping someone here can explain the need for this sensor.
Thanks!
Mark
#2
At about this time, heated screenwasher jets were on some cars, and also heated outside rearview mirrors. So one explanation could, repeat could, be, that the loom included all the necessary wiring etc, whether this option was fitted or not.
I fitted a NoS wiper motor, and that has a wire for heating the screenwasher jets.
Greg
I fitted a NoS wiper motor, and that has a wire for heating the screenwasher jets.
Greg
#5
Safari,
I've often wondered if the diagram for the 1990/91 cars was actually wrong. Because looking at that diagram, you would conclude that the sensor was there to protect the wipers from operating when it was too cold / hot?
However, if you look at the diagrams of cars from earlier cars (1988- 1989) and then later cars (1992 onwards) it's clear that the ambient air sensor provides a signal only to the washer jets and headalmp washer jets.
Strange....
Paul
I've often wondered if the diagram for the 1990/91 cars was actually wrong. Because looking at that diagram, you would conclude that the sensor was there to protect the wipers from operating when it was too cold / hot?
However, if you look at the diagrams of cars from earlier cars (1988- 1989) and then later cars (1992 onwards) it's clear that the ambient air sensor provides a signal only to the washer jets and headalmp washer jets.
Strange....
Paul
#7
Safari,
I've often wondered if the diagram for the 1990/91 cars was actually wrong. Because looking at that diagram, you would conclude that the sensor was there to protect the wipers from operating when it was too cold / hot?
However, if you look at the diagrams of cars from earlier cars (1988- 1989) and then later cars (1992 onwards) it's clear that the ambient air sensor provides a signal only to the washer jets and headalmp washer jets.
Strange....
Paul
I've often wondered if the diagram for the 1990/91 cars was actually wrong. Because looking at that diagram, you would conclude that the sensor was there to protect the wipers from operating when it was too cold / hot?
However, if you look at the diagrams of cars from earlier cars (1988- 1989) and then later cars (1992 onwards) it's clear that the ambient air sensor provides a signal only to the washer jets and headalmp washer jets.
Strange....
Paul
I have never heard of a car that limits the wiper motor function based on air temperature but I have learned that with Jaguar anything is possible!
Mark
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#8
One day when I have time I will trace the wire and see if it actually goes to the wiper motor as indicated by the schematic.
I have never heard of a car that limits the wiper motor function based on air temperature but I have learned that with Jaguar anything is possible!
Mark
I have never heard of a car that limits the wiper motor function based on air temperature but I have learned that with Jaguar anything is possible!
Mark
#10
My car has no heated jets. The only heat they see come from the V12!
Mark
PS...Post #300!
Last edited by Safari; 04-27-2015 at 03:14 PM.
#11
Bc xj,
Tks, I see what you mean. It is a poor way to draw the direction to the earth terminal, which they drew in a more logical fashion in other years. Also, in this years diagram, they didn't actually label the washer heaters which they did in both the previous and subsequent years.
Clearly the 1990 wiring diagram technician got sacked after 1 year!
Paul
Tks, I see what you mean. It is a poor way to draw the direction to the earth terminal, which they drew in a more logical fashion in other years. Also, in this years diagram, they didn't actually label the washer heaters which they did in both the previous and subsequent years.
Clearly the 1990 wiring diagram technician got sacked after 1 year!
Paul
#12
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#16
After that its ready to upload to a message by clicking on the "Insert Image" icon at the top of the message window. Just browse to the file where the image is stored and click on the file. It will upload the image into the message.
Hope this helps.
Mark
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