how to fix Tesla Model S Plaid's rear windshield wiper not working

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

599 words

Problem Statement

Learn how to diagnose and fix the rear windshield wiper not working on Tesla Model S Plaid. Step-by-step guide with tools and safety tips.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle's 12V battery before starting repairs to prevent electrical shock.
•Allow the rear hatch to remain open while working to prevent injury from accidental closure.

Symptoms

•Rear windshield wiper does not activate
•No sound or movement when wiper switch is engaged
•Front windshield wiper operates normally
•Check for wiper-related error messages on the display
•Water spray for the rear wiper is non-functional (if equipped)

Diagnostic Steps

1
Inspect the rear wiper blade and arm for any visible damage or blockage.
2
Check the wiper control settings on the infotainment system to ensure the rear wiper is enabled.
3
Use an OBD-II scanner to check for any error codes related to the wiper system.
4
Test the rear wiper motor by applying direct power to the motor terminals.
5
Inspect the wiring and connectors for any corrosion or disconnection.
6
Verify the operation of the rear wiper switch on the steering column.

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

•Flathead screwdriver
•Torx screwdriver set
•Multimeter
•Wire strippers
•Soldering iron

Parts Required

•Rear wiper motor (if replacement is necessary)
•Wiper blade assembly (if worn)

Related Faults

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Diagnostic Steps

1
Inspect the rear wiper blade and arm for any visible damage or blockage.
2
Check the wiper control settings on the infotainment system to ensure the rear wiper is enabled.
3
Use an OBD-II scanner to check for any error codes related to the wiper system.
4
Test the rear wiper motor by applying direct power to the motor terminals.
5
Inspect the wiring and connectors for any corrosion or disconnection.
6
Verify the operation of the rear wiper switch on the steering column.

Solution

1. Preparation

Tools Required: Flathead screwdriver, Torx screwdriver set, multimeter, wire strippers, soldering iron (if needed).
Safety Warnings: Disconnect the vehicle's 12V battery before starting repairs to prevent electrical shock.

2. Remove Rear Wiper Arm

Sub-steps:
1. Use a flathead screwdriver to carefully pry off the plastic cover at the base of the rear wiper arm.
2. Use a Torx screwdriver to remove the nut securing the wiper arm to the motor shaft.
3. Gently wiggle and pull the wiper arm off the shaft.

3. Inspect Rear Wiper Motor

Sub-steps:
1. Locate the rear wiper motor assembly (usually under the rear hatch panel).
2. Disconnect the electrical connector from the motor.
3. Use a multimeter to test for voltage at the motor connector when the wiper switch is activated.
4. If no voltage is present, trace wiring back to the switch for continuity.
5. If voltage is present but the motor does not operate, replace the rear wiper motor.

4. Replace or Repair Wiring

Sub-steps:
1. Inspect the wiring harness for frays or breaks, especially near the hinge area of the rear hatch.
2. If damaged, use wire strippers to cleanly cut the wire and splice in a new section of wire.
3. Solder the connections and cover with heat shrink tubing to prevent future issues.

5. Reassemble Components

Sub-steps:
1. Reconnect the rear wiper motor harness.
2. Reinstall the rear wiper arm and secure it with the Torx nut.
3. Snap the plastic cover back over the base of the wiper arm.