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Home / DTC / B1C59 — Glass window relay output circuit of the electric door

B1C59 — Glass window relay output circuit of the electric door

Detailed page for trouble code B1C59.

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Code

B1C59

LAND ROVER B — Body

Glass window relay output circuit of the electric door

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

Causes

  • Open or shorted wiring in the relay output circuit to the door window motor
  • Faulty window relay (stuck open/closed or intermittent)
  • Failed door/window motor (excessive current draw or internal short)
  • Poor or corroded connector or ground at the door harness
  • Blown fuse or fusible link feeding the relay/motor circuit
  • Faulty body control module / door control unit or software fault

Symptoms

  • Affected window does not move when switch is operated
  • Intermittent window operation (works sometimes)
  • No audible relay click from inside the vehicle when switch is pressed
  • Blown fuse when attempting to operate the window
  • Other door electrical features may be affected if harness damage is present
  • Stored related door/window DTCs or communication U-codes

What to check

  • Scan for current and historic DTCs and check freeze-frame / snapshot data
  • Verify power and ground at the window relay fuse and relay socket with key on
  • Listen for relay click when commanding the window; if no click, test relay operation
  • Inspect door harness at the hinge/bellow for chafing, corrosion, pinched wires or moisture
  • Visually inspect and secure all related connectors (relay, motor, switch, BCM/door module)
  • Measure voltage at the motor connector while commanding the window up/down

Signal parameters

  • Relay output (to motor): ~0 V at rest; battery voltage (~12 V) on active direction when commanded
  • If dual-direction motor wiring: opposite polarity or complementary outputs when reversing direction
  • Motor stall/operating current: can spike (several amps up to tens of amps) — expect significant current during stall; a healthy motor typically draws less than a high-duty stall current
  • Control signal from BCM/door module: open-collector or driver switching to ground or supply; when commanded expect a change from 0 V to battery voltage (or ground) depending on design
  • Continuity: low resistance between relay output and motor supply (>open), typical wiring resistance

Diagnostic algorithm

  1. Retrieve DTCs and related freeze-frame data with a scan tool; note whether the fault is permanent, intermittent or present with ignition off.
  2. Verify vehicle battery voltage is healthy (12.4–12.8 V at rest). Low battery can affect tests.
  3. Visually inspect fuses and relay associated with the affected window circuit; replace if blown and retest.
  4. With door closed, cycle the window while watching/feeling for relay operation; if relay does not click, remove and bench-test or swap with identical relay.
  5. Probe the relay output terminal or motor connector while commanding the window up/down from the switch or scan tool. Confirm expected voltage appears on output when commanded.
  6. If no output voltage but command is present at module, check wiring/connector continuity between module/relay and motor. Repair any open or shorted wiring.
  7. Measure motor current while operating. Excessive current indicates motor or mechanical binding — inspect regulator/sash and lubricate or replace motor/regulator as required.
  8. Inspect door harness in the hinge/bellow area for broken wires or water ingress; repair/replace damaged harness sections and protect with proper sleeving/grommets.
  9. If wiring, motor and relay test good, suspect BCM/door control module driver fault. Verify software/calibration and consider module reflash or replacement as recommended by manufacturer.
  10. Clear codes and perform several operational cycles to confirm repair; monitor for reoccurrence and log any intermittent behavior.

Likely causes

  • Wiring damage at the door hinge/bellows (open or intermittent) — common on doors that open/close frequently
  • Contaminated/corroded connector causing high resistance or intermittent contact
  • Window motor developing high current draw or internal short
  • Relay contacts failed or relay driver in BCM faulty
  • Blown/weak fuse supplying the window circuit

Fault status

⚠️ Status
Fault detected in glass/window relay output circuit for the electric door. Indicates abnormal output (open, short, high resistance, excessive current or missing drive) when the BCM/door module commands the window relay or motor. Investigation required of relay, wiring, connector, motor and control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B1C58 B1C5A B1C5B B1C60 U0121 U0100
351

Browse 351 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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