B1D64

Code

LAND ROVER B — Body

Circuit of the left headlight rotating motor

Brand: LAND ROVER

Type: B — Body

Views: UK: 13 EN: 18 RU: 8

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Page language: EN

Causes

Open or short in the left headlight rotating motor wiring (power or ground)
Corroded, loose or damaged connector at the headlight motor
Failed left headlight rotating motor (internal motor or gearbox fault)
Faulty fuse or relay feeding the headlight motor circuit
Water ingress or contamination in headlamp assembly
Faulty body control/headlamp control module or software fault

Symptoms

Left headlight does not rotate/adjust when vehicle or system commands aim change
Adaptive headlight or aim fault warning/message in instrument cluster
Asymmetric beam pattern between left and right headlights
DTC B1D64 stored in diagnostic memory
Intermittent operation or flicker of left headlight rotation

What to check

Connect a diagnostic scanner and read/record all related fault codes and freeze-frame data
Visually inspect left headlamp assembly, connector and wiring for damage, corrosion or water ingress
Check relevant fuses and relays for continuity and correct operation
Verify module communications (CAN/ LIN) and ensure no bus errors affecting headlamp control
Backprobe the motor connector to check for battery voltage and ground presence with command active
Measure motor winding resistance and compare to expected (low ohms) to detect open or short

Signal parameters

Supply voltage: near battery voltage (approx. 11–14 V) at motor power pin when motor is commanded
Ground: low-resistance path to chassis ground; near 0 Ω continuity to battery negative
Control signal: may be switched battery or PWM from control module — should change when motor commanded
Motor winding resistance: low value (typical small DC motor range e.g., single-digit to tens of ohms); open = infinite, short to chassis = near 0 Ω to ground
Current draw: increases when motor is under load; very high current suggests seized motor (compare to specification if available)

Diagnostic algorithm

Use a scan tool to confirm B1D64, record any related codes, clear codes and attempt a self-test or re-command of the left headlight rotation.
Perform a careful visual inspection of the left headlamp, connector, and harness for damage, corrosion, water ingress or signs of mechanical interference.
Verify fuses/relays powering the headlamp motor; replace any blown fuses and retest.
With ignition on, backprobe the headlamp motor connector: check for battery voltage on the supply circuit and a good ground while commanding the motor from the scan tool. Observe any change in voltage or PWM when commanded.
Measure the DC resistance of the motor windings with the connector disconnected. An open circuit indicates a failed motor; very low or near short to ground indicates internal short.
If the motor does not receive proper supply or ground, trace the wiring back to the next connector and module; repair any open or shorted wires and repair corroded connectors.
Bench-test the motor by applying appropriate battery voltage to confirm motor operation (use caution, support motor assembly securely). Replace motor if it fails to run or draws excessive current.
If wiring and motor check good, verify the headlamp/body control module outputs and reflash/update software if manufacturer bulletins apply. Replace module only after confirming module fault.
After repairs, clear codes and verify correct operation of headlight rotation through multiple cycles and road/ignition states.

Likely causes

Corroded/loose connector or wiring at left headlight (most common)
Failed rotating motor inside left headlamp
Open/shorted power or ground conductors to the motor
Damaged harness from impact or chafing allowing intermittent contact
Control module output or communication fault (less common)

Fault status

⚠️ Status

Left headlight rotating motor circuit fault — possible open, short or poor connection in supply, ground, or control signal to left headlamp motor.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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