What Does B1563 Mean?
This code indicates the Body Control Module (BCM) has detected a malfunction in the door ajar monitoring circuit. The BCM continuously monitors door position switches to determine if any doors are open, and this code sets when the circuit voltage or signal is outside expected parameters. This can result in interior lights staying on, warning chimes, or false door-open warnings on the instrument cluster.
Common Causes
45%
Faulty or misaligned door latch switch/sensor causing intermittent or permanent open circuit
30%
Corroded, damaged, or loose wiring connector at door jamb switch
15%
Damaged or chafed wiring in door jamb area from repeated opening/closing cycles
10%
Failed Body Control Module (BCM) internal circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of all door jamb switches for physical damage, misalignment, or corrosion. Check each door switch connector for moisture intrusion, bent pins, or loose connections.
2
Step 2: Using a digital multimeter, test each door jamb switch for proper resistance and continuity. With door closed, expect continuity to ground or voltage signal (vehicle-specific). With door open, signal should change state.
3
Step 3: Inspect wiring harness in door hinge area for chafing, breaks, or pinched wires. Flex harness while monitoring live data on scan tool to identify intermittent opens or shorts.
4
Step 4: Monitor BCM door ajar input signal using scan tool live data while manually operating each door switch. Identify which specific door circuit is reporting fault or stuck signal.
5
Step 5: If all switches and wiring test good, check for water damage or corrosion at BCM connector pins related to door circuits. Measure voltage at BCM connector with harness disconnected to verify circuit integrity.
6
Step 6: Clear codes, operate all doors through full cycles, and verify repair by monitoring for code return and proper door ajar indicator function on instrument cluster.
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a malfunction in the door ajar monitoring circuit. The BCM continuously monitors door position switches to determine if any doors are open, and this code sets when the circuit voltage or signal is outside expected parameters. This can re...
The most common cause of B1563 (Door Ajar Circuit Failure) is: Faulty or misaligned door latch switch/sensor causing intermittent or permanent open circuit
Typical repair costs for B1563 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with this code. Primary concerns are interior lights draining battery if staying on continuously, and potential missed warning if a door is actually ajar while driving. Repair at convenience but address promptly to prevent battery discharge.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1563 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Convenience Systems
Difficulty
Type
Manufacturer
Recommended Tools
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