B1A5F

Code

LAND ROVER B — Body

Left engine mirror

Brand: LAND ROVER

Type: B — Body

Views: UK: 13 EN: 34 RU: 19

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring to left mirror
Poor ground or corroded connector at mirror or door harness
Faulty left mirror motor, heater element or position sensor
Failed mirror module/actuator inside assembly
Blown fuse or relay feeding mirror circuit
Loss of communication between mirror module and vehicle network (LIN/CAN)

Symptoms

Left exterior mirror does not adjust (manual or powered)
Mirror will not fold or unfold (if power-folding equipped)
Mirror heater does not function (no demist/defog)
Integrated turn signal or puddle light in mirror non-functional
Clicking or grinding noises from mirror when trying to adjust
One or more diagnostic trouble lamps or messages related to mirror

What to check

Scan vehicle with OEM-level diagnostic tool; record freeze frame and live data from door/body modules
Visually inspect mirror assembly, connector, and wiring harness through door boot for damage or corrosion
Check relevant fuses and relays for continuity and proper operation
Operate mirror functions while monitoring voltage at mirror connector pins (power and ground)
Check LIN/CAN communication status/messages to mirror module with tool
Perform wiggle test on wiring while operating mirror to reproduce fault

Signal parameters

Battery voltage at mirror power pin: nominal 11–14 V with key on/engine running
Ground continuity to chassis: < 1 Ω
Mirror heater resistance (typical): on the order of 1–50 Ω depending on design — verify against OEM spec
Mirror motor stall/operating current: verify against OEM spec (inrush/stall currents higher than running)
LIN/CAN messages: presence of mirror module messages and correct IDs on bus (compare to known-good values)
Position sensor/feedback voltage or resistance: compare to OEM expected values

Diagnostic algorithm

Connect OEM diagnostic tool, read and record B1A5F and any other stored codes. Clear codes and attempt to reproduce; note if code returns.
Attempt mirror operations (adjust, fold, heat) while monitoring diagnostic tool live data for mirror module responses and error counts.
Visually inspect mirror, connector and door boot for damage or corrosion. Repair any physical damage, reseal if water ingress is present.
Check fuses/relays for the mirror circuit and verify power/ground at mirror connector with a multimeter while operating function switches.
If power is present but mirror does not operate, measure motor/heater resistance and current. Replace mirror assembly if actuator or heater is out of spec.
If no power to mirror, trace wiring back through door harness to door control module/BCM. Repair open/shorted wiring or poor ground connections.
If communication faults are present, check LIN/CAN bus integrity, message activity, and connectors. Repair bus faults or reprogram/replace faulty module as required.
After repairs, clear codes and verify all mirror functions operate over multiple cycles and that B1A5F does not return.

Likely causes

Corroded or disconnected door harness connector where wiring passes through door boot
Failed mirror actuator motor (no movement or abnormal noise)
Interrupted power/ground at mirror connector (chafing or broken wire)
Faulty mirror heating element (open circuit) or excessive resistance
Mirror control module not responding on LIN/CAN bus

Fault status

⚠️ Status

Left engine (exterior) mirror fault detected — circuit or module fault affecting left mirror functions.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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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.

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