B1459
Wiper Washer Pump Motor Relay Coil Circuit Open
Body Chassis/Safety Wiper/Washer System 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The wiper washer pump's relay coil circuit has an electrical break, preventing the relay from activating. Think of it like a broken switch that can't send power to turn on the windshield washer pump.

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Symptoms You May Notice
3 known symptoms for this code
Windshield washer pump does not operate
No fluid sprays when washer button is pressed
Fault code triggers without other electrical issues
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the voltage and continuity of the wiper washer pump relay coil circuit. When the washer command is sent, the ECU expects to detect proper coil current draw through the relay. An open circuit prevents current flow, triggering the fault.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Relay Coil Current 200-600 mA when activated 0 mA or below detection threshold
Circuit Voltage 12-14V supplied to relay No voltage drop across coil
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Relay connector and wiring
Inspect the washer pump relay connector for corrosion, loose pins, or damaged wires and clean or reseat as needed.
2
Wiper washer pump relay
Replace the relay itself if voltage is present at the connector but pump still does not operate.
3
Wiper washer pump motor and circuit harness
Test continuity through the entire washer circuit from relay to pump and repair or replace damaged wiring.