how to fix my Toyota Highlander Third Generation (2014-2019) that won’t respond to remote start

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

582 words

Problem Statement

Learn how to diagnose and fix the remote start issue in Toyota Highlander (2014-2019). 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.

Symptoms

•Remote start does not activate when button is pressed.
•No engine cranking or start attempt occurs.
•Indicator lights on the dashboard may not illuminate.
•Other remote functions (like locking/unlocking doors) may still work.
•Check engine light may be illuminated (if related to the issue).

Diagnostic Steps

1
Verify the battery condition in the remote; replace if weak or dead.
2
Check the vehicle's battery voltage and connections for corrosion or looseness.
3
Inspect the fuses related to the remote start system for any blown fuses.
4
Scan the vehicle with an OBD-II scanner for any fault codes that may disable remote start.
5
Ensure that all doors are closed, as some systems require all doors to be securely shut for the remote start to function.
6
Check for any aftermarket modifications that may interfere with the remote start system.

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
•Small flathead screwdriver
•Fuse puller or pliers
•Socket set

Parts Required

•Remote battery (if needed)
•Replacement fuse (if blown)

Related Faults

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Diagnostic Steps

1
Verify the battery condition in the remote; replace if weak or dead.
2
Check the vehicle's battery voltage and connections for corrosion or looseness.
3
Inspect the fuses related to the remote start system for any blown fuses.
4
Scan the vehicle with an OBD-II scanner for any fault codes that may disable remote start.
5
Ensure that all doors are closed, as some systems require all doors to be securely shut for the remote start to function.
6
Check for any aftermarket modifications that may interfere with the remote start system.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked in a safe area with enough space for testing.
Disconnect the vehicle's battery to prevent any electrical shorts.

2. Check and Replace Remote Battery

Tools Required: Small flathead screwdriver
Remove the cover of the remote by prying it open with a flathead screwdriver.
Replace the old battery with a new one (commonly CR2032 or CR2025, check the remote specifications).
Reassemble the remote and test the remote start feature.

3. Inspect Vehicle Battery and Connections

Tools Required: Multimeter, socket set
Reconnect the vehicle battery.
Use a multimeter to check the voltage; it should read around 12.6 volts.
Inspect the battery terminals for corrosion; clean them as necessary.
Tighten any loose connections securely.

4. Check Fuses

Tools Required: Fuse puller or pliers
Locate the fuse box (usually under the dashboard or in the engine compartment).
Identify the fuse associated with the remote start system (refer to the owner's manual).
Remove the fuse and inspect it; replace it if blown with the same amperage rating.

5. Address Fault Codes

Tools Required: OBD-II scanner
Connect the OBD-II scanner to the vehicle’s diagnostic port.
Read any diagnostic trouble codes (DTCs) related to the remote start system.
Address the codes by repairing or replacing the affected components as indicated by the codes.

6. Verify Door Closure

Ensure all doors, hood, and trunk are securely closed.
Attempt to use the remote start feature again to see if it responds.