Not again, an orange warning light
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Senior Member
Joined: Sep 2018
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From: Dayton ohio
Not again, an orange warning light
Some months ago I got the dreaded Parking brake defective warning on the dash. Wow a big one. Must be bad. Brake worked correctly.
The car needed its yearly oil change anyway.
After 2 weeks at the dealer it was fixed. No problem with the brakes. The body computer was faulty. Only $2200.
Now I have the washer fluid low symbol on the dash.
So I filled the tank. Well not really. Only took about 8 ounces.
But, the light did not go off. Gag! Another $2200 and two weeks in the shop?
So I did nothing for several days Ignored the light. The washer worked well.
Apparently the Jaguar fairy came along and fixed it. Light went out.
Or the real question. Does it just take this long to get the message to the computer. Or is this how the washer system is?
The car needed its yearly oil change anyway.
After 2 weeks at the dealer it was fixed. No problem with the brakes. The body computer was faulty. Only $2200.
Now I have the washer fluid low symbol on the dash.
So I filled the tank. Well not really. Only took about 8 ounces.
But, the light did not go off. Gag! Another $2200 and two weeks in the shop?
So I did nothing for several days Ignored the light. The washer worked well.
Apparently the Jaguar fairy came along and fixed it. Light went out.
Or the real question. Does it just take this long to get the message to the computer. Or is this how the washer system is?
Last edited by Tomkatb; Jun 28, 2025 at 02:58 PM.
Joined: Feb 2014
Posts: 20,531
Likes: 15,306
From: Crossroads of America
Hi Tomkatb,
You don't tell us the year and model of your Jaguar, but the most common cause of your symptoms in most Jaguars is a stuck washer fluid level sensor float, or a problem with the wiring to the sensor.
Cheers,
Don
You don't tell us the year and model of your Jaguar, but the most common cause of your symptoms in most Jaguars is a stuck washer fluid level sensor float, or a problem with the wiring to the sensor.
Cheers,
Don
Senior Member
Joined: Jul 2022
Posts: 224
Likes: 51
Some months ago I got the dreaded Parking brake defective warning on the dash. Wow a big one. Must be bad. Brake worked correctly.
The car needed its yearly oil change anyway.
After 2 weeks at the dealer it was fixed. No problem with the brakes. The body computer was faulty. Only $2200.
Now I have the washer fluid low symbol on the dash.
So I filled the tank. Well not really. Only took about 8 ounces.
But, the light did not go off. Gag! Another $2200 and two weeks in the shop?
So I did nothing for several days Ignored the light. The washer worked well.
Apparently the Jaguar fairy came along and fixed it. Light went out.
Or the real question. Does it just take this long to get the message to the computer. Or is this how the washer system is?
The car needed its yearly oil change anyway.
After 2 weeks at the dealer it was fixed. No problem with the brakes. The body computer was faulty. Only $2200.
Now I have the washer fluid low symbol on the dash.
So I filled the tank. Well not really. Only took about 8 ounces.
But, the light did not go off. Gag! Another $2200 and two weeks in the shop?
So I did nothing for several days Ignored the light. The washer worked well.
Apparently the Jaguar fairy came along and fixed it. Light went out.
Or the real question. Does it just take this long to get the message to the computer. Or is this how the washer system is?
Veteran Member
Joined: May 2013
Posts: 7,024
Likes: 2,694
From: Metrowest Boston
Yes, the main tank is in back where you filled it. It’s then pumped to a smaller tank, which I think is behind the front right wheel, somewhere in there. From there it goes to the windshield washers, and sometimes, the headlight sprays. So there should be a sensor in the front tank, to tell the pump when to refill it, and one in the rear to activate the low fluid warning light.
Good info starts on p. 2549 of the repair manual…
https://www.dropbox.com/scl/fi/o6d1x...=43w5j80g&dl=0
Good info starts on p. 2549 of the repair manual…
https://www.dropbox.com/scl/fi/o6d1x...=43w5j80g&dl=0
The wiper and washer system comprises:
- A windshield wiper motor
- A windshield wiper linkage
- Two windshield wiper arms and blades
- Two windshield washer jets
- Two headlamp washer jets
- The front windshield washer fluid reservoir
- The windshield washer pump, a headlamp washer pump and the washer fluid level sensor
- The rear windshield washer fluid reservoir with a transfer pump and a fluid level sensor
- The wipers and washers control switch
- The rain/light sensor
Last edited by DJS; Jun 29, 2025 at 02:30 PM.
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From: Metrowest Boston
WASHER FLUID LEVEL SENSORS
The washer fluid level sensors have a float with integral magnet. Each sensor has a contact, which is normally open when the windshield washer reservoir is full. When the washer fluid level reduces to approximately 1 liter, the magnetic float pivots down, and close the switch contacts. This closed circuit is sensed by the CJB, which controls the rear washer fluid transfer pump relay located in the EJB. The washer fluid transfer pump will transfer the washer fluid, until the front windshield washer reservoir level sensor sends a signal to the CJB that the front reservoir is full.
The fluid transfer takes approximately 10 seconds, if the pump is still running after 15 seconds it will be disabled for 10 minutes to protect the pump. This timer is reset following an ignition cycle.
The CJB monitors the washer fluid level sensors continuously. The CJB checks the rear washer fluid level sensor when the ignition is switched on to give the driver an early warning of the low fluid level. The CJB then monitors the sensor value over a 25 second period when the ignition is on to prevent invalid messages due to fluid 'sloshing' in the windshield washer reservoir. When the washer fluid level is low, the CJB sends a message to the GWM (Gateway Module) via the MS (Medium Speed) CAN (Controller Area Network) body systems bus. The GWM then transmits the message to the IC (Instrument Cluster) via the MS CAN comfort systems bus, then the 'WASHER FLUID LOW' message is displayed in the IC message center.
The washer fluid level sensors have a float with integral magnet. Each sensor has a contact, which is normally open when the windshield washer reservoir is full. When the washer fluid level reduces to approximately 1 liter, the magnetic float pivots down, and close the switch contacts. This closed circuit is sensed by the CJB, which controls the rear washer fluid transfer pump relay located in the EJB. The washer fluid transfer pump will transfer the washer fluid, until the front windshield washer reservoir level sensor sends a signal to the CJB that the front reservoir is full.
The fluid transfer takes approximately 10 seconds, if the pump is still running after 15 seconds it will be disabled for 10 minutes to protect the pump. This timer is reset following an ignition cycle.
The CJB monitors the washer fluid level sensors continuously. The CJB checks the rear washer fluid level sensor when the ignition is switched on to give the driver an early warning of the low fluid level. The CJB then monitors the sensor value over a 25 second period when the ignition is on to prevent invalid messages due to fluid 'sloshing' in the windshield washer reservoir. When the washer fluid level is low, the CJB sends a message to the GWM (Gateway Module) via the MS (Medium Speed) CAN (Controller Area Network) body systems bus. The GWM then transmits the message to the IC (Instrument Cluster) via the MS CAN comfort systems bus, then the 'WASHER FLUID LOW' message is displayed in the IC message center.
Last edited by DJS; Jun 29, 2025 at 02:37 PM.
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Senior Member
Joined: Sep 2018
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From: Dayton ohio
current overnight voltage is 12.6 volts. For this brand the company says 12.6 to 12.8 is fully charged.
The car sat idle for the month of March. Not driven a lot since then.
Added about 8 oz of fluid today.
The car sat idle for the month of March. Not driven a lot since then.
Added about 8 oz of fluid today.
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