B144F

Code

LAND ROVER B — Body

foldable attacker power supply circuit control module - Ignition source of the engine compartment 3

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 26 RU: 13

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Page language: EN

Causes

Blown fuse or faulty circuit breaker for the engine-compartment ignition-switched supply
Faulty ignition relay or ignition switch contact feeding engine-compartment ignition source 3
Open, corroded, disconnected or damaged wiring or connector between the ignition source and the foldable actuator control module
Short to ground or to permanent battery voltage on the ignition-switched feed
Faulty foldable actuator control module (internal power supply or input circuitry)
Intermittent or poor ground for the control module causing false supply readings

Symptoms

Foldable actuator(s) (mirrors/antenna/roof component depending on vehicle) not operating or intermittent operation
Stored body control module / foldable actuator control module DTCs (including B144F)
Accessory does not power up with ignition in the RUN/ACC position
Possible parasitic battery drain if the circuit is shorted to battery
No obvious fault in mechanical components when electrical supply is absent

What to check

Verify exact component(s) referenced by the code in the vehicle service manual (which foldable actuator and which control module)
Visually inspect fuses and related relays for the engine-compartment ignition-switched supply #3
Inspect wiring harness and connectors from ignition source to the control module for damage, corrosion, or poor pin retention
Check for stored related codes in other modules (body, BCM, IPC) to identify upstream faults
Measure voltage at the control module power pin with ignition OFF and ON
Measure resistance/continuity from the control module power pin back to the fuse/relay output

Signal parameters

Ignition OFF: supply pin ~ 0 V (or battery voltage only if circuit is unintendedly tied to battery — indicates short)
Ignition ON/RUN or ACC: supply pin expected ~ 11–14.5 V (battery voltage under normal operating conditions)
Open-circuit: very high resistance / infinite between fuse output and module power pin
Short-to-ground: near 0 Ω between module power pin and chassis ground
Short-to-battery: near 0 Ω between module power pin and battery positive (constant feed) when ignition OFF

Diagnostic algorithm

Retrieve freeze frame and full stored code list from all modules. Note which ignition positions trigger the code.
Identify exact fuse/relay and wiring harness for ‘engine-compartment ignition source 3’ from the factory wiring diagram.
Visually inspect the fuse, relay, harness routing and both ends of the connector at the control module for obvious damage, corrosion or loosened pins.
With a digital multimeter, measure voltage at the control module power pin: verify ~0 V with ignition OFF and ~12–14 V with ignition ON. Record results.
If voltage is incorrect, test continuity between the control module power pin and the fuse/relay output. Repair any open/high-resistance connections.
If fuse blows or voltage drops under load, isolate short by disconnecting downstream connectors and rechecking; inspect harness for chafing or pinched wiring.
Check operation of the related ignition relay and ignition switch feed; substitute a known-good relay if needed and re-test.
Verify good ground(s) for the control module — measure voltage drop while operating the circuit.
If wiring and external components test good, follow manufacturer procedure to test or replace the foldable actuator control module. Reprogram/initialize if required after replacement.
Clear codes and confirm proper operation through multiple ignition cycles and functional tests; perform a wiggle/intermittency test to ensure repair is successful.

Likely causes

Blown fuse protecting the engine-compartment ignition source 3
Loose or corroded connector at the control module power pin
Damaged harness (chafing, rodent damage) in engine bay where wiring routes
Failed ignition relay or degraded ignition switch contact
Control module internal failure

Fault status

⚠️ Status

B144F — Foldable actuator power supply circuit (control module) — Engine compartment ignition source 3: expected ignition-switched feed missing, shorted, open or intermittent.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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B144F — foldable attacker power supply circuit control module - Ignition source of the engine compartment 3