SL/R129: '99 SL500 windshield washer pump??
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 27
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From: Port St Lucie, FL
1999 SL500
'99 SL500 windshield washer pump??
Pressed the washer button this morning and nothing happened except the wiper cycled as normal when pressing the washer switch. When I metered the plug at the pump pin to pin I get 4.96v whether the washer switch is pressed or not. One pin to ground=4.96v, other pin to ground=0.07v. . I would guess the pump is a 12v pump, so this makes no sense to me. On the hot pin, I expected 0v with the switch not pressed and 12v with the washer switch depressed.
Any thoughts on where to look now?
Thanks,
Jimmy
Port St Lucie, FL
Any thoughts on where to look now?
Thanks,
Jimmy
Port St Lucie, FL
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 27
Likes: 0
From: Port St Lucie, FL
1999 SL500
Jimmy Dummy-Was metering the level sensor.OOPS!
Checked the parts manual. Might do better if I trouble shoot the pump rather than the level sensor. Oh well, I know what the voltage on the sensor is supposed to be.
Member
Joined: Jul 2010
Posts: 137
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From: Southern Illinois
82 380SL 96 SL500
I started troubleshooting my washer circuit when the washer didn't work, only to find that I hadn't noticed the wiper/washer switch needed to be pushed past a second detent for the washer to work. 
2001, 500, 99, benz, malfunction, mercedes, position, proper, pump, replace, replacement, sl, sl500, washer, windscreen, windshield
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