how to fix the rearview mirror camera in my BMW 3 Series G20/G21 (2019-2024) that won't turn on?

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

566 words

Problem Statement

The rearview mirror camera in a BMW 3 Series G20/G21 (2019-2024) is not functioning and does not turn on, affecting the vehicle's visibility and safety features.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent short circuits.

Symptoms

•Rearview camera display is blank when engaged
•No image appears when the vehicle is in reverse
•Camera error message on the infotainment screen
•Unable to access camera settings in the vehicle menu
•Physical damage or moisture present in the camera housing

Diagnostic Steps

1
Check the vehicle's settings to ensure the rearview camera feature is enabled.
2
Inspect the camera lens for physical obstructions or damage.
3
Use an OBD-II scanner to check for any camera-related error codes.
4
Verify the camera's electrical connections by inspecting the wiring harness and connectors.
5
Test the camera's power supply using a multimeter to ensure it is receiving voltage.
6
Review any recent software updates or changes that may affect camera functionality.

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

•Disconnect the vehicle battery to ensure safety while working on electrical components.

Parts Required

•Replacement rearview camera (if needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the vehicle's settings to ensure the rearview camera feature is enabled.
2
Inspect the camera lens for physical obstructions or damage.
3
Use an OBD-II scanner to check for any camera-related error codes.
4
Verify the camera's electrical connections by inspecting the wiring harness and connectors.
5
Test the camera's power supply using a multimeter to ensure it is receiving voltage.
6
Review any recent software updates or changes that may affect camera functionality.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, screwdriver set, cleaning supplies, and a protective cover for the interior.
Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Inspect and Clean the Camera

Sub-steps:
- Remove the rearview mirror assembly carefully using a screwdriver.
- Detach the camera housing from the rearview mirror.
- Clean the camera lens with a microfiber cloth and appropriate lens cleaner to remove any dirt or debris.
- Check for any moisture in the camera housing; if present, allow it to dry completely.

3. Check Electrical Connections

Sub-steps:
- Inspect the wiring harness connected to the rearview camera for any signs of damage or corrosion.
- Use a multimeter to test for voltage at the camera connector while the vehicle is in reverse. Voltage should be present (typically 12V).
- If no voltage is detected, trace the wiring back to the main harness to find potential breaks or shorts.

4. Replace the Camera (if necessary)

Sub-steps:
- If the camera is faulty, procure a replacement camera specific to the BMW 3 Series G20/G21.
- Install the new camera by reversing the disassembly steps: connect the wiring harness, secure the camera into the housing, and reattach the rearview mirror assembly.
- Reconnect the vehicle battery.

5. Final Check

Sub-steps:
- Turn on the vehicle and engage the reverse gear to check if the camera activates correctly.
- Monitor the infotainment system for any error messages related to the camera.