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Home / DTC / B106D — head retention switch

B106D — head retention switch

Detailed page for trouble code B106D.

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Code

B106D

LAND ROVER B — Body

head retention switch

Brand: LAND ROVER
Type: B — Body
Views: UK: 8 EN: 20 RU: 18
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Page language: EN

Causes

  • Faulty head restraint (head retention) switch
  • Open, shorted or corroded wiring/connector between switch and restraint control module
  • Poor ground or supply to the switch
  • Water ingress or contamination of connector or switch
  • Damage from seat removal/installation or impact
  • Faulty restraint control module or related module software fault

Symptoms

  • Restraint/airbag warning light illuminated
  • Passive head restraint may not move or lock correctly
  • Diagnostic trouble code B106D stored in restraint control module
  • Possible related DTCs for other restraint/seat sensors
  • Intermittent fault that may change with seat movement

What to check

  • Read and record all DTCs and freeze‑frame data with a factory or dealer-level scan tool
  • Visually inspect the head restraint switch and connector for damage, corrosion, moisture or foreign material
  • Inspect seat and under‑seat wiring harness routing for chafe, pinch or connector damage
  • Verify fuses and power/ground circuits related to the restraint system
  • Check for other related airbag/passive restraint codes that may point to a common fault
  • Perform wiggle test on seat wiring while monitoring live data for the switch

Signal parameters

  • Switch type: typically a simple open/closed contact; output reported as switch state to restraint module
  • Expected voltage: when supplied, reference/supply typically ~5 V or ignition/switched 12 V depending on vehicle; check OEM wiring diagram
  • Closed (activated) resistance: near 0 Ω between switch terminals; open when released (high resistance/OL)
  • Open circuit behavior: module reports missing signal or out‑of‑range when >10 kΩ or open
  • Intermittent/unstable: fluctuating voltage or resistance indicates wiring or connector intermittent

Diagnostic algorithm

  1. Retrieve all restraint DTCs and record freeze frame/live data. Note whether code is current or historic.
  2. Follow manufacturer safety procedure for servicing restraint systems (disconnect battery negative and wait specified time to disable airbags before accessing connectors).
  3. Visually inspect the head restraint switch assembly and connector for damage, corrosion, moisture, or improper seating.
  4. Using the wiring diagram, identify switch supply, signal, and ground pins at switch and at the restraint control module.
  5. With ignition ON (and battery reconnected per safety procedure), monitor switch signal with a scan tool or multimeter while operating the head restraint. Look for expected change in voltage or resistance.
  6. Perform continuity/resistance check between switch terminals and control module pins with connectors disconnected. Repair any opens or shorts found.
  7. If wiring and connector are good, bench‑test or swap the known‑good switch (if available) or measure switch resistance while actuating. Replace switch if out of specification or intermittent.
  8. Inspect and repair/replace any damaged harness sections, pins or connectors. Apply dielectric grease if moisture was present.
  9. Clear codes and retest. If B106D returns and wiring/switch verify good, consider module diagnosis or reflashing per dealer procedures.
  10. After repair, perform a full system scan and verify no other restraint faults remain and that the system completes built‑in self‑tests.

Likely causes

  • Connector pins corroded or pushed out at the switch under the seat
  • Wiring chafed where harness passes through seat or body
  • Switch failed electrically (stuck, intermittent contact)
  • Module reporting erroneous data due to internal fault or firmware issue
  • Blown fuse or poor power/ground at the circuit

Fault status

⚠️ Status
Head retention switch circuit fault — open/short/intermittent signal detected by restraint control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B106A B106B B106C B106E B1790
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