B1C16

Code

LAND ROVER B — Body

Feedback circuit of the left mirror motor right of the passenger

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 25 RU: 20

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Page language: EN

Causes

Open or short in the mirror feedback wiring harness
Corroded or loose connector at the mirror or door module
Failed mirror motor feedback sensor (potentiometer/Hall sensor)
Water ingress or contamination inside mirror housing
Poor ground or supply (fused power fault)
Faulty door or mirror control module/software fault

Symptoms

Mirror does not adjust or moves erratically
Mirror position does not hold or returns incorrect position
Intermittent mirror function (works after moving door/connector)
Related mirror or door module DTCs present
Possible audible motor noise without movement

What to check

Read and record all stored and pending DTCs and freeze-frame data with OEM-level scan tool
Visually inspect mirror housing, connector and door harness for corrosion, damage or water ingress
Check related fuses and relays for continuity and correct rating
Operate mirror switches while watching connector and mirror for movement
Wiggle test harness at door hinge while operating mirror to reproduce fault

Signal parameters

Mirror supply voltage (key on, motor inactive): ~11–13 V (vehicle battery supply)
Feedback signal (position): typically a variable voltage ~0.5–4.5 V or resistance 0–5 kΩ depending on model (refer to OEM spec)
Motor move current draw when operating: commonly 0.5–3 A peak
Feedback signal may be PWM or analogue depending on vehicle; confirm with manufacturer data

Diagnostic algorithm

Verify B1C16 is present; record any additional mirror/door module codes and freeze-frame data.
Visually inspect external mirror, housing and connector for damage, corrosion or water. Repair/replace obvious faults.
Check related fuses and vehicle ground points for security and corrosion; repair as needed.
With ignition ON, backprobe the mirror connector: confirm constant battery supply and ground presence; compare to expected voltages.
Command mirror movement using scan tool or switch while observing feedback signal at the connector. Note if feedback voltage changes smoothly with movement.
Perform wiggle test at door hinge and connector while monitoring signal to find intermittent breaks.
If feedback is open or shorted: measure continuity between mirror connector pins and door module pins; isolate and repair harness break or short to ground/power.
If wiring is good but feedback signal is incorrect, remove mirror glass/assembly and measure internal feedback sensor (resistance or voltage) per OEM procedure; replace mirror motor/assembly if sensor failed.
If mirror and wiring test good, check door/mirror control module outputs and CAN communications; reflash/update module software if indicated.
After repair, clear codes and perform function tests and a full operational test cycle to confirm fault does not return.

Likely causes

Broken wire in the door jamb (flex area)
Corroded pins at mirror connector allowing intermittent contact
Failed feedback potentiometer or Hall sensor inside mirror motor assembly
Water-damaged mirror assembly
Faulty ground at mirror or door module

Fault status

⚠️ Status

Feedback circuit fault for left mirror motor reported (passenger‑side/right circuit); open/short/intermittent feedback signal.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–2.5 hours

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