B1327

Code

LAND ROVER B — Body

Passenger door ajar - circuit failure

Brand: LAND ROVER

Type: B — Body

Views: UK: 22 EN: 40 RU: 31

AI status

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Page language: EN

Causes

Damaged or broken wiring in the door hinge/collar (flex) harness
Corroded or loose connector at the door latch or body harness
Faulty door latch micro‑switch or reed/magnetic sensor
Poor ground or power supply to the door module or BCM
Water ingress or corrosion inside the latch or connector
Faulty body control module (less common) or software glitch

Symptoms

Passenger door ajar warning lamp or message on dash
Interior lights or dome lamp staying on or switching erroneously
Door ajar chime or repeated audible warnings
Vehicle will not lock/arm the alarm or remote locking behaves inconsistently
Battery drain if light or circuit remains energized
Inconsistent or intermittent fault — may clear while driving then return

What to check

Read stored DTCs and freeze frame data; note when the code sets (door open/closed, driving, parked)
Perform a visual inspection of the passenger door latch, switch, and wiring harness through the door jamb flex conduit
Inspect and wiggle the harness while watching live data to reproduce the fault
Check connector pins for corrosion, bent pins, water, or signs of overheating
Verify fuses and module power/ground circuits for proper voltage and continuity
Use a scan tool to view the door ajar input state and compare with the physical door position

Signal parameters

Body control module supply voltage: typically ~11–14.5 V with ignition on
Door ajar switch voltage: depending on vehicle wiring, expect either near 0 V (grounded when closed) or battery voltage (~12 V) when open — consult vehicle wiring diagram
Closed switch continuity: typically low resistance (
Open switch resistance: very high (kΩ to open/infinite) when circuit is open
Intermittent readings or rapidly changing voltage when harness is flexed indicate wiring break or intermittent connector

Diagnostic algorithm

Confirm the code and note any additional body/network codes. Attempt to recreate the condition (open/close passenger door while monitoring live data).
Visual inspection: open door, inspect latch, switch, and flex harness for chafing, broken wires, or visible corrosion at connectors.
With door closed and ignition on, monitor the door ajar input on a scan tool and observe changes while operating the latch and flexing the harness.
Backprobe the connector at the latch/door switch: verify reference/pull‑up voltage and switch operation. With the switch actuated, check for expected change in voltage or continuity to ground per wiring diagram.
Perform continuity check from the latch connector to the body harness/BCM connector with door open and closed. Look for shorts to ground or battery and for opens. Wiggle harness at the hinge to detect intermittent faults.
If suspect connector corrosion or damaged pins, disconnect, inspect, clean or repair terminals, then recheck. Use dielectric grease after cleaning where appropriate.
If wiring and switch check good, test ground(s) and supply to the associated module. Repair any poor grounds or power faults.
If harness and switch are good and the signal is correct at the latch but the module still reports the fault, check the BCM/door module communications and consider module replacement only after confirming wiring and connectors.
Clear codes and road/test to confirm repair. Monitor for return of B1327 and verify proper operation of locks, chimes, and interior lighting.

Likely causes

Frayed wires in the door jamb flex conduit caused by repeated door opening/closing
Corroded multi‑pin connector at the latch or door A-pillar connector
Failed latch switch due to moisture or mechanical wear
Intermittent contact from a dirty or bent pin in the female/male connector
Short to chassis or short to battery on the ajar signal wire

Fault status

⚠️ Status

B1327 — Passenger door ajar circuit failure detected by BCM. Open/short/intermittent signal from passenger door ajar/latch switch.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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B1327 — Passenger door ajar - circuit failure