how to fix the intermittent wipers on my Ford Mustang S550 (2015-2023)?

Ford Mustang S550 (2015-2023)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

591 words

Problem Statement

Learn how to diagnose and fix intermittent wipers on Ford Mustang S550 (2015-2023). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shock hazards.

Symptoms

•Wipers do not activate at all in intermittent mode
•Wipers operate continuously instead of intermittently
•Wipers only function at one speed (either low or high)
•Wiper delay timing is inconsistent
•No sound or feedback when the wiper switch is activated

Diagnostic Steps

1
Check the wiper fuse in the fuse box for continuity.
2
Inspect the wiper switch for physical damage or wear.
3
Use an OBD-II scanner to check for any related error codes.
4
Test the wiper motor for functionality by applying direct power.
5
Inspect the wiring and connectors for corrosion or loose connections.
6
Check the intermittent wiper relay operation by swapping with a known good relay.

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
•Phillips screwdriver
•Fuse puller or needle-nose pliers
•Multimeter

Parts Required

•Wiper fuse (if blown)
•Wiper switch (if defective)
•Wiper motor (if faulty)
•Intermittent wiper relay (if defective)

Related Faults

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Diagnostic Steps

1
Check the wiper fuse in the fuse box for continuity.
2
Inspect the wiper switch for physical damage or wear.
3
Use an OBD-II scanner to check for any related error codes.
4
Test the wiper motor for functionality by applying direct power.
5
Inspect the wiring and connectors for corrosion or loose connections.
6
Check the intermittent wiper relay operation by swapping with a known good relay.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a flat surface.
Disconnect the battery to prevent electrical shock.

2. Check and Replace the Wiper Fuse

Locate the fuse box, typically under the dashboard or in the engine compartment.
Identify the wiper fuse using the diagram on the fuse box cover.
Remove the fuse using a fuse puller or needle-nose pliers.
Inspect the fuse; if blown, replace it with a fuse of the same amperage (usually 10A or 15A).
Reconnect the battery and test the wipers.

3. Inspect and Replace the Wiper Switch

Remove the steering column cover using a Phillips screwdriver.
Disconnect the wiring harness from the wiper switch.
Remove the wiper switch by unscrewing it from its mounting position.
Install a new wiper switch by reversing the removal steps.
Reconnect the battery and test the wipers.

4. Test and Replace the Wiper Motor

Access the wiper motor by removing the wiper arms and the cowl cover.
Disconnect the motor harness and apply direct battery power to the motor terminals to test functionality.
If the motor does not operate, replace it with a new motor.
Reassemble the wiper arms and cowl cover.

5. Check Wiring and Connectors

Inspect all wiring leading to the wiper motor and switch for damage or corrosion.
Clean any corroded connectors with electrical contact cleaner.
Repair or replace damaged wiring as necessary.

6. Test and Replace the Intermittent Wiper Relay

Locate the relay in the fuse box or under the dashboard.
Remove the relay and swap it with a similar relay from another circuit.
If wipers function correctly with the swapped relay, replace the faulty relay with a new one.