B13F1

Code

LAND ROVER B — Body

Assistant - Distribution Motor

Brand: LAND ROVER

Type: B — Body

Views: UK: 14 EN: 24 RU: 20

AI status

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Page language: EN

Causes

Failed distribution/actuator motor
Mechanical binding or seized actuator
Broken or corroded connector or wiring (open, short to ground or battery)
Blown fuse or poor ground
Faulty control module or driver transistor
Loss of CAN/communication or software error

Symptoms

Distribution actuator does not move or moves intermittently
Incorrect airflow direction or stuck vent position
Warning lamp/message for Assistant/HVAC on dash
Unusual noise (grinding or clicking) from actuator area
Related functions respond slowly or not at all

What to check

Read DTCs and freeze frame with a diagnostic tool; note current/historic and accompanying codes
Attempt actuator self-test/bi-directional command from scan tool
Visually inspect actuator, connector and wiring for damage, corrosion, or pin push-out
Check relevant fuses and ground connections
Probe power and ground at actuator connector with ignition on
Check for communication errors on CAN bus if applicable

Signal parameters

Supply voltage at actuator connector with ignition on: should be near battery voltage (~11–14 V)
Switch-ground continuity to appropriate chassis ground
Control signal may be PWM — frequency and duty vary by model; verify with manufacturer data
Feedback/position sensor (if present) should output a variable voltage or resistance within factory specification
Resistance of motor windings should be within service data limits (refer to OEM values)

Diagnostic algorithm

Connect a diagnostic scanner, record DTC details and any related codes or freeze-frame data.
Perform actuator enable test from scanner to observe movement, noise, current draw and feedback response.
Visually inspect actuator and harness. Wiggle test wiring while commanding actuator to check for intermittent opens/shorts.
With connector disconnected, measure supply voltage and ground at the harness side. If absent, trace back to fuse/relay/module.
Measure motor winding resistance and compare to service specification. Back-probe control signal while commanding the actuator to verify PWM or control waveform.
Inspect actuator mechanically for seized gears or linkage binding. Remove actuator if necessary to check free movement.
If wiring and actuator are good, check control module outputs and CAN communication. Replace module or reprogram only after confirming upstream wiring and actuator are good.
Clear codes and retest. If fault returns, replace the defective component per OEM procedures.

Likely causes

Failed motor inside the distribution actuator
Wiring damage at door hinge, seam or harness (intermittent)
Connector corrosion or poor pin contact at the actuator
Actuator gear stripped or linkage binding
Fuse for HVAC/Assistant circuits blown

Fault status

⚠️ Status

The vehicle control module has detected an abnormal condition on the Assistant distribution motor circuit (open, short, overcurrent, or invalid feedback) and stored DTC B13F1. The code may be current (active) or historic; verify with live data and repeat tests before replacing parts.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

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B13F1 — Assistant - Distribution Motor