B1374 – Illuminated Entry Relay Short To Ground

The ODBII code B1374 indicates a malfunction in the illuminated entry relay circuit, specifically that the relay is shorted to ground, which can prevent the interior lights from functioning properly when the vehicle is unlocked.

The severity of ODBII code B1374 is moderate.

Common Causes For: B1373 Illuminated Entry Relay Short To Battery

• Faulty illuminated entry relay
• Short circuit in wiring harness
• Corroded or damaged connectors
• Faulty door switches
• Grounding issues
• Malfunctioning body control module (BCM)

Common misdiagnosis for B1374 Illuminated Entry Relay Short To Ground

• Faulty door switch
• Malfunctioning body control module (BCM)
• Wiring issues or shorts in the harness
• Defective interior light circuit
• Battery or charging system problems
• Faulty ignition switch
• Issues with the keyless entry system

Common Troubleshooting Steps

When dealing with an OBD-II code B1374, which indicates a problem with the Illuminated Entry Relay (specifically a short to ground), 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 regarding the illuminated entry relay and the associated wiring diagrams.
• Visual Inspection: Inspect the wiring and connectors related to the illuminated entry relay for any signs of damage, corrosion, or loose connections.
• Look for frayed wires, broken connectors, or any signs of wear that could cause a short to ground.
• Test the Relay: Locate the illuminated entry relay and test it using a multimeter. Check for continuity and ensure that it operates correctly when energized.
• If the relay is faulty, replace it and see if the code returns.
• Check for Shorts to Ground: Use a multimeter to check for continuity between the relay circuit and ground. If you find continuity where there shouldn’t be any, you likely have a short to ground.
• Trace the wiring back to find the source of the short. Look for areas where the wiring may be pinched or damaged.
• Inspect Related Components: Check other components that may be connected to the illuminated entry system, such as door switches, body control modules, and any associated wiring.
• Ensure that all switches are functioning properly and not stuck in the “on” position.
• 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 the Code: After performing repairs or replacements, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult a Professional: If the issue persists after following these steps, it may be beneficial to consult a professional mechanic or an automotive electrician who can perform more advanced diagnostics.
• Document Findings: Keep a record of any findings, repairs made, and codes that were present. This documentation can be helpful for future reference or if you need to seek professional help. By following these steps, you should be able to identify and resolve the issue related to the B1374 code. Always ensure safety precautions are taken when working on electrical systems in vehicles.