B1607 — Illuminated Entry Input Circuit Failure #

Note: The code description may vary depending on the vehicle manufacturer. Always refer to OEM (Original Equipment Manufacturer) documentation for the most accurate definition.

• Illuminated Entry Input Circuit Failure (generic/OEM Ford, Toyota)
• Illuminated Entry Signal Circuit Malfunction (Nissan)
• Interior Light Entry Input Circuit Fault (Chrysler)

Summary of DTC B1607 #

DTC B1607 indicates a malfunction in the circuit related to the illuminated entry system. This system is designed to automatically turn on a vehicle’s interior lights when the doors are unlocked, making entry safer and more convenient. When the input circuit fails, the Body Control Module (BCM)—the electronic unit managing electrical systems—cannot properly recognize the signal to activate interior lights. The result is either no lighting or lights staying on unexpectedly. This code doesn’t directly affect engine performance but can point to underlying electrical or wiring issues. Prompt diagnosis is important to avoid further electrical complications.

Common Symptoms for Code B1607 #

When code B1607 appears, several symptoms can surface, often affecting daily vehicle use. Some drivers may not notice the problem immediately, especially if they don’t use keyless entry or rarely drive at night. However, over time, these signs become more apparent and may include:

• Interior courtesy lights fail to turn on when doors are unlocked
• Interior lights remain on after doors are closed
• Delayed or no response from the illuminated entry feature
• Warning lights or chimes related to the BCM
• Battery discharge due to lights staying on

Probable Causes for Code B1607 #

The illuminated entry circuit is a relatively simple but crucial part of the vehicle’s electrical system. Problems can arise from several sources, most commonly linked to wiring or switches. Here are the most frequent causes, ordered by likelihood:

1. Faulty door ajar switch or door latch switch
2. Damaged or corroded wiring/connectors in the illuminated entry circuit
3. Defective Body Control Module (BCM)
4. Burned-out or incorrectly installed interior bulbs
5. Aftermarket alarm or remote start systems interfering with OEM wiring
6. Short to ground or open circuit in the entry wiring

Step-by-Step Diagnosis for Code B1607 #

Diagnosing B1607 requires patience and a systematic approach. Electrical gremlins can hide in plain sight, so double-check each step before moving on. Here’s how a professional technician would tackle this code:

• Verify the code and freeze-frame data using a scan tool
• Inspect interior lights for proper function (with key fob, door open, ignition cycle, etc.)
• Check the door ajar/latch switches for proper operation and continuity
• Visually inspect wiring and connectors between the switches, BCM, and interior lamps for damage or corrosion
• Test the BCM output with a multimeter or test light as per OEM procedures
• Inspect for any aftermarket accessories spliced into relevant circuits
• Clear the code, operate the system, and monitor for recurrence

Possible Repairs for Code B1607 #

Once the root cause is identified, the solution often involves straightforward electrical repairs. However, in some cases, replacing a component may be necessary. Here are the most common fixes, matched to the typical causes:

• Repair or replace a faulty door ajar/latch switch
• Clean, repair, or replace corroded/damaged wiring and connectors
• Replace the Body Control Module (only after confirming all other possibilities)
• Replace any burned-out or incorrect interior bulbs
• Remove or properly rewire any aftermarket systems interfering with the entry circuit
• Fix shorts to ground or open circuits as needed

Is It Safe to Drive with Code B1607? #

Yes, but with limitations. Code B1607 does not directly affect your vehicle’s ability to drive or its safety systems. However, malfunctioning interior lights may be inconvenient, especially at night, and could contribute to battery drain if lights stay on. Address the issue promptly to avoid unnecessary complications, particularly if you rely on illuminated entry for safety or convenience.

Vehicles Most Commonly Affected by Code B1607 #

While B1607 can appear on a wide range of modern vehicles, it’s more frequently reported on certain brands and models—often those using advanced BCM-controlled interior lighting. Based on field experience, the following vehicles are more likely to encounter this code:

• Ford Focus, Fusion, F-150 (various years)
• Toyota Camry, Corolla, RAV4 (mid-2000s and newer)
• Nissan Altima, Maxima, Rogue
• Chrysler 300, Pacifica, Town & Country
• Hyundai Sonata, Elantra (recent generations)

Common Mistakes & Best Practices for Code B1607 #

Electrical diagnostics can lead even experienced technicians astray if they skip steps or overlook details. Here are some frequent errors—and tips to avoid them:

• Replacing the BCM prematurely without checking switches or wiring
• Overlooking aftermarket accessories that may disrupt the entry circuit
• Assuming all interior lights are controlled the same way—some may have independent grounds or controls
• Neglecting to check for corrosion in door jambs or beneath carpets
• Failing to verify repair by cycling the system and re-scanning for codes

Express FAQ for Code B1607 #

Drivers and technicians often have pressing questions about illuminated entry issues. Here are quick answers to the most frequent ones:

• Q: Will code B1607 cause my vehicle to fail inspection?
  A: No, this code is not emissions-related and shouldn’t cause you to fail a standard inspection, but unresolved electrical issues can sometimes trigger other warnings.
• Q: Can I clear the code and ignore it?
  A: You can clear the code, but if the root cause isn’t fixed, it will likely return. Ignoring it may also lead to battery drain or further BCM issues.