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Home / DTC / B1172 — internal door unlock switch of the driver

B1172 — internal door unlock switch of the driver

Detailed page for trouble code B1172.

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Code

B1172

LAND ROVER B — Body

internal door unlock switch of the driver

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 21 RU: 10
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Page language: EN

Causes

  • Failed or worn driver door interior unlock switch
  • Open or shorted wiring in the switch circuit
  • Poor connector pin contact or corrosion at the switch harness
  • Water ingress or contamination in switch or connector
  • Faulty body control module (BCM) or door module input
  • Blown fuse or poor ground in the body electrical system

Symptoms

  • Interior driver-side unlock switch does not operate or works intermittently
  • Driver door does not unlock from the interior switch but may unlock by remote/key fob
  • Other door functions intermittent if wiring/shared circuit is damaged
  • DTC present in vehicle scan tool for door unlock switch input

What to check

  • Verify customer complaint and try the driver interior unlock switch several times while observing behavior
  • Check related fuses and general body electrical power/ground
  • Visually inspect switch, connector, and wiring for damage, corrosion or water ingress
  • Scan vehicle and read stored/active DTCs and freeze-frame data
  • Back-probe switch connector and measure voltages/waveform while operating the switch
  • Measure continuity/resistance of switch contacts and wiring to the module with connectors disconnected

Signal parameters

  • Switch expected to present a clear open/closed signal; closed contact should show near 0 Ω across terminals
  • Back-probe with switch inactive: reference voltage typically pulled to supply or ground depending on design (common values: 0 V or battery voltage ~12 V)
  • When operated, voltage should change cleanly between the two states (no intermittent/noise)
  • Wiring resistance from switch to module should be low (

Diagnostic algorithm

  1. Confirm symptom and retrieve DTC(s) with a diagnostic scanner. Note whether code is current or historic.
  2. Inspect the driver door interior unlock switch visually. Check connector for corrosion, bent pins, or water.
  3. Check related fuses and vehicle grounds. Repair any blown fuses or poor grounds before further testing.
  4. Back-probe the switch connector. With ignition on, operate the switch and observe voltage change. Compare to expected open/closed behavior.
  5. If voltage is incorrect or intermittent, disconnect the switch and measure switch contact resistance directly while operating it. Replace switch if contacts do not change cleanly or show high resistance.
  6. If switch tests OK, perform continuity and insulation checks from switch connector to the body/door module input. Repair any broken wires or shorts found (repair harness, replace broken wires, repair connector).
  7. Inspect door harness where it passes the hinge for chafing. Repair or replace harness sections as needed.
  8. After repairs, clear DTCs and re-test operation multiple cycles. Confirm code does not return and that switch works reliably.
  9. If wiring and switch are good but the fault persists, verify input at the receiving module. Consider module replacement only after confirming wiring and switch integrity.

Likely causes

  • Switch contacts worn or stuck (most common)
  • Frayed or chafed wiring inside the door harness from repeated door movement
  • Corroded connector terminals at the switch
  • Connector not fully seated after previous door trim removal
  • Intermittent ground due to paint, corrosion, or loose fastener

Fault status

⚠️ Status
Driver door internal unlock switch circuit fault — open/short/intermittent. Inspect switch, connector, wiring and related module input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1170 B1171 B1173 B1180 U0121
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