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Home / DTC / B2635 — Failure in the right rear microphone circuit

B2635 — Failure in the right rear microphone circuit

Detailed page for trouble code B2635.

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Code

B2635

LAND ROVER B — Body

Failure in the right rear microphone circuit

Brand: LAND ROVER
Type: B — Body
Views: UK: 7 EN: 15 RU: 7
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Page language: EN

Causes

  • Open or shorted wiring between right rear microphone and infotainment/telephony module
  • Poor or corroded connector at the microphone or module
  • Failed right rear microphone element (electret/MEMS)
  • Faulty infotainment/telephony control module or microphone input driver
  • Water ingress or physical damage to microphone or wiring
  • Software/firmware anomaly or configuration error

Symptoms

  • No audio from right rear microphone (hands-free or voice commands)
  • Reduced voice quality or one-sided pickup
  • Voice recognition failing or reduced accuracy
  • Stored B2635 diagnostic trouble code
  • Intermittent microphone function (works sometimes)

What to check

  • Read fault memory and note freeze-frame data and occurrence count
  • Attempt to reproduce fault (make a call, use voice command) while monitoring DTCs
  • Visual inspection of right rear microphone, mounting and wiring for water damage, chafing or corrosion
  • Check connectors at microphone and at the infotainment/telephony module for corrosion, bent pins or poor mating
  • Check related fuses and power supplies for the infotainment/telephony system
  • Measure voltages and continuity at microphone connector with harness connected and with ignition ON (see signal parameters)

Signal parameters

  • Typical microphone bias/supply voltage at mic connector: ~2.5–5.0 V (varies by system and mic type)
  • Typical DC offset on microphone signal line: ~1.0–3.0 V (system dependent)
  • Typical AC voice signal level produced by mic during speech: ~10–200 mV RMS (may be higher for close talk)
  • Expected continuity between microphone ground and vehicle ground: near 0 Ω
  • Expected DC resistance of microphone element (if specified): typically 1 kΩ–10 kΩ for some microphone types; consult vehicle-specific data

Diagnostic algorithm

  1. Retrieve and record DTCs, then clear codes and re-run test to confirm repeatability.
  2. Verify vehicle software/updates and known technical service bulletins for microphone issues.
  3. Visually inspect the right rear microphone assembly, mounting and harness for moisture, impact damage, or disconnection.
  4. With ignition ON (accessory) backprobe microphone connector at the mic side: check for expected bias/supply voltage and ground reference. Compare to signal parameters.
  5. With a second person speaking near the mic, observe AC signal on oscilloscope or multimeter (AC mV). Confirm presence of voice waveform.
  6. If no bias or signal, trace wiring to the infotainment/telephony module. Check continuity and resistance between mic connector and module connector; inspect for shorts to ground or battery.
  7. Inspect and test intermediate connectors (door seals, roof modules) for intermittent connections by wiggling harness while monitoring signal and DTC status.
  8. If wiring and connectors are good, disconnect microphone and measure microphone element resistance per vehicle specification; or substitute a known-good microphone to confirm.
  9. If a replacement microphone fixes the issue, reassemble and clear codes. If replacement does not fix, test the input at the infotainment/telephony module and consider module repair or replacement.
  10. After repair, perform full function check of hands-free calling and voice systems and confirm DTC does not return.

Likely causes

  • Corroded/loose connector at right rear microphone (common in door/roof area)
  • Broken or shorted wiring (pinched in door, trunk hinge, or body panel)
  • Failed microphone element
  • Fault in infotainment/telephony module input circuit

Fault status

⚠️ Status
Right rear microphone circuit fault detected (open/short/high resistance/intermittent)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B2636 B2634 B2630 U0131 U0100
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Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

Contents
Key sections:
  • 01 INTRODUCTION
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Contents
Key sections:
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Contents
Key sections:
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