B1C80

Code

LAND ROVER B — Body

rear washing pump relay coil system

Brand: LAND ROVER

Type: B — Body

Views: UK: 14 EN: 28 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Blown fuse for washer pump circuit
Faulty rear washer pump relay (coil open or shorted)
Damaged wiring harness (open, short to battery, short to ground) to relay coil
Poor or corroded connector or pin at relay socket or control module
Faulty Body Control Module (BCM) or relay driver output
Water ingress or corrosion in rear washer pump area or relay connections

Symptoms

Rear washer pump does not operate when switch is activated
No relay click from the rear washer pump relay when requested
Washer fluid not sprayed from rear jets
Washer fuse repeatedly blows
Warning message or lamp on dash related to washer system
Intermittent operation of rear washer

What to check

Scan for B1C80 and any related stored or pending codes; record freeze-frame data
Visually inspect relay socket, relay, and wiring for corrosion, damage, or water ingress
Check washer pump fuse and fuseholder for continuity and correct rating
Listen for relay click while commanding rear washer from diagnostic tool or switch
Measure battery voltage at relay supply terminal with ignition ON
Backprobe relay coil control pin while commanding the pump to verify switching (voltage or ground)

Signal parameters

Supply voltage at relay battery terminal: ~12 V (key ON) — should be near battery voltage
Relay coil control when activated: should be driven to ground or supplied with switched voltage by BCM (logic: 0 V to ~12 V transition)
Typical relay coil resistance (general range): ~50–200 ohms (varies by relay design) — open or near-infinite indicates failed coil, near 0 indicates short
Expected coil current when energized: ~0.06–0.3 A (depends on coil resistance and system voltage)
No PWM frequency expected for a simple on/off relay coil (steady apply or ground when commanded)

Diagnostic algorithm

Retrieve and record all stored codes and freeze-frame data. Note when fault occurs (continuous or intermittent).
Visually inspect rear washer relay, socket, associated connectors, and wiring harness for damage, corrosion, or water intrusion. Repair any visible damage.
Check the washer system fuse for continuity and correct rating. Replace if blown and determine cause if it blows again.
With ignition ON, command the rear washer pump using a diagnostic tool or switch. Listen for the relay click. If no click, proceed.
Backprobe the relay socket: verify supply voltage at constant feed terminal (~battery voltage) and monitor the coil control terminal while commanding the pump. Confirm the control terminal changes state (to ground or +12 V) when activated.
If control signal is present but relay does not click, remove relay and bench-test coil resistance and operation (apply 12 V across coil). Replace relay if coil open/short or relay fails to operate.
If control signal is NOT present, trace/measure continuity from BCM (or relay driver module) to relay control pin. Check for short to power/ground and repair wiring as necessary.
If wiring and relay are good but control output is not present or is erratic, inspect BCM grounds and related fuses. If driver output remains faulty, consider BCM/driver module diagnostics or replacement per manufacturer procedure.
If relay and control are good but pump still does not run when relay activated, bench-test the pump directly (apply fused 12 V to pump and ground). Repair or replace pump if faulty.
After repairs, clear codes, perform operation test several times, and verify code does not return. Document repair and retest under conditions that produced the fault.

Likely causes

Failed relay (most common)
Open or corroded connector at relay/pump
Blown fuse or poor fuse connection
Wiring short or open between relay and BCM

Fault status

⚠️ Status

Stored when the vehicle detects an open, shorted, or otherwise abnormal condition in the rear washer pump relay coil circuit preventing proper relay operation.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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