How to troubleshoot the faulty power window issue in my Mercedes-Benz E-Class W213 (2016-2024)?

Troubleshooting Faulty Power Window Issue in Mercedes-Benz E-Class W213 (2016-2024)

Symptoms

1. Power window does not operate at all.
2. Window does not respond to driver’s control but may respond to passenger’s control.
3. Window moves slowly or makes unusual noises.
4. Window operates intermittently.

Diagnostic Steps

Step 1: Initial Inspection

• Tools Required: Visual inspection tools (flashlight), multimeter
• Action: Check for any visible damage to the window switch, wiring harness, and window motor. Look for signs of wear, corrosion, or disconnection.

Step 2: Check the Window Switch

• Tools Required: Multimeter
• Action:
  1. Remove the door panel to access the window switch.
  2. Disconnect the window switch connector.
  3. Use a multimeter to check for voltage:
     • Set the multimeter to the DC voltage setting.
     • Probe the connector terminals while operating the switch. You should see a voltage reading (typically around 12V) when the switch is pressed.
  4. If there is no voltage, the switch may be faulty.

Step 3: Inspect the Window Motor

• Tools Required: Multimeter, screwdriver set
• Action:
  1. If the switch is functioning, check the window motor.
  2. Remove the door panel to access the motor.
  3. Disconnect the motor connector.
  4. Using a multimeter, test for voltage at the motor connector while operating the switch.
  5. If there is voltage but the motor does not operate, the motor is likely faulty and needs replacement.

Step 4: Check the Window Regulator

• Tools Required: Torque wrench, pliers
• Action:
  1. If the motor works but the window does not move, inspect the window regulator.
  2. Remove the window motor and visually inspect the regulator for damage or obstruction.
  3. Manually operate the regulator to check for binding or stiffness.

Step 5: Inspect Fuses and Relays

• Tools Required: Fuse puller, multimeter
• Action:
  1. Locate the fuse and relay box (usually found in the engine compartment or under the dashboard).
  2. Check the fuse associated with the power windows. Replace if blown.
  3. Test the relay by swapping it with a similar one in the box.

Repair Instructions

Step 1: Replacing the Window Switch

1. If the switch is determined to be faulty, purchase a replacement switch specific to your Mercedes-Benz E-Class W213.
2. Reconnect the new switch to the connector and test functionality before reassembling the door panel.
3. If it works, reattach the door panel securely.

Step 2: Replacing the Window Motor

1. If the window motor is faulty, order a new motor compatible with your model.
2. Disconnect the battery to ensure safety.
3. Remove the door panel and access the motor.
4. Disconnect the motor wiring and remove the mounting screws.
5. Install the new motor by reversing the disassembly steps and ensuring all connections are secure.
6. Reconnect the battery and test the window function before replacing the door panel.

Step 3: Replacing the Window Regulator

1. If the regulator is damaged, order a suitable replacement.
2. Disconnect the battery for safety.
3. Remove the window from the regulator (may require special tools for some models).
4. Unscrew the regulator from the door frame and disconnect any wiring.
5. Install the new regulator by following the reverse order of disassembly.
6. Reinstall the window and ensure it operates smoothly.
7. Reconnect the battery and test the entire system.

Final Steps

• After completing repairs, reassemble the door panel securely, ensuring all clips and screws are in place.
• Test all window functions from both driver and passenger sides to confirm that the issue is resolved.
• Clean up the work area and dispose of any old parts responsibly.

By following these steps, you should be able to effectively troubleshoot and resolve the power window issue in your Mercedes-Benz E-Class W213.