B1609 – Illuminated Entry Input Short Circuit To Battery

The ODBII code B1609 indicates a short circuit in the illuminated entry system’s input circuit, which is causing it to be continuously powered or connected to the battery.

The severity of ODBII code B1609 is moderate.

Common Causes For: B1608 Illuminated Entry Input Open Circuit

• Shorted wiring or connectors
• Faulty door switch
• Malfunctioning body control module (BCM)
• Damaged harness or insulation
• Corroded connectors
• Faulty relay
• Improper installation of aftermarket accessories

Common misdiagnosis for B1609 Illuminated Entry Input Short Circuit To Battery

• Faulty door switch
• Wiring harness issues
• Body control module (BCM) failure
• Shorted wiring
• Malfunctioning interior lights
• Battery issues
• Faulty key fob or remote entry system
• Grounding problems

Common Troubleshooting Steps

When dealing with an OBD-II code B1609, which indicates an “Illuminated Entry Input Short Circuit to Battery,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information related to the B1609 code, including wiring diagrams and component locations.
• Visual Inspection: **Wiring and Connectors: Inspect the wiring harness and connectors associated with the illuminated entry system. Look for signs of damage, corrosion, or loose connections.
• **Fuses: Check the relevant fuses for the illuminated entry system. Replace any blown fuses.
• Test the Illuminated Entry Switch: If applicable, test the illuminated entry switch (e.g., door switch) for proper operation. Use a multimeter to check for continuity when the switch is activated.
• Check for Short Circuits: Use a multimeter to check for continuity between the illuminated entry input wire and the battery or ground. A short circuit may indicate a problem in the wiring or components.
• Inspect the Body Control Module (BCM): The BCM often controls the illuminated entry system. Check for any fault codes in the BCM and inspect it for damage or corrosion.
• If necessary, reprogram or replace the BCM according to manufacturer specifications.
• Test Related Components: Check other components related to the illuminated entry system, such as door locks, light bulbs, and any associated relays. Ensure they are functioning correctly.
• Clear the Code: After performing the above checks and repairs, clear the trouble code using an OBD-II scanner. Then, take the vehicle for a test drive to see if the code reappears.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the B1609 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
• Seek Professional Help: If the issue persists after performing these steps, consider consulting a professional mechanic or automotive technician for further diagnosis.Additional Tips: – Always ensure the vehicle is turned off and the battery is disconnected when working on electrical components to avoid injury or damage. – Document any changes or repairs made during the troubleshooting process for future reference. By following these steps, you should be able to identify and resolve the issue related to the B1609 code.