What Does B1607 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the illuminated entry input circuit, which controls interior and exterior lighting when doors are unlocked or opened. The BCM monitors voltage and continuity in the circuit that activates courtesy lights, dome lights, and puddle lights when the vehicle is approached or accessed. The fault suggests an open circuit, short to ground, short to power, or failed input signal from door switches or unlock sensors.
Common Causes
35%
Faulty door ajar switch or door jamb switch with corroded contacts or broken connector
30%
Damaged or chafed wiring harness between BCM and door switches, often in door hinge area
20%
Failed Body Control Module with internal circuit fault or corrupted programming
10%
Corroded or loose ground connection for illuminated entry circuit or BCM ground points
5%
Faulty keyless entry receiver or remote unlock input signal circuit failure
Diagnostic Steps
1
Step 1: Perform visual inspection of all door jamb switches and connectors at each door opening, checking for physical damage, corrosion, water intrusion, or loose connections. Test each door switch operation manually and observe courtesy light response.
2
Step 2: Using a digital multimeter, backprobe the illuminated entry input circuit at the BCM connector while operating door switches and unlock function. Expected reading should be battery voltage when activated and ground or low voltage when inactive. Check manufacturer wiring diagram for specific pin assignments.
3
Step 3: Inspect wiring harness routing through door hinge areas and A-pillar for wire chafing, breaks, or pinch points. Flex the harness while monitoring circuit continuity with multimeter to identify intermittent opens. Pay special attention to driver door harness.
4
Step 4: Test BCM ground circuits for resistance to chassis ground (should be less than 1 ohm). Verify all body ground points are clean, tight, and free of corrosion. Check for voltage drop across ground connections under load.
5
Step 5: If all circuits and switches test normal, perform BCM functional test using scan tool bidirectional controls to command illuminated entry lights on/off. This isolates BCM internal fault versus external circuit fault.
6
Step 6: After repairs, clear codes, perform unlock and door-open operations multiple times, and verify courtesy lights activate properly. Road test and recheck for code return.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the illuminated entry input circuit, which controls interior and exterior lighting when doors are unlocked or opened. The BCM monitors voltage and continuity in the circuit that activates courtesy lights, dome lights, and pudd...
The most common cause of B1607 (Illuminated Entry Input Circuit Failure) is: Faulty door ajar switch or door jamb switch with corroded contacts or broken connector
Typical repair costs for B1607 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects convenience lighting features. No immediate safety risk, though lack of interior illumination when entering vehicle at night may pose minor inconvenience and reduced visibility when accessing vehicle.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1607 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Lighting System
Difficulty
Type
Manufacturer
Recommended Tools
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