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Headlight washers
I have a 96 SE7 and the headlamp jets don't want to work for me. I stood by the reservoir while my son activated the washers with the headlights on. The middle pump on the tank comes on after about 1 sec delay, runs for 1 sec and then cuts out. Everything else on the truck works great with the exception of cruise control. Is it possible the middle pump is dead or is there a relay or something else I can check? If the pump is dead can you replace just the pump or are theses built into the washer reservoir?
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i am also curious since this is 1 of 2 thing not working for me though i did clear mine by blowing air through the line while the bumper was off so I can eliminate that as a problem
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I plugged mine up since the plastic jets were broken anyway. I still have yet to pull the washer fluid tank out to fix the leak. :/
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2 Attachment(s)
zigzag3141 - when the pump ran, did it squirt? If not, there is a "T" valve on the fluid line between the washers where the pump connects, it is a "anti-drain back" valve. Could be stopped up. Pump is also replacable. See attached pages from your copy of the RAVE workshop manual. You should be able to remove hose from pump and blow air thru it, the T valve, and out the washer stubs. You can also run the pump without hose attached to see if it squirts, maybe even poke around the grille (oops - front bumper) and find the T valve.
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The t-valve is easier to get to from under the front bumper...
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The front headlight jets don't work even when the center pump activates briefly. I pulled the hose at the pump and there is no change in pressure even when it turns on. I'm willing to bet the pump is dead so I'm gonna replace that first and then I'll let you all know.
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So I finally got a different tank, plugged it in, and it does the same thing. With the headlights on, when you activate the windscreen washer, the center pump comes on after a brief delay and then quickly cuts out. Are the headlight washers designed this way i.e. to pulse once briefly? My headlamp washer still do not work however if all you get is a pulse I can imagine it will take a long time to prime the hose. Maybe it will start working someday...
If someone reads this who has a D1 with working headlamp washer can you please let me know how yours work? |
On a D1:
The headlamp washers operate automatically whenever the windscreen washers are operated, provided the headlamps are illuminated and switched to dipped beam. For continuous washing, hold the windscreen washer control in the washposition E. On a D2 - Operating the front washer switch with the headlamps switched on energises the IDM, supplying a voltage to the headlamp powerwash relay, which operates the headlamp powerwash pump and increments a counter within the BCU. This counter prevents the headlamp powerwash pump from operating every time the front washer switch is activated. Headlamp powerwash is only operational every third front wash cycle, providing the headlamps are on. The counter resets when the ignition switch is turned off. When the BCU permits headlamp power wash operation, the pump motor operates only for 0.5 second. |
and...
Headlamp power wash energised for half a second That blurb from the electrical guide, for the multifunction unit. This is a timer module in a white box on the back of the main fuse panel under dash. It controls a variety of timing duties, like dome lights dimming, rear wiper, etc. The box can fail and take one or more functions with it. I think it "grew" into the BCU of the D2. Here is test for the module: Diagnostic Procedure 1. Close all doors and the tailgate. NOTE: If the oil pressure switch goes open circuit (engine is started) during the following procedure, the MFU will exit the diagnostic mode immediately. 2. Press and hold the heated rear screen switch and switch on the ignition. 3. Release the heated rear screen switch within 2 seconds and the MFU will beep to indicate that it’s in diagnostic mode 1. 4. Press the heated rear screen switch; the MFU will beep twice. In turn, operate each of the following switches, heated front screen, rear fog guard lamps, side lights, headlights, front wiper and rear wiper. The MFU will beep twice each time a switch is operated. 5. Pressing the heated rear screen again will cause the MFU to enter diagnostic mode 2. 6. The MFU will provide outputs to the following in order given below: Heated rear screen relay energised for 2 seconds Heated front screen energised for 2 seconds Courtesy lights energised for 2 seconds Dim dip relay energised for 2 seconds Rear fog guard lamp energised for 2 seconds Headlamp power wash energised for half a second Front wiper energised for half a second Rear wipe/wash energised for half a second 7. The MFU will then exit the diagnostic mode. |
changed my pump still the 2 second burst
ran the test procedure for mfu and second time around they started working now I hit the sprayer and they spray ( with low beam on) for 2 seconds think that's all they are supposed to do on each pull, right? looks like high pressure coming out one less thing to fix yeaaah :D |
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