B1605 – OBD-II DTC

OBD-II DTC B1605 – Lamp Anti-Theft Indicator Circuit Short To Battery

DTC B1605 meaning

DTC B1605 refers to a diagnostic trouble code indicating a short circuit in the anti-theft indicator circuit, specifically a short to battery. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle systems for faults. The anti-theft indicator is a crucial component that signals the status of the vehicle’s security system.

DTC B1605 symptoms

Common symptoms associated with DTC B1605 may include:

• The anti-theft indicator light remains illuminated.
• The vehicle may not start or may experience starting issues.
• Other warning lights may appear on the dashboard.
• Possible intermittent electrical issues within the vehicle.

DTC B1605 causes

Several factors can lead to the triggering of DTC B1605, including:

• A short circuit in the anti-theft indicator circuit wiring.
• Faulty anti-theft module or control unit.
• Corroded or damaged connectors in the circuit.
• Issues with the vehicle’s battery or electrical system.

DTC B1605 seriousness

The seriousness of DTC B1605 can vary. While it may not prevent the vehicle from operating, it can lead to starting issues and may compromise the vehicle’s security system. Ignoring this code could result in further electrical problems or potential theft of the vehicle.

How to diagnose DTC B1605

To diagnose DTC B1605, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1605 code.
2. Inspect the anti-theft indicator circuit wiring for visible damage or corrosion.
3. Check the connectors for proper connection and signs of wear.
4. Test the anti-theft module for functionality.
5. Measure voltage and continuity in the circuit to identify shorts.

How to fix DTC B1605 step-by-step instructions

To fix DTC B1605, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors in the anti-theft indicator circuit.
3. Replace the anti-theft module if it is found to be faulty.
4. Reconnect the battery and clear the DTC using an OBD-II scanner.
5. Test the vehicle to ensure the anti-theft indicator functions correctly and the code does not return.

How to erase DTC B1605

To erase DTC B1605, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the trouble codes menu on the scanner.
3. Select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to check if the code reappears.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.