how to fix the headlights flickering on Cadillac Escalade T1XX (2021-Present)

Symptoms

• Headlights flickering intermittently
• Dimming of headlights when other electrical accessories are activated
• Dashboard lights may also flicker
• Possible warning messages on the instrument cluster
• Increased frequency of headlight bulb burnout

Diagnostic Steps

1. Inspect the headlight bulbs for physical damage or signs of wear.
2. Check the battery voltage with a multimeter to ensure it is within the normal range (12.4-12.7 volts when the engine is off).
3. Inspect the headlight wiring harness for any signs of damage, corrosion, or loose connections.
4. Test the alternator output while the engine is running to ensure it is charging correctly (13.5-14.5 volts).
5. Scan the vehicle’s computer for any stored trouble codes related to the lighting system using an OBD-II scanner.
6. Check the ground connections for the headlight circuit to ensure they are secure and free of corrosion.

Solution

1. Preparation

• Gather tools: Multimeter, socket set, OBD-II scanner, and a wiring diagram for the headlight circuit.
• Disconnect the negative terminal of the battery to ensure safety while working on the electrical system.

2. Replace Headlight Bulbs (if damaged)

• Remove the headlight assembly by unscrewing any retaining screws and unclipping the assembly.
• Disconnect the wiring harness from the back of the headlight.
• Replace the damaged bulb with a new bulb, ensuring it is the correct type specified in the owner's manual.
• Reconnect the wiring harness and reassemble the headlight assembly.

3. Repair Wiring and Connections

• Inspect the wiring harness for any frayed wires or loose connectors.
• Use electrical tape or heat shrink tubing to repair any damaged wires.
• Clean and secure any loose connections; consider using a dielectric grease to prevent future corrosion.

4. Check and Replace Ground Connections

• Locate the ground points for the headlight circuit, typically near the battery or on the chassis.
• Remove and clean the ground connections to ensure a good electrical contact.
• Reattach securely and apply dielectric grease to prevent corrosion.

5. Test Alternator and Battery

• Reconnect the negative battery terminal.
• Start the engine and use a multimeter to check the alternator output. If it is not within the specified range, consider replacing the alternator.
• If the battery voltage was low, replace the battery if it's not holding charge.