B13E7

Code

LAND ROVER B — Body

Microphone 4

Brand: LAND ROVER

Type: B — Body

Views: UK: 14 EN: 31 RU: 19

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Page language: EN

Causes

Damaged or disconnected microphone element (Microphone 4)
Faulty microphone ground or supply circuit
Open, short or high resistance in microphone wiring or connector
Corroded/poor connector pin contact at microphone or module
Faulty body control / infotainment module input circuit
Software/configuration issue or missing microphone assignment

Symptoms

Hands‑free microphone not working for caller audio
Poor voice recognition or reduced microphone sensitivity
Intermittent microphone operation (cuts in/out)
System displays microphone fault or mutes microphone input
Background noise, distortion or echo from hands‑free calls

What to check

Read vehicle modules and retrieve freeze frame/live data for B13E7 and any related codes
Visually inspect microphone location (headliner/A‑pillar/dash) for damage, water stains or loose fit
Inspect wiring harness and connector for corrosion, pin damage, pushed‑out terminals or signs of water intrusion
Confirm microphone is present for position 4 (factory fitment may vary by model/trim)
Check for additional body/infotainment codes (CAN bus or audio module faults)
Attempt to reproduce fault while observing live data or microphone status in the infotainment diagnostic screen

Signal parameters

Microphone bias/supply voltage (if active mic): typically ~2–5 V (check vehicle-specific spec)
Microphone DC resistance/impedance: commonly a few hundred ohms to a few kiloohms depending on mic type
Wiring continuity: near 0 Ω for short runs, no open circuits; >10 kΩ indicates open/high resistance
CAN/infotainment module: microphone status messages should be present on audio bus (vehicle specific)

Diagnostic algorithm

Confirm the DTC with appropriate diagnostic tool and note any associated codes or freeze frame data.
Inspect microphone 4 location and connector for physical damage, moisture, or loose fit; repair or reseat as needed.
With ignition on, backprobe microphone connector: measure supply/bias voltage and ground reference per vehicle spec; compare to expected range.
Check continuity between microphone connector and audio/body module; inspect for short to ground or to other circuits.
If passive mic, measure DC resistance/impedance of the microphone element (expect manufacturer range); if out of range, replace microphone.
If active (powered) microphone and supply voltage is missing or out of range, trace power/ground circuits and check relevant fuses/relays.
If wiring and microphone test good, swap microphone 4 with another known-good microphone location (if accessible and compatible) to see if fault follows the harness or the microphone.
If fault remains at module input after harness and microphone verified good, check module grounds and software/calibration; perform module reprogramming or update if technical service bulletins recommend.
Clear DTCs and perform a functional test (hands‑free call/voice recognition) and a road test if required to confirm repair.
If intermittent or unclear, consider installing a new replacement microphone and retest before module replacement.

Likely causes

Broken/disconnected wiring or pin at microphone connector
Failed microphone element (internal short/open)
Corroded connector or poor ground at microphone
Module input fault or incorrect software/calibration

Fault status

⚠️ Status

Microphone 4 — Circuit/Input Fault detected by audio/body module; microphone input out of expected range or not responding.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–1.5 hours

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Repair manuals

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