Question about 1987 Mercedes-Benz Mercedes Benz 400 Class

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Window regulators and related electicial system

I have a 1979 450SL Mercedes with a electrial problem. Both electric windows quit working at the same time. I checked the fuses, #3 #4 both are good, but I don't seem to have power to the swithes , any suggestions

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Of course the first thought would be the fuse so you might check it one more time. After that the one thing both side have in coman is the driver side as you can roll the pass side up and down from there. So you may have a broken wire or curcit on that side, maybe the power wire is broken in the rubber boot that conects the door to the car on that side. A simple test light would help track it down.

Posted on Feb 21, 2009

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Posted on Jan 02, 2017

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All power windows/sunroof quit working at the same time. Where is the fuse box? Exactly which # fuse do I look to replace? 2000 Ford Eddie Bauer Expedition. Also a/c is not cold, has been charged and...


Inspection and Verification
  1. The power windows system is a generic electronic module (GEM) controlled system.
  1. Verify the customer concern by operating the power window system.
  1. Visually inspect for obvious signs of mechanical and electrical damage; refer to the following chart:


Visual Inspection Chart Mechanical Electrical
  • Window regulator electric drive
  • Window glass
  • Vent window motor
  • Central junction box (CJB) Fuse:
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    • 8 (5A)
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    • 17 (10A)
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    • 20 (5A)
  • Battery junction box (BJB) Fuse:
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  • Relay(s)
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  • Window regulator electric drive
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  1. If the concern remains after the inspection connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  1. If the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
  1. Carry out the DATA LINK DIAGNOSTIC TEST. If the scan tool responds with:
    • CKT 914, CKT 915 or CKT 70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00 .
    • NO RESP/NOT EQUIP for the GEM, Go To Pinpoint Test A .
    • SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the GEM.
  1. If the DTCs retrieved are related to the concern, go to the GEM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
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This is a common problem, but I've never seen a window regulator go bad in a Mercedes, the problem is probably the switch, you can check his by removing both working and nonworking window switches from the console, and plug in the other side or rear to roll the windows up/down,you will need to disassemble the switch that does not work and clean it well then, it will work again I've done it to my Mercedes

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All windows in my ml320 STOPED WORKING AT THE SAME TIME. cOULD IT BE A FUSE?


Yup, or a relay, or a solenoid. It could also be the switch. Have you tried each window at it's own door switch, or just tried the driver's switch that has all 4 window buttons? If the other ones work, but not the driver's switch, it's a wiring issue related to the driver's switch. If None of them work anywhere, have a repair facility or dealership perform electrical diagnosis (they'll be checking powers and grounds along the wiring, from the switches, to see where the issue is after checking your fuses and circuit breakers or any pertinent relays or solenoids).

Please note: All four window motors/regulators/switches failing at once is extremely hard to believe. If the vehicle was hit by lightning, maybe, I could see that happening, but if it hasn't been struck by lightning, don't let anyone sell you multiple motors/regulators or switches.

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for a easy to understand photo session on this service please visit our website
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