B1608 – OBD-II DTC

OBD-II DTC B1608 – Illuminated Entry Input Open Circuit

DTC B1608 meaning

DTC B1608 refers to an issue with the illuminated entry system in a vehicle. Specifically, it indicates an open circuit in the input signal related to the illuminated entry feature. This system is designed to activate interior lights when the vehicle is unlocked or when a door is opened, enhancing convenience and safety for the driver and passengers.

DTC B1608 symptoms

Common symptoms associated with DTC B1608 may include:

• Interior lights not illuminating when doors are opened or unlocked
• Malfunctioning keyless entry system
• Inconsistent operation of the vehicle’s lighting system
• Possible warning lights on the dashboard

DTC B1608 causes

The causes of DTC B1608 can vary, but typical reasons include:

• Faulty door switch or sensor
• Wiring issues, such as frayed or broken wires
• Corrosion or poor connections in the electrical system
• Defective body control module (BCM)

DTC B1608 seriousness

DTC B1608 is generally considered a moderate issue. While it may not affect the vehicle’s drivability, it can lead to inconvenience and safety concerns due to the lack of interior lighting. Additionally, it may indicate underlying electrical problems that could affect other systems in the vehicle.

How to diagnose DTC B1608

To diagnose DTC B1608, follow these steps:

• Use an OBD-II scanner to confirm the presence of the DTC.
• Inspect the vehicle’s wiring and connectors related to the illuminated entry system.
• Test the door switches for proper operation.
• Check the body control module for any faults or updates.
• Perform continuity tests on the circuit to identify any breaks or shorts.

How to fix DTC B1608 step-by-step instructions

To fix DTC B1608, follow these step-by-step instructions:

1. Start by using an OBD-II scanner to clear the DTC and see if it returns.
2. Inspect the door switches for proper function and replace any faulty switches.
3. Examine the wiring harness for any signs of damage, fraying, or corrosion.
4. Repair or replace any damaged wiring or connectors.
5. Check the body control module for updates or faults and replace if necessary.
6. Re-test the system to ensure the illuminated entry feature is functioning correctly.

How to erase DTC B1608

To erase DTC B1608, follow these steps:

• Connect an OBD-II scanner to the vehicle’s diagnostic port.
• Turn the ignition key to the “On” position without starting the engine.
• Access the DTC menu on the scanner and select the option to clear or erase codes.
• Confirm the action and wait for the scanner to complete the process.
• 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.