my Ram 1500 DT (2019-Present) interior lights stay on, what's causing this?

Ram 1500 DT (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

511 words

Problem Statement

Learn how to diagnose and fix the issue of interior lights staying on in a 2019 Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shorts or shocks.

Symptoms

•Interior lights do not turn off after closing doors
•Dome light remains on while driving
•Battery drain due to continuous light operation
•Possible flickering of interior lights
•Malfunctioning door ajar switch warning on the dashboard

Diagnostic Steps

1
Inspect the door ajar switches for proper operation and any physical damage.
2
Check the interior light switch settings to ensure they are not set to 'on'.
3
Scan the vehicle's computer system for any error codes related to lighting or body control modules.
4
Verify the operation of the body control module (BCM) by checking for recent software updates or faults.
5
Examine the wiring and connectors related to the interior lighting for signs of wear or short circuits.

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
•Trim removal tool

Parts Required

•Door ajar switch (if faulty)
•Interior light switch (if defective)
•Body control module (if necessary)

Related Faults

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Diagnostic Steps

1
Inspect the door ajar switches for proper operation and any physical damage.
2
Check the interior light switch settings to ensure they are not set to 'on'.
3
Scan the vehicle's computer system for any error codes related to lighting or body control modules.
4
Verify the operation of the body control module (BCM) by checking for recent software updates or faults.
5
Examine the wiring and connectors related to the interior lighting for signs of wear or short circuits.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the negative battery terminal to ensure safety while working on the electrical system.

2. Inspect and Replace Door Ajar Switches

Sub-steps:
1. Remove the door panels to access the door ajar switches.
  - Tools required: Socket set, trim removal tool.
2. Disconnect the electrical connector from the door ajar switch.
3. Use a multimeter to test the switch for continuity; replace if faulty.
4. Reinstall the new switch and reconnect the electrical connector.
5. Reattach the door panels securely.

3. Check and Adjust Interior Light Switch

Sub-steps:
1. Locate the interior light switch on the overhead console.
2. Ensure the switch is set to "door" or "off" position.
3. If the switch is defective, replace it by unscrewing the console and disconnecting the wiring.

4. Inspect Body Control Module (BCM)

Sub-steps:
1. Locate the BCM, generally found under the dashboard.
2. Check for software updates or fault codes using an OBD-II scanner.
3. If necessary, reprogram the BCM or replace it if it’s malfunctioning.

5. Reconnect Battery and Test

Sub-steps:
1. Reconnect the negative battery terminal.
2. Open and close all doors to ensure the interior lights operate correctly.
3. Test drive the vehicle to confirm that the lights turn off after exiting.