B1607 — Illuminated Entry Input Circuit Failure

OBD2 code B1607 flags a problem with the body electrical system (illuminated entry input circuit failure). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, body control module (BCM) fault, corroded or loose connectors.

body electrical

Is it safe to drive?

Short-term driving is OK Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1607 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the body electrical system for damage, corrosion, chafing or poor contact.
Subsystem check Operate the affected function while watching its switch and motor PIDs in live data.
Subsystem check Inspect connectors and wiring at flex points (door jambs, tailgate hinges) — wires break there first.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1607 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1607 (parts and labor, USD, independent shop rates): BCM repair or replacement: $300–$900; Repair wiring or connectors: $80–$250; Replace the switch or actuator: $120–$450. Overall, fixing B1607 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code B1607 mean?

Is it safe to drive with B1607?

Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How do I diagnose B1607 myself?

Start with a scan: confirm B1607, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the illuminated entry input circuit, and verify the suspect component against live data before buying parts.

What are the symptoms of B1607?

Drivers most often notice: the affected function (locks, windows, lighting, wipers) works intermittently or not at all, warning light on the dashboard, no impact on engine operation in most cases.

Will B1607 clear itself?

Sometimes B1607 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

When your vehicle's body control module detects an irregularity in the illuminated entry input circuit, it logs OBD2 trouble code B1607. This particular fault points to a problem within the body electrical system, specifically in the circuit that controls illuminated entry functions such as interior lighting that activates when doors unlock or the courtesy lamps that illuminate the footwells. The module continuously monitors voltage and ground signals in this circuit and flags B1607 when those signals fall outside acceptable parameters.

To confirm B1607, the control module performs multiple verification checks across several drive cycles before logging the code as an active fault. This prevents false triggers from temporary electrical noise. When the code sets, the module also records a freeze frame snapshot capturing engine speed, load percentage, coolant temperature, and vehicle speed at the exact moment of failure. Reviewing this data first often points you directly toward the root cause rather than chasing symptoms.

The illuminated entry system operates through a network of switches, motors, wiring, and the body control module itself. When you unlock the doors or open a door handle, the BCM receives an input signal and responds by activating interior lights, sometimes puddle lamps, and other courtesy features. If any component in this chain fails or delivers a signal that doesn't match expectations, B1607 results.

Common Symptoms of B1607

Interior courtesy lights fail to illuminate when unlocking or opening doors, or they stay on continuously
Puddle lamps and door-mounted accent lights may stop working or behave erratically
The illuminated entry feature works only intermittently, functioning properly sometimes and failing other times
A warning light may appear on the dashboard, depending on the vehicle's configuration
Other body functions sharing the same circuit—such as certain window controls or lock indicators—may exhibit problems simultaneously
Engine performance remains unaffected in most cases, as this fault belongs to the body electrical system rather than the powertrain

What Causes B1607?

The most frequent culprit behind B1607 is a wiring problem in areas exposed to moisture and flexing, particularly the door jambs where wiring passes through rubber boots. Wires break or chafe here before anywhere else on the vehicle.

A blown fuse or failed relay serving the illuminated entry circuit can also trigger B1607. The BCM loses its reference voltage or ground, interprets this as a circuit failure, and logs the code accordingly.

Corroded or loose electrical connectors disrupt signal integrity. Moisture intrusion at connectors—especially in older vehicles or those exposed to road salt—creates high resistance that the module flags as a fault.

The body control module itself may be defective, though this represents a less common cause compared to wiring and connector issues. BCM failure typically produces multiple body-related codes simultaneously.

A faulty switch in the door handle assembly, trunk lid, or ignition switch can send incorrect signals to the BCM, causing B1607 if the illuminated entry function is involved.

Actuator motors controlling lamps or the specific circuits they power occasionally fail, creating an open or short condition that sets this code.

How to Diagnose B1607

Begin by connecting an OBD2 scanner and retrieving all stored codes, including the freeze frame data associated with B1607. Note the driving conditions recorded when the fault occurred, then clear the code and road-test the vehicle under similar circumstances to observe whether B1607 returns.

Search for manufacturer technical service bulletins relevant to B1607 for your specific make, model, and model year. Factory-issued TSBs often document known issues and provide diagnostic procedures or software updates that resolve the problem without part replacement.

Perform a thorough visual inspection of the wiring harness in the door jambs and any areas where wires bend or flex. Look for cracked insulation, broken strands inside the wire, and signs of corrosion or moisture damage at connectors.

Use the scanner's live data function to monitor the switch and motor operation while physically operating the affected components. Watch for expected PID changes that confirm the BCM is receiving proper input signals.

Check all related fuses and relays with a test light or multimeter. A fuse that appears intact may still have internal resistance causing voltage drop sufficient to trigger B1607.

Repair Options and Costs

The cost to resolve B1607 varies significantly depending on which component actually failed. Most repairs fall within the following ranges at independent shop labor rates in the United States.

Repairing or replacing damaged wiring and connectors typically costs between $80 and $250, depending on the extent of the damage and accessibility of the affected circuit. This represents the most common fix and should be attempted first.

Replacing a faulty switch or actuator in the door handle or illuminated entry circuit generally runs $120 to $450 for parts and labor combined.

Body control module repair or replacement is the most expensive scenario, ranging from $300 to $900 depending on whether the BCM can be rebuilt or requires full replacement and reprogramming.

In total, expect to pay anywhere from $80 to $900 to properly repair B1607. An accurate diagnosis before purchasing parts prevents wasted money on components that are not actually causing the fault.

Can You Drive with B1607?

In most circumstances, B1607 presents no immediate safety concern and the vehicle remains driveable. Body control codes rarely affect engine operation, transmission function, or braking systems. However, consider the practical implications: if your courtesy lights fail, you lose visibility when entering or exiting the vehicle at night. If the fault involves exterior lighting circuits, have it repaired promptly before driving in reduced visibility conditions. Central locking issues associated with this code could leave the vehicle unsecured, warranting sooner attention in such cases.