Code
B1C82
LAND ROVER
B — Body
Headlight coil system washing machine relay
Views:
UK: 7
EN: 15
RU: 7
AI status
Completed
Completed
100%
Causes
- Blown fuse for headlight washer circuit
- Faulty headlamp washer pump relay (coil)
- Open or shorted wiring between relay and washer pump/ECU
- Corroded or loose relay/socket/connector pins
- Faulty body control module (BCM) or relay driver output
- Intermittent wiring damage (chafing, water ingress)
Symptoms
- Headlamp washer does not operate when activated
- Washer operates intermittently or only after multiple attempts
- Related headlamp washer fuse blows repeatedly
- Diagnostic trouble code B1C82 stored in body module
- Possible warning message or reduced functionality in body systems
What to check
- Retrieve freeze frame and full DTC list with compatible diagnostic tool
- Visually inspect relay, relay socket and wiring harness for damage or corrosion
- Check relevant fuses (headlamp/washer) and fuse holders
- Operate headlamp washer while watching relay and listening for relay click
- Check connector pins for corrosion, bent pins or water intrusion
- Review wiring diagram to identify relay coil supply and ground circuits
Signal parameters
- Relay coil supply voltage when washer is requested: ~11–14 V (battery voltage)
- Relay coil resistance (typical automotive 12V relay): ~50–200 Ω (vehicle-specific)
- Coil current when energized: ~60–250 mA (depends on relay)
- Control signal from BCM: switched ground or +12V pulse when washer command is given
- No voltage (open) measured at coil when relay not energized
Diagnostic algorithm
- Use a diagnostic scanner to confirm B1C82 and note freeze-frame data and occurrence count.
- Visually inspect relay, socket and wiring for signs of heat, corrosion, water ingress or physical damage.
- Check fuses related to headlamp washer circuit; replace blown fuses only after finding cause.
- With ignition on, operate washer while probing relay coil terminals: verify battery voltage present at the feed terminal and switching (ground or +12V) at the control terminal when commanded.
- Measure coil resistance with relay removed: compare to expected range from vehicle documentation. If coil open or shorted, replace relay.
- If control signal is absent, back-probe control wire at BCM connector and check for driver output when command is given. If no output, verify BCM grounds and supply voltages.
- Inspect and continuity-test wiring between relay and pump/BCM for shorts to ground/battery or open circuits; repair damaged wiring/connectors.
- If wiring and relay check OK but code persists, substitute a known-good relay and retest.
- After repair, clear codes and perform functional test multiple cycles; road or soak test if intermittent condition suspected.
- If fault remains and wiring/relay verified, consider module diagnostic for BCM and consult manufacturer service information for module replacement procedures.
Likely causes
- Relay coil open or shorted
- Corroded connector at relay socket or washer pump
- Blown inline fuse or fusible link
- Damaged ground or power feed to relay coil
- Faulty relay driver in BCM
Fault status
Status
Stored fault: Headlamp/headlight washer relay coil circuit malfunction. Possible open circuit, short to battery/ground, or intermittent connection in relay coil or its wiring. Function of headlamp washer may be lost or intermittent.
Repair difficulty: Medium
Diagnostic time: 0.5 - 1.5 hours
Similar codes
Workshop Manuals
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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