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Home / DTC / B11AF — Entertainment and entertainment module - mobile phone button

B11AF — Entertainment and entertainment module - mobile phone button

Detailed page for trouble code B11AF.

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Code

B11AF

LAND ROVER B — Body

Entertainment and entertainment module - mobile phone button

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty mobile phone / hands‑free button (mechanical or electrical failure)
  • Damaged wiring or connector (open, short to ground, short to battery, corrosion)
  • Poor ground or power supply to the entertainment module or button circuit
  • Intermittent or lost CAN/bus communication to the infotainment/phone module
  • Software fault in the entertainment module or module needs reprogramming
  • Moisture/contamination in the switch assembly or connector

Symptoms

  • Phone/hands‑free button does not respond or does not initiate calls
  • No hands‑free phone menu or voice call activation from the button
  • Intermittent operation of phone controls
  • Warning or message on infotainment display indicating button fault
  • Possible other infotainment features affected if communication fault exists

What to check

  • Read DTCs and freeze frame data with a factory‑level diagnostic tool; note related U‑codes or body module faults
  • Visually inspect button, bezel and connector for damage, corrosion or contamination
  • Check relevant fuses and battery voltage at the infotainment/module power input
  • Backprobe button connector and measure continuity/voltage while actuating the button
  • Inspect wiring harness for chafing, bends, or previous repair sections
  • Scan CAN/bus activity for errors or lost messages while pressing the button

Signal parameters

  • Switch behavior: closed (continuity) when pressed, open when released — expect near 0 Ω when closed
  • Supply voltage: nominal 12 V (vehicle battery) to module; expected stable supply (≈11–14 V)
  • Logic/line levels vary by design; if button is read via micro input expect pull‑up/pull‑down behaviour (voltage change when pressed)
  • CAN bus idle differential voltages ≈2.5 V per line, differential ~0 V when idle; messages present when button pressed (vehicle specific IDs)
  • Resistance checks: no high resistance or intermittent change when actuating the button

Diagnostic algorithm

  1. Connect a factory‑level scan tool. Read and record all codes and related modules. Note whether code is current, intermittent or historic.
  2. Attempt to reproduce symptom while monitoring live data or CAN messages related to the phone button. Note any missing or corrupt signals.
  3. Visually inspect the button assembly, surrounding trim and connectors. Check for moisture, damage or loose fasteners.
  4. With ignition on, backprobe the button connector. Measure continuity/voltage while pressing the button. Compare to expected behaviour (closed circuit or voltage change).
  5. Inspect and continuity‑check wiring from the button to the infotainment module/steering wheel control module. Wiggle harness to try to reproduce fault.
  6. Check power and ground at the entertainment module. Verify stable battery voltage and good ground connection.
  7. If CAN communication is suspected, check CAN bus integrity and related node responses. Look for other modules reporting communication errors (U‑codes).
  8. Clear DTCs and retest. If the fault returns, perform isolation by substituting known‑good switch/module where practical or disconnecting suspect circuits per wiring diagram.
  9. If diagnostics point to module software or internal fault, check for available software updates or reflash the module per manufacturer procedure. Replace module or switch assembly only after confirming fault location and reprogramming as required.
  10. After repair, clear codes and confirm normal operation and no recurrence.

Likely causes

  • Button contact failure (stuck or no continuity when pressed)
  • Connector pins corroded or pushed back at the steering wheel or fascia
  • Broken/damaged wire in harness to the infotainment module
  • Intermittent CAN bus node causing invalid/missing button messages
  • Module internal failure requiring replacement or reflash

Fault status

⚠️ Status
Entertainment/infotainment module detected an invalid or missing signal from the mobile phone/hands‑free button circuit or associated communication path. The condition may be stored as current, intermittent or historic depending on occurrence.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B11A0 B11A1 B11B0 U0140 U0155 U0073
264

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