You will most likely find that the widow regulator is faulty and needs replacing or the limit switch inside the door is faulty and will need to be replaced. I had the same problem on a 1993 500SEL on 2 rear windows but 2 new regulators and drilling out the limit switch rivets and replacing them with new switches sorted out the problem
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Passenger door module (PDM)
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Body control module (BCM)
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LR power window switch
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RR power window switch
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Window up and window down relays in each of the rear passenger window switches
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Window lockout switch
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Reversible power window motors in each of the doors (circuit breaker protected)
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LT DOOR CB 25A (System power for left rear window)
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RT DOOR CB 25A (System power for right rear window)
The power window system will operate anytime the retained accessory power (RAP) system is active or when the ignition switch is in the ACCY or ON position.
The DDM contains 4 power window switches which are integral components. Closing any of the normally open, rocker type switches provides the DDM with a request for power window operation. The switches for the 2 front windows have 3 positions Up, Down and Express Down, while the switches for the rear windows have only 2 positions, Up and Down. Each of these switches and their positions is a direct input into the DDM. Upon receiving a request for power window operation, the DDM, transmits a class 2 message indicating the switch and it's changed position.
The PDM contains a single power window switch that is an integral component. Closing of this normally open, rocker switch provides the PDM with a request for the front passenger power window operation. The switch for the front passenger window has 2 positions Up and Down. Each of these switch positions is a direct input to the PDM.
The 2 rear passenger doors have there own switches. Each of the switches contain a power window up and down relay. A switch activation alone can control the up and down functions of the rear windows. However the BCM, upon receiving a class 2 message from the DDM, can control the set of relays which will activate the rear window motors.
Check
Window fuse's and relay's may be up under driver or passenger side dash or behind glove box, under the hood and even under the seats, and finally on the ends of the dash. All passenger power windows and locks are controlled thru and get power from the master control switch on the drivers door.
Drivers door window gets used the most so it could be the motor, window switch, relay or fuse.
Could also be a broken wire in the rubber boot going from the door to the body. You will have to eliminate each till you find the culprit. Check that all switches return to neutral when released.
The motor and the relay are the most likely to cause this problem. Try swapping the relay with a working window relay. If it still doesn't work, remove the door panel and remove the window motor.
Turn the motor shaft in both directions by hand several turns. Then plug the motor in and see if the switch will now run the motor. Sometimes that's all it takes to get it working again. I have had to do this with brand new motors. If voltage is not present at the motor connector, either a bad switch or a broken wire exists. Make sure to check for voltage coming to that windows switch. Actually, GM use's a circuit breaker type relay for each window and one fuse for all the circuit breakers.
Try this....
Open the door, turn the key to the ON position without starting the engine and everything that makes noise is off. Lean down placing your ears close to the bottom center of the door or at the speaker grill. Press the window switch UP and DOWN. Listen for the window motor. If heard the drive is damaged. If not heard, turn key off and locate and replace the relay with one of the other window relays. Check window again. If it works now, get a new relay. More often than not, removing the motor and turning it by hand will get it working good as new. I have had to do that with Brand New motors! So try it.
If all has failed, with the door panel still off, check for voltage at the motor connector when pushing the window switch. No voltage means its the switch, especially if its a auto down or up switch.
Window fuse's and relay's may be up under driver or passenger side dash or behind glove box, under the hood and even under the seats, and finally on the ends of the dash. All passenger power windows are controlled thru and get power from the master control switch on the drivers door.
Drivers door window gets used the most so it could be the motor, window switch, relay or fuse.
Could also be a broken wire in the rubber boot going from the door to the body. You will have to eliminate each till you find the culprit. Check that all switches return to neutral when released.
The motor and the relay are the most likely to cause this problem. Try swapping the relay with a working window relay. If it still doesn't work, remove the door panel and remove the window motor.
Turn the motor shaft in both directions by hand several turns. Then plug the motor in and see if the switch will now run the motor. Sometimes that's all it takes to get it working again. I have had to do this with brand new motors. If voltage is not present at the motor connector, either a bad switch or a broken wire exists. Make sure to check for voltage coming to that windows switch. Actually, GM use's a circuit breaker type relay for each window and one fuse for all the circuit breakers.
Try this....
Open the door, turn the key to the ON position without starting the engine and everything that makes noise is off. Lean down placing your ears close to the bottom center of the door or at the speaker grill. Press the window switch UP and DOWN. Listen for the window motor. If heard the drive is damaged. If not heard, turn key off and locate and replace the relay with one of the other window relays. Check window again. If it works now, get a new relay. More often than not, removing the motor and turning it by hand will get it working good as new. I have had to do that with Brand New motors! So try it.
If all has failed, with the door panel still off, check for voltage at the motor connector when pushing the window switch. No voltage means its the switch, especially if its a auto down or up switch.
You may also find that the connector has simply come loose from the master window control. Good luck!!
There are two fuse boxes. A baqttery junction box under the hood on the drivers side and one inside on drivers side. Good luck.
Fuse/Relay
Location
Fuse Amp
Rating
Power Distribution Box
Description
1 60A** I/P Fuse Panel
2 40A** Blower Motor Relay
3 50A** 4 Wheel Anti-Lock Brake System
(4WABS) Module
4 30A** Power Windows, Power Moon
Roof, Power Seat
5 50A** Ignition Switch, Starter Relay
6 20A** Transfer Case Relay
7 - Not Used
8 20A** Air Suspension
9 40A** Air Suspension
10 30A** PCM Power Relay
1 10A* A/C Relay
2 30A* Heated Seats
3 30A* Heated Backlight
4 15A* Fog Lamps and Daytime Running
Lamps
5 4 3 2 1
10 9 8 7 6
12 11 10 9
8 7 6 5
4 3 2 1
15 14 13
2 1 1
9
6
10
8
7
5
4
1
3 2
175
MEGAFUSE
Roadside emergencies
197
Fuse/Relay
Location
Fuse Amp
Rating
Power Distribution Box
Description
5 - Not Used
6 10A* Powertrain Control Module
7 30A* 4 Wheel Anti-Lock System
(4WABS) Module
8 15A* Rear Wiper Motor
9 20A* Fuel Pump Relay and RAP
Module
10 15A* Horn Relay
11 15A* Parklamps Relay and Mainlight
Switch
12 30A* Mainlight Switch and
Multifunction Switch
13 15A* Heated Oxygen Sensor, EGR
Vacuum Regulator, EVR Solenoid,
Camshaft Position (CMP) Sensor,
Canister Vent Solenoid
14 30A* Generator/Voltage Regulator
15 - Not Used
1 - Wiper Park Relay
2 - A/C Relay
3 - Wiper High/Low Relay
4 - PCM Power Relay
5 - Fuel Pump Relay
6 - Starter Relay
7 - Horn Relay
8 - Rear Wipe Down Relay
9 - Blower Motor Relay
10 - Rear Wipe Up Relay
1 - Not Used
1 - DRL Diode
2 - Electronic Engine Controls Diode
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I COULD NOT FIND ANY STOP SWITCHES ANYWHERE IN THE DOOR.IF ITS THERE I CANT FIND IT.THIS IS A 92 400E. I FOUND A BROKEN GUIDE, BUT THERE IS NOTHING IT COULD COME IN CONTACT WITH (I.E. SWITCH ETC.)I CANNOT FIND ANYONE WHO KNOWS WHAT THE BOX UNDER THE REAR SEAT IS CALLED,THE ONE WITH ALL THE RELAYS IN IT.
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