What Does B1576 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the parking lamp input circuit. The BCM monitors the park lamp switch signal and has determined that no voltage or continuity is present when expected, suggesting a break in the wiring, a faulty switch, or a poor ground connection. This prevents the BCM from receiving proper input about the parking lamp position request.
Common Causes
40%
Open or damaged wiring between park lamp switch and BCM, including corroded connectors or broken wires
30%
Faulty park lamp switch with internal open circuit or poor contact
20%
Poor ground connection at BCM or park lamp circuit ground point
10%
Failed Body Control Module with damaged input circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of park lamp switch and BCM connectors for corrosion, pushed-back pins, or physical damage. Check all visible wiring for chafing, cuts, or signs of rodent damage along the harness routing.
2
Step 2: Using a digital multimeter, backprobe the park lamp switch output terminal with ignition on and switch in park position. Verify proper voltage signal (typically battery voltage or 5V reference depending on manufacturer) is present at the switch output.
3
Step 3: With multimeter in continuity mode, test continuity from the park lamp switch output terminal to the corresponding BCM input pin with switch activated. Resistance should be less than 5 ohms; infinite resistance confirms open circuit in harness.
4
Step 4: Test park lamp circuit ground by measuring voltage drop between BCM ground and battery negative with park lamps commanded on. Voltage drop should be less than 0.1V; higher readings indicate poor ground connection.
5
Step 5: If all wiring and grounds test good, substitute a known-good park lamp switch and retest. If code persists, suspect BCM internal circuit failure and verify all other BCM functions before replacement.
6
Step 6: After repair, clear codes, cycle park lamp switch through all positions multiple times, and perform a test drive with park lamps on to verify no code recurrence.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the parking lamp input circuit. The BCM monitors the park lamp switch signal and has determined that no voltage or continuity is present when expected, suggesting a break in the wiring, a faulty switch, or a poor groun...
The most common cause of B1576 (Lamp Park Input Circuit Open) is: Open or damaged wiring between park lamp switch and BCM, including corroded connectors or broken wires
Typical repair costs for B1576 range from $75 to $450, 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 parking lamps may not function properly which reduces visibility to other drivers in low-light conditions. Repair should be completed before regular nighttime driving to ensure proper vehicle lighting for safety.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1576 to identify the root cause.
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Quick Info
Category
Body
System
Exterior Lighting System
Difficulty
Type
Manufacturer
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