how to fix the rear seat heaters on my Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

595 words

Problem Statement

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

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Rear seat heaters do not turn on
•No heat is felt from the rear seats
•Warning message on the touchscreen regarding seat heater malfunction
•Rear seat heater indicator light does not illuminate
•Front seat heaters functioning normally

Diagnostic Steps

1
Access the vehicle's touchscreen and navigate to the climate settings to check if the rear seat heaters are enabled.
2
Use an OBD-II scanner to check for any error codes related to the seat heater system.
3
Inspect the rear seat heater switches for any physical damage or signs of malfunction.
4
Remove the rear seat bottom cushion to visually inspect the wiring and connectors for the seat heater.
5
Test the seat heater elements using a multimeter to verify continuity.
6
Check the fuse associated with the rear seat heaters to ensure it is not blown.

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
•Socket set
•Trim removal tools
•Multimeter
•Fuse puller or needle-nose pliers

Parts Required

•Rear seat heater element (if continuity test fails)
•Replacement fuse (if blown)

Related Faults

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Diagnostic Steps

1
Access the vehicle's touchscreen and navigate to the climate settings to check if the rear seat heaters are enabled.
2
Use an OBD-II scanner to check for any error codes related to the seat heater system.
3
Inspect the rear seat heater switches for any physical damage or signs of malfunction.
4
Remove the rear seat bottom cushion to visually inspect the wiring and connectors for the seat heater.
5
Test the seat heater elements using a multimeter to verify continuity.
6
Check the fuse associated with the rear seat heaters to ensure it is not blown.

Solution

1. Preparation

Ensure the vehicle is parked safely and turned off.
Disconnect the negative battery terminal to prevent any electrical shorts during repairs.

2. Remove Rear Seat Cushion

Tools Required: Socket set, trim removal tools
Instructions:
1. Remove any fasteners securing the rear seat bottom cushion using the socket set.
2. Carefully lift and pull the rear seat cushion to release it from its mounts.

3. Inspect Wiring and Connectors

Instructions:
1. Locate the wiring harness and connectors that lead to the rear seat heaters.
2. Visually inspect the connectors for corrosion, loose connections, or damage.
3. Ensure all connections are secure and clean any corrosion with electrical cleaner.

4. Test Seat Heater Elements

Tools Required: Multimeter
Instructions:
1. Disconnect the seat heater plug from the heater element.
2. Set the multimeter to the resistance setting.
3. Probe the terminals of the seat heater element; a reading of approximately 5-20 ohms indicates good continuity.
4. If there is no continuity, replace the seat heater element.

5. Replace Fuse if Necessary

Tools Required: Fuse puller or needle-nose pliers
Instructions:
1. Locate the fuse box (usually found under the dashboard or in the trunk).
2. Identify the fuse for the rear seat heaters using the fuse diagram.
3. Remove the fuse and inspect it; if blown, replace it with a fuse of the same amperage.

6. Reassemble Rear Seat

Instructions:
1. Reattach the rear seat cushion by aligning it with the mounts and securing it with the fasteners.
2. Reconnect the negative battery terminal.