my Toyota Camry Eighth Generation (2018-present) interior lights stay on when doors are closed why

Toyota Camry Eighth Generation (2018-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

547 words

Problem Statement

Learn how to diagnose and fix the issue of interior lights staying on in a 2018-present Toyota Camry. Step-by-step guide with diagnostic procedures.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Interior lights remain on after closing all doors
•Possible battery drainage over time
•Door ajar warning light may illuminate on dashboard
•Lights flicker occasionally
•No response from interior light switch

Diagnostic Steps

1
Inspect all door switches for proper operation and signs of wear or damage.
2
Scan for error codes using an OBD-II scanner to check for any related faults.
3
Check the interior light switch and verify its function.
4
Inspect the wiring harness for any loose connections or signs of damage.
5
Test the door ajar sensor functionality using a multimeter.
6
Examine the body control module (BCM) for faults or software issues.

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

Parts Required

•Door switch (if defective)
•Interior light switch (if defective)
•Door ajar sensor (if defective)

Related Faults

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Diagnostic Steps

1
Inspect all door switches for proper operation and signs of wear or damage.
2
Scan for error codes using an OBD-II scanner to check for any related faults.
3
Check the interior light switch and verify its function.
4
Inspect the wiring harness for any loose connections or signs of damage.
5
Test the door ajar sensor functionality using a multimeter.
6
Examine the body control module (BCM) for faults or software issues.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, and screwdrivers.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect Door Switches

Locate the door switches, typically found on the door frame.
Use a screwdriver to remove the switches if necessary.
Check for continuity using a multimeter; the switch should show continuity when pressed.
Clean the switches with electrical contact cleaner if dirty or replace them if faulty.

3. Check Interior Light Switch

Access the interior light switch located on the overhead console.
Verify that the switch is not stuck in the "ON" position.
Remove the switch and test it with a multimeter to ensure it functions correctly; replace if defective.

4. Inspect Wiring and Connectors

Examine the wiring harness connected to the door switches and the BCM for any signs of wear, fraying, or corrosion.
Reconnect any loose wires and repair damaged wiring using heat-shrink tubing.
Ensure all connectors are firmly seated.

5. Test Door Ajar Sensor

Locate the door ajar sensor, which may be integrated with the door latch mechanism.
Use a multimeter to check for continuity when the door is closed; replace the sensor if it fails to operate correctly.

6. Reconnect Battery and Test

Reconnect the negative battery terminal.
Test the operation of the interior lights by opening and closing the doors to ensure they function properly.