What Does B1319 Mean?
This code indicates the Body Control Module (BCM) has detected a malfunction in the driver's door ajar switch circuit. The BCM monitors the door ajar switches to determine if doors are open or closed for interior lighting, security systems, and instrument cluster warnings. A circuit failure means the BCM is receiving an incorrect, intermittent, or no signal from the driver's door ajar switch or its associated wiring.
Common Causes
45%
Faulty or misaligned door ajar switch/latch assembly causing intermittent or no contact
30%
Corroded, damaged, or loose wiring/connector at door jamb or latch assembly
15%
Broken or frayed wiring in door harness boot between body and door due to flexing
10%
Failed Body Control Module (BCM) internal circuit or water damage to BCM
Diagnostic Steps
1
Step 1: Visually inspect the driver's door ajar switch location (typically in door latch or jamb) for physical damage, corrosion, misalignment, or debris preventing proper switch operation
2
Step 2: Using a multimeter, backprobe the door ajar switch connector with door open and closed, verifying proper voltage change (typically 0V closed, 5-12V open or vice versa depending on manufacturer logic)
3
Step 3: Inspect door harness boot between body and door for broken wires by flexing harness while monitoring live data on scan tool for intermittent signal changes
4
Step 4: Check continuity and resistance of wiring from door ajar switch connector to BCM connector with harness disconnected, verifying no opens or shorts to ground/power (typically <5 ohms resistance)
5
Step 5: If all wiring and switch test good, perform BCM input test by manually grounding or applying voltage to BCM door ajar input pin and verify BCM recognizes signal change
6
Step 6: Clear codes, cycle door open/closed multiple times, and verify repair by confirming proper interior light operation and no 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 malfunction in the driver's door ajar switch circuit. The BCM monitors the door ajar switches to determine if doors are open or closed for interior lighting, security systems, and instrument cluster warnings. A circuit failure means th...
The most common cause of B1319 (Driver Door Ajar Circuit Failure) is: Faulty or misaligned door ajar switch/latch assembly causing intermittent or no contact
Typical repair costs for B1319 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. This code primarily affects interior lighting, door ajar warnings, and may prevent proper security system operation. Repair at convenience, though persistent interior light drain could discharge battery if left unresolved.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1319 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Electrical System
Difficulty
Type
Manufacturer
Recommended Tools
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