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Home / DTC / B1875 — Left and right turn signal switch active

B1875 — Left and right turn signal switch active

Detailed page for trouble code B1875.

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Code

B1875

LAND ROVER B — Body

Left and right turn signal switch active

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

Causes

  • Faulty turn signal stalk/switch (mechanical or contact failure)
  • Short between left and right turn signal wiring (chafing, pinched harness)
  • Stuck or faulty hazard switch
  • Corroded/loose connector or poor ground at switch or BCM
  • Aftermarket wiring (alarm, trailer wiring) causing cross-feed between circuits
  • BCM or instrument cluster internal fault

Symptoms

  • Both left and right turn indicators showing active or flashing together
  • Hazard lights operate incorrectly or cannot be selected independently
  • Turn signals do not function properly or flash irregularly
  • Instrument cluster turn signal indicator may show both sides or display a warning
  • Possible intermittent function depending on steering column position or vehicle vibration

What to check

  • Retrieve freeze frame and live data with a diagnostic scanner; note input states for left/right turn/hazard switches
  • Operate left, right and hazard switches and observe live status of inputs in the scan tool
  • Visually inspect steering column connectors, hazard switch, and BCM connectors for corrosion, damage, or water ingress
  • Inspect aftermarket wiring (alarms, trailer sockets) for splices into turn circuits
  • Check for continuity/short between left and right turn signal wires with ignition off and connectors disconnected
  • Measure voltage at the switch connector while operating stalks: verify expected pulsed voltage only on commanded side

Signal parameters

  • Inactive circuit voltage: ~0 V (ground) or open-circuit depending on design
  • Active circuit voltage: ~12 V pulsed when flashing (vehicle battery voltage)
  • Flash frequency: typically about 60–120 cycles per minute (≈1–2 Hz) for turn signal output — varies by model
  • Low resistance expected across a closed switch contact; infinite/OL when open (check with multimeter)

Diagnostic algorithm

  1. Connect diagnostic scanner; read and record B1875 and any related codes, and note live input states for left/right/hazard switches.
  2. Visually inspect steering column, hazard switch, wiring harness, and BCM connector for damage, corrosion, or moisture.
  3. Operate turn left, turn right, and hazard while watching live data: confirm which inputs register and whether both become active simultaneously.
  4. With ignition off, disconnect the multi-pin connector at the turn/hazard switch. Check for short between left and right circuit pins and to power/ground using an ohmmeter. Repair any shorted wiring.
  5. With connector reconnected, backprobe the switch connector and measure voltage/pulse on each circuit while operating the stalk and hazard. Replace switch if it energizes the opposite circuit or shows cross-feed.
  6. If switch and wiring check good, inspect BCM connector and harness to BCM for damage. Check for aftermarket splices into turn circuits (alarm, trailer) and remove/repair as needed.
  7. If wiring and inputs at the BCM look correct, perform BCM input/output tests per service manual. Consider BCM replacement or reprogramming only after confirming harness and switch are good.
  8. Clear codes and road-test, exercising turn and hazard functions to confirm repair. Re-scan to ensure code does not return.

Likely causes

  • Turn/hazard switch contacts shorted or stuck, causing simultaneous feed to both circuits
  • Wiring short or pinched cable between left and right indicator circuits
  • Faulty or corroded connector at steering column or BCM creating cross-connection
  • Aftermarket trailer/lighting harness tied into turn circuits without proper isolation

Fault status

⚠️ Status
BCM reports both left and right turn signal switch inputs active simultaneously — indicates possible short or fault in switch, wiring, hazard circuit, or BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1870 B1871 B1872 B1895 U0100 U0415
320

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