B1078

Code

LAND ROVER B — Body

Convertible top latch sensor

Brand: LAND ROVER

Type: B — Body

Views: UK: 21 EN: 37 RU: 19

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Page language: EN

Causes

Failed latch position sensor (open/short or internal failure)
Corroded or loose connector at the latch or control module
Damaged wiring harness (chafing, broken conductor, water ingress)
Mechanical latch binding, misalignment or obstruction
Blown fuse or faulty relay supplying the latch/sensor
Faulty body/convenience control module or software error

Symptoms

Convertible top will not stow or deploy or stops mid-cycle
Driver information message or warning lamp about the roof/latch
Top appears unlocked when it should be locked (or vice versa)
Audible clicking/attempt but no movement at latch
Intermittent operation of convertible top or only working after manual manipulation

What to check

Scan vehicle and confirm B1078 plus any related DTCs; record freeze-frame/live-data while operating top
Visually inspect latch, sensor and connector for corrosion, water, damage or foreign objects
Check fuses and relays for the convertible-top circuit
Backprobe latch sensor connector with top operated; observe signal changes and reference voltage
Perform continuity/resistance check from sensor connector to control module; wiggle wiring to replicate fault
Check latch mechanical movement and alignment; lubricate and free any binding components

Signal parameters

Sensor type varies by model: commonly a simple position switch or hall effect sensor
Reference supply typically 5 V (logic) or switched 12 V — consult vehicle manual before testing
Latched (closed) often reads near 0 V (ground) or a low resistance; unlatched often shows reference voltage or open circuit
Expected supply voltage: approx. 11–14 V for 12 V supply circuits; reference 5 V for logic circuits
Open-circuit resistance may read as infinite (O.L.); closed switch resistance typically

Diagnostic algorithm

Retrieve and record DTCs and vehicle information. Note any other roof or body DTCs.
Visually inspect latch area and connector for corrosion, loose pins, water contamination, or physical damage.
With a diagnostic tool connected, command the roof cycle while watching live data for latch position sensor state changes.
Backprobe the sensor connector: verify reference voltage (if present), ground return and signal transition when latch moves. Compare to expected values in manufacturer data.
If no signal change, unplug connector and check for continuity between sensor body/terminals and control module harness; wiggle test for intermittent faults.
Measure sensor resistance (if switch-type) or voltage output (if active sensor). Replace sensor if readings are outside spec or inconsistent.
Inspect and repair any damaged wiring or replace corroded connectors. Protect repaired areas from moisture ingress.
Verify latch mechanical operation: free, adjust or replace latch if it physically cannot reach the correct position to trigger the sensor.
After repairs, clear codes and perform multiple roof cycles to confirm proper operation and that no DTCs return.
If wiring and sensor check good but fault persists, consider module-level diagnostics or software updates per dealer procedures.

Likely causes

Sensor failure at the latch
Connector corrosion or water intrusion at the latch
Wiring open/short between latch and control module
Latch mechanical binding preventing correct sensor operation

Fault status

⚠️ Status

Latch position sensor circuit fault detected — control module not receiving expected latch open/closed signal; convertible-top operation may be inhibited and a warning message displayed.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Manual library for LAND ROVER

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Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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