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Home / DTC / B1C17 — Driver's side mirror switch to the left

B1C17 — Driver's side mirror switch to the left

Detailed page for trouble code B1C17.

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Code

B1C17

LAND ROVER B — Body

Driver's side mirror switch to the left

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

Causes

  • Faulty driver-side mirror switch (mechanical or electrical failure)
  • Open, shorted or corroded wiring between switch and door/comfort module
  • Poor connector pin contact at switch or module
  • Faulty mirror actuator/motor (mechanically jammed or electrically defective)
  • Door or body control module software issue or internal fault
  • Aftermarket equipment or damage affecting wiring harness

Symptoms

  • Driver mirror does not move left (may move right/up/down only)
  • Mirror movement is intermittent or sporadic when commanding left
  • Mirror may stop mid-travel or make noise when operated left
  • DTC stored and possibly mirror-related fault message on dash (vehicle dependent)

What to check

  • Read and record freeze frame and full DTC list with a compatible diagnostic tool
  • Verify vehicle battery voltage and test power/ground at door module and switch
  • Operate mirror switch while observing mirror response and DTC replay
  • Visually inspect switch, door harness, and mirror connector for corrosion, damage, or pin push-out
  • Measure continuity and resistance of switch circuit with harness motion through full door travel
  • Check for related codes (door module, CAN, or mirror actuator codes)

Signal parameters

  • Command input: expected change in switch output when moved left (voltage or resistance change)
  • Typical supply: vehicle battery nominal 11–14 V at switch with ignition on
  • Ground continuity: near 0 Ω to chassis ground
  • Switch resistance: varies by design — should change smoothly between positions without open/short
  • Actuator drive: motor supply when commanded (voltage present at mirror motor when left command issued)

Diagnostic algorithm

  1. Connect a diagnostic scanner, read B1C17 and related codes, record freeze frame data.
  2. Clear codes, then attempt to operate the mirror left while monitoring live data and watching for code reappearance.
  3. Inspect switch and connectors for corrosion, bent pins, or water ingress; repair as needed.
  4. With ignition on, backprobe switch pins to confirm supply voltage and ground; verify the switch output changes when moved left.
  5. Check continuity and resistance between the switch and door/body control module pins while moving the door to reproduce harness flex faults.
  6. Command the mirror left from a diagnostic tool and measure voltage at the mirror actuator connector; if voltage present but no movement, suspect actuator/mechanically jammed mirror.
  7. If no actuator voltage when commanded, trace wiring back to module and check module outputs; substitute known-good switch or perform bench test if available.
  8. Repair or replace failed wiring, connector, switch, actuator, or module as indicated. Reprogram or update module software if a software fix is available.
  9. After repair, clear codes and verify proper mirror operation through full travel and drive cycles.

Likely causes

  • Broken switch contacts or worn switch potentiometer
  • Pinched or chafed cable in door hinge area causing intermittent/short circuit
  • Moisture intrusion at mirror connector causing high resistance or short
  • Mirror actuator seized when commanded left, causing excessive current or no position feedback
  • Loose ground or supply feed to switch

Fault status

⚠️ Status
Driver-side mirror left movement command not detected / out of range (B1C17)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1C16 B1C18 B1C1A
286

Browse 286 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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