Code
B1327
Other
B — Body
Passenger Door Ajar Circuit Failure
AI status
Completed
Completed
100%
Causes
- Open or short in the passenger door ajar switch wiring
- Corroded or disconnected door harness connector or terminal
- Faulty passenger door ajar (pin/switch) sensor
- Water intrusion or mechanical damage in the door/switch area
- Poor or missing ground at the door or BCM
- Faulty body control module or input circuit
Symptoms
- Door ajar indicator lamp or message for passenger door
- Interior courtesy lights staying on or not turning off correctly
- Opening/closing chime or incorrect chime behavior
- Central locking may not function correctly for that door
- Parasitic battery drain if lights remain on
- Door status incorrect in gauge cluster or infotainment
What to check
- Read stored and pending codes and freeze-frame data with a scanner
- Visually inspect door wiring harness at hinge boot for damage
- Inspect connector pins for corrosion, bent pins, or missing terminals
- Operate the passenger door latch/switch by hand and watch scanner for status changes
- Check fuses related to BCM/door circuits
- Measure voltage and continuity of the switch circuit with key on/engine off
Signal parameters
- Typical closed-switch voltage: near 0–1 V if switch is grounded when closed (may vary by manufacturer)
- Typical open-switch voltage: approx. 9–14 V if circuit is pulled up to battery by BCM or resistor
- Closed-switch resistance: low (near 0–5 ohms) across switch when actuated; open = OL (infinite)
- Expected BCM input behavior: stable logic transition when switch is actuated; no rapid toggling
- Intermittent or fluctuating voltage indicates a wiring/connector issue
Diagnostic algorithm
- Verify the code with a scan tool, note freeze frame and occurrence counts; clear codes and attempt to reproduce.
- Confirm symptom: use scan tool to monitor 'passenger door ajar' status while opening/closing the door slowly.
- Visually inspect the door jamb harness, boot, and connectors for damage, corrosion, or water entry. Repair visible damage.
- With connector disconnected, check continuity of the switch circuit between the door switch terminal and the BCM input pin; repair any open.
- With harness connected, backprobe the switch signal at the BCM connector. Operate the latch/switch and confirm the expected voltage changes (see signal parameters).
- Check for unintended short to power or ground by measuring voltage with door in both states and wiggle the harness through full travel. Isolate and repair any shorted conductors.
- Inspect and test ground points used by the door module/switch. Clean and secure grounds as needed.
- If wiring and switch test good, bench-test or replace the passenger door latch/switch assembly and retest.
- If switch and wiring are verified good and symptoms persist, consider BCM input fault: verify other BCM functions, check for software updates, and consult manufacturer procedures before replacing BCM.
- After repairs, clear codes and perform a road/usage test to ensure the fault does not recur.
Likely causes
- Broken or chafed wire at the hinge/boot between door and body
- Corroded connector pins on the door harness or BCM connector
- Door latch/switch mechanical failure (sticking or broken plunger)
- Intermittent short to power or ground when door moves
- Failed BCM input stage (less common)
Fault status
Status
Passenger door ajar circuit failure — the BCM detected an open, short, or invalid signal from the passenger door open/closed switch circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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