What Does B1795 Mean?
This code indicates that the Body Control Module (BCM) has detected an open circuit in the low-beam headlamp circuit, meaning there is a break in the electrical path preventing current flow to one or both low-beam headlamps. The BCM monitors the headlamp circuits continuously and sets this code when it cannot detect proper current flow through the low-beam circuit. This is a manufacturer-specific body system code related to the vehicle's exterior lighting system.
Common Causes
45%
Burnt out low-beam headlamp bulb or poor bulb socket connection
25%
Corroded, damaged, or loose wiring connector at headlamp assembly
20%
Broken or damaged wiring between BCM and headlamp assembly
10%
Faulty headlamp relay or BCM output driver circuit
Diagnostic Steps
1
Step 1: Perform a visual inspection of both low-beam headlamp bulbs by removing them from their sockets. Check for broken filaments, darkened glass, or signs of moisture intrusion. Test bulb continuity with a multimeter set to resistance mode (should read 0.5-3 ohms across bulb terminals).
2
Step 2: Inspect the headlamp bulb sockets and connectors for corrosion, burnt terminals, melted plastic, or pushed-back pins. Clean any corrosion with electrical contact cleaner and a small wire brush. Verify connector lock mechanisms are secure.
3
Step 3: Using a multimeter, check for battery voltage at the headlamp connector with the low-beam headlights activated (ignition on, headlight switch on low-beam position). The power supply wire should show 12-14 volts. If no voltage present, trace wiring back toward BCM or relay box.
4
Step 4: Test ground circuit continuity by measuring resistance between the headlamp ground wire and battery negative terminal with multimeter (should be less than 0.5 ohms). Check for damaged wiring harness along frame rails, inner fender areas, and near grounding points.
5
Step 5: If voltage and ground are present at connector but bulb tests good, check relay operation by swapping with a known-good relay of same specification. Listen for audible click when activating headlights and verify relay coil resistance (typically 70-90 ohms).
6
Step 6: After repairs, clear the code, cycle the headlights on/off multiple times, and perform a test drive to verify proper operation and confirm the code does not return.
Estimated Repair Cost
$30 - $350
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an open circuit in the low-beam headlamp circuit, meaning there is a break in the electrical path preventing current flow to one or both low-beam headlamps. The BCM monitors the headlamp circuits continuously and sets this code when...
The most common cause of B1795 (Lamp Headlamp Low-Beam Circuit Open) is: Burnt out low-beam headlamp bulb or poor bulb socket connection
Typical repair costs for B1795 range from $30 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driving without functioning low-beam headlamps is illegal and extremely dangerous, especially at night or in poor visibility conditions, as it reduces driver visibility and makes your vehicle nearly invisible to other drivers. This should be repaired immediately before driving in darkness or adverse weather.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1795 to identify the root cause.
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Quick Info
Category
Body
System
Exterior Lighting System
Difficulty
Type
Manufacturer
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