how to troubleshoot Tesla Model Y Current (2020-present) no power to the rear lights

Tesla Model Y Current (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

536 words

Problem Statement

Learn how to troubleshoot and fix the no power issue to the rear lights on Tesla Model Y (2020-present). Step-by-step guide with diagnostic procedures.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle's 12V battery before working on electrical components to prevent shock or short circuits.

Symptoms

•Rear lights do not illuminate
•Brake lights are non-functional
•No turn signal operation at the rear
•Rear light bulb warning message on the dashboard
•Possible blown fuses related to the rear lights

Diagnostic Steps

1
Inspect the rear light bulbs for any visible signs of damage or burnout.
2
Check the fuse box for any blown fuses related to the rear lighting circuit.
3
Use an OBD-II scanner to check for any fault codes related to the lighting system.
4
Verify the wiring harness connections at the rear lights for any loose or corroded connections.
5
Measure voltage at the rear light connectors using a multimeter to confirm power supply.

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

•OBD-II scanner
•Multimeter
•Fuse puller
•Basic hand tools (screwdriver, socket set)

Parts Required

•Replacement light bulbs
•Replacement fuses (if necessary)

Related Faults

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Diagnostic Steps

1
Inspect the rear light bulbs for any visible signs of damage or burnout.
2
Check the fuse box for any blown fuses related to the rear lighting circuit.
3
Use an OBD-II scanner to check for any fault codes related to the lighting system.
4
Verify the wiring harness connections at the rear lights for any loose or corroded connections.
5
Measure voltage at the rear light connectors using a multimeter to confirm power supply.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, fuse puller, basic hand tools (screwdriver, socket set).
Disconnect the vehicle's 12V battery to prevent electrical shock.

2. Inspect and Replace Bulbs

Sub-steps:
1. Remove the rear light assembly by unscrewing any fasteners and gently pulling it away from the vehicle.
2. Inspect the light bulbs; if any are burnt out, replace them with new bulbs of the correct specification.
3. Reinstall the light assembly securely and reconnect any electrical connectors.

3. Check and Replace Fuses

Sub-steps:
1. Locate the fuse box, typically found under the dashboard or in the trunk area.
2. Identify the fuse responsible for the rear lights using the fuse diagram.
3. Use a fuse puller to remove the fuse and check for continuity; replace it if blown.
4. Reinstall the fuse and ensure it is securely seated.

4. Diagnose Wiring Issues

Sub-steps:
1. Inspect the wiring harness leading to the rear lights for any signs of wear or corrosion.
2. If damaged, repair the wiring using appropriate electrical connectors and tape.
3. Ensure all connections are tight and free of corrosion.

5. Confirm Power Supply

Sub-steps:
1. With the multimeter, set it to measure voltage.
2. Probe the rear light connector terminals while having someone press the brake pedal or activate the turn signal.
3. Confirm that voltage is present when the lights are activated. If not, trace back to the fuse and power supply.