B1606 – Lamp Anti-Theft Indicator Circuit Short To Ground

The ODBII code B1606 indicates a short circuit to ground in the anti-theft indicator lamp circuit, which may prevent the indicator from functioning properly.

The severity of ODBII code B1606 is moderate.

Common Causes For: B1605 Lamp Anti-Theft Indicator Circuit Short To Battery

• Shorted wiring or connectors in the anti-theft system circuit.
• Faulty anti-theft module.
• Damaged or corroded ground connections.
• Malfunctioning ignition switch.
• Defective anti-theft indicator lamp.

Common misdiagnosis for B1606 Lamp Anti-Theft Indicator Circuit Short To Ground

• Faulty anti-theft module
• Shorted wiring harness
• Defective ignition switch
• Malfunctioning body control module (BCM)
• Bad ground connections
• Incorrectly installed aftermarket alarm system
• Faulty key fob or transponder
• Damaged or corroded connectors

Common Troubleshooting Steps

When dealing with an OBD-II code B1606, which indicates a “Lamp Anti-Theft Indicator Circuit Short To Ground,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Understand the Code: B1606 typically relates to the anti-theft system in the vehicle. It indicates that the circuit for the anti-theft indicator lamp is shorted to ground, which can prevent the system from functioning correctly.
• Visual Inspection: **Wiring and Connectors: Inspect the wiring harness and connectors related to the anti-theft system. Look for any signs of damage, fraying, or corrosion.
• **Indicator Lamp: Check the anti-theft indicator lamp itself for any signs of damage or improper installation.
• Check for Short Circuits: **Multimeter Testing: Use a multimeter to check for continuity in the circuit. Disconnect the anti-theft indicator lamp and measure resistance to ground. A low resistance reading indicates a short to ground.
• **Inspect Ground Points: Ensure that all ground points related to the anti-theft system are clean and secure.
• Inspect the Anti-Theft Module: If applicable, check the anti-theft module for any signs of damage or malfunction. This may involve checking for proper power and ground at the module.
• Check for Faulty Components: **Indicator Lamp: If the indicator lamp is faulty, it may cause a short circuit. Test or replace the lamp if necessary.
• **Wiring Harness: Inspect the wiring harness for any pinched or damaged wires that could be causing a short.
• Scan for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using an OBD-II scanner. Then, take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: If the issue persists, consult the vehicle’s service manual for specific diagnostic procedures related to the anti-theft system and B1606 code.
• Professional Help: If you are unable to resolve the issue after these steps, consider seeking help from a professional mechanic or automotive technician who has experience with the specific make and model of your vehicle.Conclusion By following these troubleshooting steps, you should be able to identify the cause of the B1606 code and take appropriate action to resolve the issue. Always ensure safety precautions are taken when working on vehicle electrical systems.