B1499 – Lamp Turn Signal Left Circuit Failure

The ODBII code B1499 indicates a malfunction in the left turn signal circuit, suggesting a failure in the wiring, bulb, or related components.

The severity of ODBII code B1499 is moderate.

Common Causes For: B1498 Decklid Punch-Out Sensor Ground Short

• Faulty left turn signal bulb
• Damaged wiring or connectors in the left turn signal circuit
• Malfunctioning turn signal switch
• Defective body control module (BCM)
• Poor ground connection
• Corroded or loose electrical connections
• Short circuit in the left turn signal circuit
• Faulty relay (if applicable)

Common misdiagnosis for B1499 Lamp Turn Signal Left Circuit Failure

• Faulty turn signal bulb
• Defective turn signal switch
• Wiring issues or shorts in the circuit
• Malfunctioning body control module (BCM)
• Poor ground connection
• Corroded connectors
• Faulty relay
• Incorrectly installed or damaged harness

Common Troubleshooting Steps

The OBD-II code B1499 indicates a “Lamp Turn Signal Left Circuit Failure.” This code typically relates to issues with the left turn signal circuit in a vehicle. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check the Turn Signal Bulb:: Inspect the left turn signal bulb for any signs of damage or burnout. Replace the bulb if necessary.
• Inspect the Bulb Socket:: Examine the bulb socket for corrosion, dirt, or damage. Clean or replace the socket if needed.
• Check the Wiring:: Inspect the wiring leading to the left turn signal for any signs of fraying, breaks, or corrosion. Repair or replace any damaged wiring.
• Test the Turn Signal Relay:: Locate the turn signal relay in the fuse box and test it for proper operation. Replace the relay if it is faulty.
• Examine the Fuses:: Check the fuses related to the turn signal circuit. Replace any blown fuses.
• Inspect the Ground Connection:: Ensure that the ground connection for the left turn signal is secure and free of corrosion. Clean and tighten the ground connection if necessary.
• Scan for Additional Codes:: Use an OBD-II scanner to check for any additional trouble codes that may provide more context for the issue.
• Check the Turn Signal Switch:: Test the turn signal switch on the steering column for proper operation. If the switch is faulty, it may need to be replaced.
• Look for Short Circuits:: Inspect the circuit for any short circuits that may be causing the failure. This may require a multimeter to test continuity and voltage.
• Consult Wiring Diagrams:**
• Refer to the vehicle’s wiring diagrams to understand the circuit layout and identify any potential issues. 1
• Perform a Visual Inspection:**
• Conduct a thorough visual inspection of the entire turn signal system, including connectors and harnesses, for any signs of wear or damage. 1
• Reset the Code:**
• After performing repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns. If the issue persists after following these steps, it may be advisable to consult a professional mechanic for further diagnosis and repair.