how to fix the rear window not rolling down in my BMW 3 Series G20/G21 (2019-2024)

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

531 words

Problem Statement

The rear window in a BMW 3 Series G20/G21 (2019-2024) is not functioning and does not roll down when the window switch is activated.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent shorts or shocks.
•Allow time for the vehicle to cool if it has been recently operated.

Symptoms

•Rear window switch does not respond
•No sound of the window motor activating
•Possible blown fuse for the window circuit
•Intermittent operation of other windows
•Window lock feature may be engaged

Diagnostic Steps

1
Check the window lock switch to ensure it is not activated.
2
Inspect the rear window switch for signs of damage or wear.
3
Use a multimeter to check for power at the rear window motor connector.
4
Inspect the fuse box for blown fuses related to the power windows.
5
Test the rear window motor directly by applying 12V power to the motor terminals.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Remove any screws securing the door panel (typically located in the armrest and around the edges).
•Carefully use a trim removal tool to detach clips securing the door panel.

Parts Required

•Rear window motor (if found defective)
•Door panel clips (if broken during removal)

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Diagnostic Steps

1
Check the window lock switch to ensure it is not activated.
2
Inspect the rear window switch for signs of damage or wear.
3
Use a multimeter to check for power at the rear window motor connector.
4
Inspect the fuse box for blown fuses related to the power windows.
5
Test the rear window motor directly by applying 12V power to the motor terminals.

Solution

1. Preparation

Gather all necessary tools and replacement parts.
Disconnect the battery to ensure safety while working on the electrical system.

2. Remove Door Panel

Tools Required: Trim removal tool, socket set, screwdriver.
Remove any screws securing the door panel (typically located in the armrest and around the edges).
Carefully use a trim removal tool to detach clips securing the door panel.
Lift the door panel upwards to disengage it from the window channel and disconnect any wiring harnesses.

3. Inspect Window Motor and Mechanism

Locate the rear window motor and inspect for any visible damage or disconnection.
Check to see if the motor is securely mounted to the door frame.
If the motor appears damaged or non-functional, proceed to replace it.

4. Replace Window Motor (if necessary)

Tools Required: Socket set, torque wrench.
Disconnect the electrical harness from the window motor.
Remove the motor by unscrewing the mounting bolts.
Install the new motor and torque the bolts to manufacturer specifications (generally 7-10 Nm).
Reconnect the electrical harness to the new motor.

5. Reassemble Door Panel

Reattach any wiring harnesses that were disconnected.
Position the door panel back onto the door frame and ensure all clips engage properly.
Replace the screws to secure the door panel in place.

6. Reconnect Battery and Test

Reconnect the battery.
Test the rear window switch to ensure proper operation of the newly installed window motor.