B1553

Code

LAND ROVER B — Body

Release of luggage compartment cover - short circuit at battery

Brand: LAND ROVER

Type: B — Body

Views: UK: 18 EN: 25 RU: 21

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Page language: EN

Causes

Wiring damaged and contacting a constant 12V source (short to battery).
Failed or internally shorted release actuator/solenoid.
Corroded or shorted connector at trunk lid hinge area.
Water ingress in connector or actuator causing short.
Failed BCM/BCM driver transistor supplying the release circuit.
Aftermarket equipment or repair routed wiring incorrectly.

Symptoms

Luggage compartment cover/boot release fails to operate or operates continuously.
Fuse for release circuit frequently blows.
Parasitic battery drain or battery discharging when vehicle is off.
Warning message or lamp related to luggage compartment release or body systems.
Intermittent operation of release or release operates without command.

What to check

Read and record all stored and pending DTCs; note freeze-frame data if available.
Visual inspection of trunk lid harness, boot hinge, and connectors for damage, corrosion, and water ingress.
Check relevant fuses and relays for correct rating and condition.
With ignition off, measure voltage at the actuator connector to see if battery voltage is present when it should be off.
Disconnect the actuator/solenoid and see if code clears or if unwanted battery voltage disappears.
Measure coil resistance of actuator (compare to specification or similar known-good part).

Signal parameters

Inactive control signal: near 0 V relative to ground (should NOT show constant battery voltage when off).
Active control signal: switches to battery voltage (approx. 11–14 V) or driver grounds the circuit depending on vehicle design.
Actuator coil resistance (typical reference): low ohms — commonly in the range of a few ohms up to a few tens of ohms (verify with OEM spec).
Actuator current draw when operating: generally under 5 A (verify with OEM spec).
If driver is a low-side switch, the control pin should switch to ground when activated; a short to battery will show permanent battery voltage on that pin.

Diagnostic algorithm

Retrieve and record DTC(s). Clear codes and attempt to re-create fault to confirm persistence.
Visually inspect harness and connector at luggage compartment area (check for chafing at hinges, pinched wires, corrosion, water).
With ignition off, measure voltage at the release actuator connector; if battery voltage present with no activation, suspect short to battery wiring or stuck relay/BCM output.
Disconnect the actuator connector. If constant battery voltage disappears and the DTC clears on re-test, isolate problem to actuator or harness between connector and actuator.
Measure actuator coil resistance and bench-test actuator with fused 12 V supply to check for internal short or stuck mechanism.
If actuator tests good, perform continuity and pin-to-pin insulation checks from actuator connector back to the BCM/relay and to battery feed to locate a short. Pay special attention to wiring through the trunk hinge area.
Check relevant fuses/relays and any power feed circuits for proper routing. Remove any aftermarket added circuits that could be tied to constant battery feed.
If wiring and actuator are good, test BCM output driver with diagnostic tool or scope; if driver is supplying battery when it should not, consider BCM repair/replacement per OEM procedures.
After repair, clear codes and perform function test several cycles and check for parasitic draw to confirm repair.

Likely causes

Wiring harness chafed at trunk hinge shorting to constant battery feed.
Connector corrosion or water contamination at luggage compartment connector.
Internal short in the release actuator/solenoid.
Faulty body control module (driver stage) stuck feeding battery to the circuit.

Fault status

⚠️ Status

Control module reports a short to battery on the luggage compartment cover release circuit. Circuit is being fed battery voltage when it should be inactive; system may be disabled to protect wiring and battery.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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B1553 — Release of luggage compartment cover - short circuit at battery