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Home / DTC / B116D — SOS on the call keyboard

B116D — SOS on the call keyboard

Detailed page for trouble code B116D.

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Code

B116D

LAND ROVER B — Body

SOS on the call keyboard

Brand: LAND ROVER
Type: B — Body
Views: UK: 12 EN: 18 RU: 15
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Page language: EN

Causes

  • Open, short or intermittent wiring between SOS button and telematics module
  • Corroded or loose connector at the SOS button, overhead module or telematics unit
  • Blown fuse or inadequate battery supply to the telematics/emergency module
  • Faulty SOS (call) button or call keyboard assembly
  • Faulty telematics / eCall module or internal software error
  • CAN/LIN communication fault between the call keyboard and telematics/infotainment module

Symptoms

  • SOS/emergency-call indicator or message displayed in the instrument cluster or infotainment
  • Pressing the SOS button does nothing or does not establish a call
  • Stored B116D (and possibly related telematics/communication) DTCs present
  • Intermittent operation of SOS button or multiple related body electrical faults
  • Possible warning chimes or notifications about telematics service

What to check

  • Read and record all related DTCs and freeze-frame data with a compatible diagnostic tool (manufacturer scanner recommended)
  • Check for any relevant Technical Service Bulletins (TSBs) or software updates for telematics/eCall
  • Visually inspect roof console, SOS button, wiring harness and connectors for corrosion, damage or water ingress
  • Verify vehicle battery voltage and telematics module supply fuse(s)
  • Check continuity and resistance of SOS button switch circuit (open/closed values)
  • Verify CAN/LIN communication and normal bus voltages with a scope or multimeter

Signal parameters

  • Telematics module supply voltage: approx. battery voltage (12 V nominal) with ignition/required wake state
  • Ground: good chassis ground continuity at module and button assembly
  • CAN bus idle voltages: CAN High ≈ 2.5 V, CAN Low ≈ 2.5 V (verify differential activity during communication)
  • Switch resistance: SOS button closed ≈ near 0 Ω (manufacturer spec may vary); open = high/OL
  • Wake/sleep current: telematics module current draw should match OEM spec (use scope/amp clamp if specified)
  • Signal presence on button circuit when pressed (pulse/closure visible with scope or multimeter)

Diagnostic algorithm

  1. Connect manufacturer-level diagnostic tool, read and record all DTCs and system events. Note freeze frame and any related codes (CAN/BCM/infotainment).
  2. Check vehicle battery state and fuses protecting the telematics/roof console circuits. Replace blown fuses and retest.
  3. Visually inspect the SOS button/roof console and wiring for damage, moisture or corrosion. Repair any obvious issues.
  4. With safe procedures, operate SOS button while monitoring live data for the telematics module and CAN bus to see if a key press is registered.
  5. Measure supply voltage and ground at the telematics module and at the roof console connector. Verify continuity of the button circuit to the module.
  6. Check CAN/LIN communications for errors or loss-of-communication codes. If bus communications are missing, trace and repair CAN wiring/connectors and related module connections.
  7. If wiring and communications are good, inspect/bench-test the SOS button assembly or replace the roof console switch module per manufacturer guidance.
  8. If the button and wiring are confirmed good, consider telematics module software reflash/update or replacement only after confirming with OEM diagnostic procedures.
  9. After repairs, clear codes and perform a functional test including SOS call initiation (use diagnostic test mode or OEM approved test method). Re-scan for reappearance of the fault.

Likely causes

  • Loose/corroded connector or damaged wiring at roof console/telematics module
  • Faulty SOS/call button switch or keyboard assembly
  • Telematics/eCall module software fault or internal failure
  • CAN bus communication failure between modules

Fault status

⚠️ Status
Emergency call (SOS) button/keyboard fault detected — telematics/emergency-call function may be unavailable until wiring, switch assembly or telematics module issue is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B116A B116C B116E U0100 U0140 U0121
160

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