why does my Tesla Model S Original (2012-2020) have a flickering dashboard light

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

518 words

Problem Statement

Learn how to diagnose and fix flickering dashboard lights in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shocks or shorts.
•Allow the car's systems to power down before performing any repairs to avoid electrical hazards.

Symptoms

•Dashboard lights flickering or pulsating
•Possible accompanying dimming of lights
•Occasional reset of the infotainment system
•Check battery warning or low voltage indicator may appear
•Inconsistent operation of other electrical components (e.g., headlights, interior lights)

Diagnostic Steps

1
Check for any software updates available for the vehicle via the Tesla app or touchscreen.
2
Inspect the vehicle’s 12V battery voltage using a multimeter to ensure it is within normal operating range (12.4V - 12.8V).
3
Examine the vehicle's main battery pack's health and state of charge using the Tesla diagnostics tool.
4
Review the vehicle's logs for any error codes related to electrical systems using the Tesla service menu.
5
Inspect the wiring connections and grounds associated with the dashboard lighting circuit for any signs of corrosion or loose connections.
6
Test the vehicle’s fuses related to the dashboard and lighting systems for any blown fuses.

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

•Multimeter
•OBD-II scanner (if needed)
•Basic hand tools (screwdriver set, socket set)

Parts Required

•New 12V battery (if testing shows it is weak)
•Electrical contact cleaner (if needed)

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Diagnostic Steps

1
Check for any software updates available for the vehicle via the Tesla app or touchscreen.
2
Inspect the vehicle’s 12V battery voltage using a multimeter to ensure it is within normal operating range (12.4V - 12.8V).
3
Examine the vehicle's main battery pack's health and state of charge using the Tesla diagnostics tool.
4
Review the vehicle's logs for any error codes related to electrical systems using the Tesla service menu.
5
Inspect the wiring connections and grounds associated with the dashboard lighting circuit for any signs of corrosion or loose connections.
6
Test the vehicle’s fuses related to the dashboard and lighting systems for any blown fuses.

Solution

1. Preparation

Tools Required: Multimeter, OBD-II scanner (if needed), basic hand tools (screwdriver set, socket set)
Disconnect the vehicle’s 12V battery to ensure safety while working on electrical components.

2. Check and Replace the 12V Battery

Locate the 12V battery (usually in the front trunk).
Use a multimeter to test the voltage; if below 12.4V, consider replacing.
Remove the battery terminals (negative first, then positive).
Unscrew and remove the old battery from its tray.
Install the new 12V battery, ensuring correct terminal connection (positive first, then negative).
Tighten terminals securely and close the battery compartment.

3. Inspect and Repair Wiring Connections

Check the wiring harness leading to the dashboard and lights for any signs of damage or wear.
Clean any corroded terminals or connectors using electrical contact cleaner.
Re-secure any loose connections and ensure all grounds are tight and free from corrosion.

4. Update Vehicle Software

Reconnect the 12V battery.
Access the vehicle's main touchscreen and navigate to the software update section.
Follow prompts to check and install any available updates.
Restart the vehicle after updates are applied.