B1495

Code

ALFA ROMEO B — Body

Tailgate anti-theft sensor circuit

Brand: ALFA ROMEO

Type: B — Body

Views: UK: 5 EN: 11 RU: 6

AI status

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Page language: EN

Causes

Open or short in the tailgate sensor wiring harness
Corroded, bent or disconnected tailgate sensor connector/pins
Failed tailgate anti-theft sensor / switch
Water ingress or mechanical damage to tailgate latch area
Faulty Body Control Module (BCM) or alarm module input
Related blown fuse, poor ground or power supply issue

Symptoms

Tailgate/boot anti-theft alarm warnings or false alarms
Tailgate open / anti-theft warning message on instrument cluster
Central locking or alarm may not arm or may indicate fault
Interior light or boot lamp may remain on
Stored B1495 fault in diagnostic trouble codes list
Intermittent operation of tailgate lock/actuator

What to check

Read and record all stored DTCs and freeze frame data with a scan tool; note if B1495 is active or historic
Visual inspection of tailgate latch area, sensor connector, and wiring harness for damage, corrosion, or water
Check related fuses and grounds for continuity and proper voltage
With ignition on, observe live data for the tailgate anti-theft sensor input using a diagnostic tool while operating the tailgate
Wiggle test the harness while monitoring the signal to reproduce the fault
Consult vehicle wiring diagram to identify pinout and expected behavior of the sensor circuit

Signal parameters

Sensor type: typically a digital switch (closed/open) or a low-voltage sensor input to BCM; consult wiring diagram for specific type
Typical idle/closed impedance: closed = near 0 ohms to ground (or low resistance), open = high resistance (>10 kΩ) — verify against OEM spec
Typical voltages: sensor circuit may be pulled to battery (approx. 11–13 V) in one state and near 0 V in the other. Confirm exact expected voltage with manufacturer data
Intermittent or rapidly changing voltage suggests wiring break or intermittent connector
If sensor is Hall/accelerometer type, signal may be a low-voltage pulse or CAN/serial message — check module data rather than simple voltages

Diagnostic algorithm

Retrieve and record all codes and live data with a capable diagnostic scanner. Clear codes and attempt to reproduce B1495.
Perform a visual inspection of the tailgate latch, sensor, connector and harness entry into the tailgate. Look for corrosion, stretched or broken wires where the harness flexes.
Check fuses and common ground points related to the BCM/alarm circuits. Repair any bad grounds or blown fuses.
Backprobe the sensor connector at the tailgate with ignition ON. Measure voltage and/or resistance while operating the latch/tailgate. Compare to expected values from wiring diagram.
If the sensor uses a simple switch: check continuity between the sensor terminal and chassis ground (or module input) in both latch positions. Replace the sensor if readings are out of spec.
If intermittent: perform a wiggle test on the wiring from tailgate to body while monitoring the input. Inspect/replace any damaged section of harness or repair connector pins.
If wiring and sensor test good at the tailgate, check continuity from the sensor connector to the BCM input connector in the body. Repair any open/shorts.
If wiring and sensor are good but error persists, verify BCM input operation. Reflash/update BCM software if a known issue exists and consider module replacement only after other causes are eliminated.
After repairs, clear codes, cycle ignition and operating conditions, and verify the fault does not return. Document repair and advise re-test after road/test cycle where appropriate.

Likely causes

Corroded or disconnected connector at the tailgate latch (most common)
Broken wiring or chafed conductor in the tailgate harness where it flexes
Failed sensor/switch inside the tailgate latch
Intermittent connector due to water intrusion
Less likely: BCM input failure or missing fuse

Fault status

⚠️ Status

B1495 - Tailgate anti-theft sensor circuit — electrical fault detected on the tailgate/boot anti-theft input (open, short, intermittent or invalid signal).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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