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Home / DTC / B1D67 — power module of right headlight

B1D67 — power module of right headlight

Detailed page for trouble code B1D67.

34,405codes
59brands
11,914generic
22,491specific
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Code

B1D67

LAND ROVER B — Body

power module of right headlight

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

Causes

  • Faulty right headlight power/driver module (internal failure)
  • Blown fuse or failed headlight relay
  • Damaged, corroded, or loose connector at the headlight/module
  • Wiring short to power or ground, open circuit, or high resistance in feed/ground
  • Body control module (BCM) or front electronic control unit communication/software issue

Symptoms

  • Right headlight does not illuminate or is dim
  • Intermittent operation or flicker of right headlight
  • Headlight warning lamp/message on dash (lamp fault)
  • Asymmetric beam pattern or reduced function (e.g., DRL/headlamp modes missing)
  • Multiple related body-electronics or lighting warnings if communication is affected

What to check

  • Read and record all stored DTCs and freeze-frame data with a manufacturer-capable scan tool; note active vs pending status
  • Check battery voltage and system supply (engine off and running) before and during tests
  • Inspect fuses and relays for the right headlight circuit; replace known-bad items
  • Visually inspect the right headlight connector and wiring for corrosion, bent pins, water ingress or physical damage
  • Measure supply voltage at the headlight power module connector with lights on; verify ground continuity to chassis
  • Check for CAN/LIN communications to the headlight module using the scan tool (verify module present and responding)

Signal parameters

  • Module supply voltage: approx. 11–14.5 V with engine running (measure at module power pin)
  • Ground continuity: low resistance to chassis (typically
  • Control/data bus: CAN/LIN messages present and valid (use scan tool to verify communication)
  • Module current draw: low in standby, increases when lamp mode is active (value depends on lamp type)
  • If PWM drive is used: lamp drive frequency typically in the hundreds to low thousands Hz (verify with oscilloscope if needed)

Diagnostic algorithm

  1. Connect a diagnostic scan tool, read and record B1D67 and any other related DTCs; note freeze frame and live data.
  2. Clear codes and operate the right headlight to see if the code returns; observe behavior and any immediate faults.
  3. Verify power and ground at the right headlight power module connector with the lamp command ON; compare to battery voltage and chassis ground.
  4. Inspect connector pins for corrosion, bent pins or moisture; repair or replace connector as required.
  5. Check fuses and relays for the headlight circuit; replace any blown or suspect items and retest.
  6. Verify data bus communication to the headlight module with the scan tool; if module is not present on bus, investigate wiring back to BCM.
  7. Perform a wiggle test on wiring between the module and BCM while monitoring live data to try to reproduce intermittent faults.
  8. If wiring and power/ground are good and communication is present, consider replacing the right headlight power module or the complete headlight assembly per manufacturer procedure.
  9. After repair or replacement, reprogram/configure/module coding if required by manufacturer; clear codes and verify proper operation across all lamp modes.
  10. If fault persists, escalate to body/network diagnostics (BCM, wiring harness splice, or professional diagnostic support).

Likely causes

  • Internal failure of the right headlight power/LED driver module
  • Supply fuse blown or relay contact failed for the right headlight circuit
  • Corroded or bent pins, water ingress or poor mating at the headlight connector
  • Open or shorted wiring between the BCM and the headlight module (power, ground or data bus)
  • Lost or corrupted CAN/LIN communication to the headlight module or incorrect module programming

Fault status

⚠️ Status
Right headlight power module fault detected (B1D67). May cause right lamp inoperative, intermittent operation, or a dashboard lamp fault. Check power, ground, connectors, communication and module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1D66 B1D68 B1D60 U0100 U0073
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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