my Toyota Corolla E170 (2013-2019) power locks won't work what's the fix

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

533 words

Problem Statement

Learn how to diagnose and fix non-functional power locks in a 2013-2019 Toyota Corolla E170. Step-by-step guide with tools and diagnostic procedures.

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 prevent shocks or shorts.

Symptoms

•Power lock switches do not activate locks
•Key fob remote does not unlock/lock doors
•Indicator lights on the switches do not illuminate
•Manual locking works but power locking does not
•Potential blown fuse related to power locks

Diagnostic Steps

1
Inspect the power lock fuse in the fuse box for continuity.
2
Use an OBD-II scanner to check for any relevant diagnostic trouble codes (DTCs).
3
Test the power lock switches for proper function using a multimeter.
4
Inspect the wiring harnesses for damage or loose connections at the door and switch.
5
Check the battery voltage to ensure adequate power supply.
6
Verify that the key fob battery is functioning properly.

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
•Socket set
•Screwdrivers (Phillips and flathead)
•Wire connectors (if needed)

Parts Required

•Power lock switch (if faulty)
•Fuses (if blown)
•Wiring harness (if damaged)

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Diagnostic Steps

1
Inspect the power lock fuse in the fuse box for continuity.
2
Use an OBD-II scanner to check for any relevant diagnostic trouble codes (DTCs).
3
Test the power lock switches for proper function using a multimeter.
4
Inspect the wiring harnesses for damage or loose connections at the door and switch.
5
Check the battery voltage to ensure adequate power supply.
6
Verify that the key fob battery is functioning properly.

Solution

1. Preparation

Gather tools and parts.
Disconnect the negative battery terminal to avoid electrical shorts.

Tools Required:

OBD-II scanner
Multimeter
Socket set
Screwdrivers (Phillips and flathead)
Wire connectors (if needed)

2. Inspect the Fuse

Locate the fuse box (usually under the dashboard or in the engine bay).
Identify the fuse for the power locks (refer to the fuse box diagram).
Remove the fuse and inspect it for continuity using a multimeter.
- If the fuse is blown, replace it with a fuse of the same amperage.

3. Test Power Lock Switches

Remove the door panel to access the power lock switches.
Disconnect the connector from the switch.
Using a multimeter, test for continuity when the switch is pressed.
- If there is no continuity, replace the switch.

4. Inspect Wiring Harness

While the door panel is removed, visually inspect the wiring harness for any signs of wear, damage, or corrosion.
Repair or replace damaged wiring as necessary.

5. Check Power Supply

Measure the voltage at the power lock switch connector using a multimeter.
- If voltage is present, the issue likely lies within the switch or actuator.
- If no voltage, trace back to the power source for issues.

6. Reassemble and Test

Reconnect any wiring and the door panel.
Reconnect the battery terminal.
Test the power locks to ensure they are functioning correctly.