Code
B1C59
LAND ROVER
B — Body
Glass window relay output circuit of the electric door
Views:
UK: 6
EN: 11
RU: 8
AI status
Completed
Completed
100%
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
- Retrieve DTCs and related freeze-frame data with a scan tool; note whether the fault is permanent, intermittent or present with ignition off.
- Verify vehicle battery voltage is healthy (12.4–12.8 V at rest). Low battery can affect tests.
- Visually inspect fuses and relay associated with the affected window circuit; replace if blown and retest.
- 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.
- 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.
- 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.
- Measure motor current while operating. Excessive current indicates motor or mechanical binding — inspect regulator/sash and lubricate or replace motor/regulator as required.
- 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.
- 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.
- 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
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