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Home / DTC / B2312 — Horizontal sensor in passenger mirror - circuit failure

B2312 — Horizontal sensor in passenger mirror - circuit failure

Detailed page for trouble code B2312.

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Code

B2312

LAND ROVER B — Body

Horizontal sensor in passenger mirror - circuit failure

Brand: LAND ROVER
Type: B — Body
Views: UK: 10 EN: 22 RU: 14
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Page language: EN

Causes

  • Damaged or disconnected wiring between mirror and body control module (BCM)
  • Corroded or loose mirror connector or pins
  • Failed horizontal position sensor inside passenger mirror assembly
  • Faulty mirror motor/module or internal wiring harness
  • Water ingress or contamination inside mirror housing
  • Faulty BCM or related module input (less common)

Symptoms

  • Passenger mirror does not move horizontally or moves erratically
  • Mirror memory/automatic positioning for passenger side not working
  • Mirror position displays wrong or fails to calibrate
  • Stored DTCs related to passenger mirror or BCM inputs
  • Possible neutral or intermittent operation of mirror heating or folding (if integrated)

What to check

  • Read and record fault codes with a compatible scan tool and clear codes to see if fault returns
  • Visual inspection of mirror housing, seals, and external wiring for damage or water ingress
  • Inspect door hinge/boot flex conduit and mirror connector for pin corrosion or broken wires
  • Check for stored related events or freeze frame data in BCM
  • Attempt mirror movement commands from switch and observe response
  • Wiggle test wiring while commanding mirror and monitor for intermittent faults

Signal parameters

  • Sensor output: typically a variable voltage or potentiometer signal varying with mirror position (commonly 0–5 V range)
  • Reference supply: 5 V or vehicle-specific reference supplied from BCM
  • Ground: chassis ground continuity required
  • Signal should change smoothly through range when mirror is moved; intermittent or no change indicates wiring or sensor fault

Diagnostic algorithm

  1. Connect a diagnostic tool and confirm B2312 and any related codes. Note freeze frame and live data.
  2. Clear codes and attempt to reproduce by commanding passenger mirror horizontal movement; observe live sensor value and any fault reappearance.
  3. Perform a thorough visual inspection of the passenger mirror, connector, and door wiring (flex conduit). Look for pin damage, corrosion, broken wires or evidence of water intrusion.
  4. With ignition on, backprobe the mirror connector: verify reference voltage, ground continuity and sensor output while operating the mirror. Compare to expected smooth change.
  5. If no reference or ground, trace and repair wiring to BCM or intermediate junctions. Check continuity and for shorts to power/ground.
  6. If wiring and power/ground are good but sensor signal is absent or erratic, remove mirror assembly and inspect internal connector and harness. If available, measure internal sensor resistance or output per service manual.
  7. If internal fault suspected, replace passenger mirror assembly or sensor module. Use known-good unit if possible for confirmation.
  8. After repair or replacement, reprogram/calibrate mirror if required by manufacturer procedures, clear codes and verify removal of DTC and correct operation over a road test or multiple cycles.
  9. If fault persists despite good mirror and harness, investigate BCM input circuitry and software; consult manufacturer technical service information.

Likely causes

  • Broken/shorted wire at mirror hinge or door jamb (common due to flexing)
  • Corroded connector at the mirror or door wiring harness
  • Defective mirror position sensor or mirror module
  • Water damage inside mirror due to seal failure

Fault status

⚠️ Status
Passenger mirror horizontal position sensor circuit failure — inspect mirror wiring, connector and sensor.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B2310 B2311 B2313 B1212
160

Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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