Hello,

Last year, my windshield washer and headlamp washer systems were not working. I replaced the washer pump with an oem part, and replaced the headlamp washer pump with an identical Ford part from Ebay.

https://www.jaguarforums.com/forum/x...-start-236852/



The regular windshield washer jets work now, but I can’t get the headlamps to pump fluid. The motor turns on, and the spring loaded heads extend. However, fluid does not pump out.

The heads initially extend, extended slightly further, then retracted.

I disconnected the motor’s “send” line, and ran the system. It definitely shoots out pressurized water when it’s supposed to.

I connected a garden hose to the rubber headlamp hose, and it extended the washer heads under pressure and sprayed out water.

I also connected an air hose, and the heads extended.



I tried to pump air back through the heads to clear debris. After doing this, and operating the headlamp pump 20 plus times, nothing has changed.

I simply don’t know what to do. Could the replacement motor, which looks exactly like the oem part but is a generic Ford motor, not be powerful enough?

Could there be a kink or debris in the system?

What I don’t understand is why air will pump out to extend the washer heads, but no water will come out?

Any ideas appreciated. Thank you.

 

I have a video to post of the heads extending, though I am having some difficulty with that.

 

Sounds like the Ford pump doesn't produce the required pressure & you're going to have to bite the bullet & fork out for a Jaguar pump.

 

Yes, there's something about a built in resistance in the hose to the headlights, because otherwise the fluid would just trickle out. Maybe your Ford pump can't deliver?

 

If the jets extend and the cover flaps open, that can only happen if fluid is passing through since they are ONLY operated via the fluid pumped out. My system works perfectly but I intend to remove it in entirety as I never use it and would love to save more weight.

 

well the pump's a motor, and that therefore is the electrical system, so here's the obligatory "did you check the battery" post (i bet this isn't the problem).

so, is it possible rig up a simple dial to test how much pressure the motor is putting out in the line? if it's not too hard, any of us could repeat the test and report back.

 

"an identical Ford part from Ebay"

Identical? How identical? How much did you save? Maybe, just maybe, you wouldn't have a problem if you bought a Jag part, OEM or aftermarket.

Someone had to say it... Sorry

 

You have fluid and you have a "live" power feed so I think there may be a fault with the control circuit. This isn't a simple ON and OFF with the stalk button. Here's the description from the Workshop Manual:

The CJB monitors the operation of the wash/wipe switch and maintains a counter to restrict headlamp washer operation to every fourth operation of the wash/wipe switch in conjunction with a 10-minute timer. The timer prevents a second operation of the headlamp washers within a 10-minute period. Should the washer switch be activated for more than 4 programmed wipe requests during the 10-minute period, the headlamp washer will remain disabled. Only the next consecutive programmed wipe request, after the 10-minute timer has expired, will the headlamp washers be enabled. The counter and timer are reset when the ignition is set in the 'Off' mode or the light switch is turned from OFF back to ON within the same ignition cycle. When headlamp wash is active, the CJB energises the washer pump twice per cycle. The headlamp washer pump is powered for 2 x 800 ms periods.

JLR must have employed a passing Porsche engineer to dream up this over-managed lunacy. The extrordinarily complex control sequence of counter and timer could be at fault and effectively locking out the wash operation.

Testing is almost doomed to fail because it will invoke the timer/counter lockout!

The CJB monitors all inputs and outputs relative to the wiper system and other CJB controlled functions on the Local Interconnect Network (LIN) bus. If a fault is detected, a code applicable to that fault is stored.

If you have SDD, a DTC check may provide some insight into what is happening.

Graham

 

I replaced the new Ebay pump with the original, as a last ditch effort. The system works now.

I have no good explanation.

The two pumps look exactly the same. I bought the new pump as a troubleshooting step many months ago.

 

Strange, but glad it works...

 

That certainly redefines "troubleshooting".

Good to hear it's working.

Graham

 

Perhaps the tiny nozzles right at the outboard ends are blocked? Then the pump runs and produces pressure which pushes the nozzles out, but because water can't flow nothing actually comes out? Air is compressible, water is not.

 

I too have learned and heard that the oem solutions are typically the best. Glad it is now fixed for you.