What Does B1568 Mean?
DTC B1568 indicates the Body Control Module (BCM) has detected an open circuit in the high-beam headlamp circuit. This means electrical current is not flowing properly through the high-beam lamp wiring, connector, or bulb itself. The BCM continuously monitors headlamp circuits and sets this code when it detects no current flow when the high beams are commanded on.
Common Causes
45%
Burned out high-beam bulb or poor bulb socket connection
25%
Damaged or corroded wiring harness between BCM and high-beam lamp
20%
Faulty headlamp connector or terminal corrosion at lamp assembly
10%
Failed high-beam relay or internal BCM circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of the high-beam bulb(s) for obvious filament damage or blackening, and check bulb socket for corrosion, melting, or poor contact. Remove and reinstall bulb to ensure proper seating.
2
Step 2: Using a digital multimeter, check for battery voltage at the high-beam bulb connector with high beams activated. Should read 12-14V on the power wire. If no voltage present, trace wiring back toward BCM/relay.
3
Step 3: Check continuity of the ground circuit from the bulb socket to chassis ground with multimeter in ohms mode. Should read less than 1 ohm resistance. Clean and tighten ground connection if high resistance found.
4
Step 4: Inspect the high-beam relay (if equipped) by swapping with an identical relay from another circuit, or bench test the relay with a power supply. Listen for audible click when relay is energized.
5
Step 5: Check headlamp connector terminals for corrosion, bent pins, or water intrusion. Clean with electrical contact cleaner and dielectric grease. Wiggle test connectors while monitoring for intermittent operation.
6
Step 6: After repairs, clear codes, cycle high beams on/off multiple times, and verify proper operation. Road test to confirm code does not return and high beams function normally.
Estimated Repair Cost
$50 - $350
Parts + labor, varies by vehicle and location
DTC B1568 indicates the Body Control Module (BCM) has detected an open circuit in the high-beam headlamp circuit. This means electrical current is not flowing properly through the high-beam lamp wiring, connector, or bulb itself. The BCM continuously monitors headlamp circuits and sets this code whe...
The most common cause of B1568 (Lamp Headlamp High-Beam Circuit Open) is: Burned out high-beam bulb or poor bulb socket connection
Typical repair costs for B1568 range from $50 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive during daylight hours, but nighttime driving safety is compromised due to reduced visibility and inability to signal other drivers with high beams. Repair should be completed before extensive night driving, and driving with only low beams in dark rural areas is not recommended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1568 to identify the root cause.
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Quick Info
Category
Body
System
Exterior Lighting System
Difficulty
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