my Ram 1500 DT (2019-Present) rear lights are not working, what could be the issue?

Ram 1500 DT (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

534 words

Problem Statement

Learn how to diagnose and fix rear lights not working on 2019-present Ram 1500 DT. 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 shock or short circuits.

Symptoms

•Rear lights do not illuminate when headlights are turned on
•No response from brake lights when pedal is pressed
•No illumination from turn signals at the rear
•Possible 'Check Brake Light' warning on the dashboard
•Fuses related to the rear lights are not blown

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of damage or burnout.
2
Check the fuse box for the rear light fuse; replace if necessary.
3
Use an OBD-II scanner to check for any error codes related to the lighting system.
4
Inspect the wiring and connectors for any signs of corrosion or damage.
5
Test the rear light switch and circuit continuity with a multimeter.
6
Verify that the body control module (BCM) 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
•Screwdriver set
•Pliers or fuse puller
•Electrical contact cleaner

Parts Required

•Replacement bulbs (e.g., 3057)
•Replacement fuse (if necessary)

Related Faults

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Diagnostic Steps

1
Inspect the rear light bulbs for any signs of damage or burnout.
2
Check the fuse box for the rear light fuse; replace if necessary.
3
Use an OBD-II scanner to check for any error codes related to the lighting system.
4
Inspect the wiring and connectors for any signs of corrosion or damage.
5
Test the rear light switch and circuit continuity with a multimeter.
6
Verify that the body control module (BCM) is functioning properly.

Solution

1. Preparation

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

2. Inspect and Replace Bulbs

Remove the rear light assembly by unscrewing the retaining screws.
Pull the assembly out and disconnect the wiring harness.
Replace any burnt-out bulbs with new bulbs, ensuring they are the correct type (e.g., 3057 for brake lights).
Reconnect the wiring harness and reinstall the light assembly.

3. Check and Replace Fuses

Locate the fuse box under the dashboard or in the engine compartment.
Identify the fuse for the rear lights using the fuse diagram.
Remove the fuse using a fuse puller or pliers. Check if the filament is intact.
If blown, replace it with a fuse of the same amperage (usually 15A for rear lights).

4. Inspect Wiring and Connectors

Visually inspect the wiring harness leading to the rear lights for fraying or damage.
Clean any corrosion from connectors using electrical contact cleaner.
Re-secure any loose connections or replace damaged wires as needed.

5. Test the Body Control Module (BCM)

Reconnect the battery and turn on the ignition.
Use a multimeter to test the output from the BCM to the rear lights.
If the BCM is not sending the signal, further diagnosis or replacement may be necessary.