B1459 — Wiper Washer Pump Motor Relay Coil Circuit Open #

The description for this fault code may vary depending on the vehicle manufacturer.

Known label variations for B1459:

• Wiper Washer Pump Motor Relay Coil Circuit Open (Generic/OEMs)
• Wiper Washer Pump Relay Open Circuit (Ford)
• Windshield Washer Pump Relay Coil Malfunction (Toyota)
• Wiper/Washer Relay Open Circuit (GM, Chrysler)

Code summary for B1459 #

The B1459 code indicates that the vehicle’s onboard diagnostic (OBD-II) system has detected an open circuit in the wiper washer pump motor relay coil. The relay is an electromechanical switch that controls power to the washer pump motor, which sprays washer fluid onto the windshield. When the circuit is “open,” it means there is a break or disconnect preventing current flow through the relay coil. This condition prevents the washer pump from operating, potentially affecting windshield visibility. The code may be triggered by wiring issues, relay failure, or a fault in the control module.

Common symptoms for B1459 #

Drivers and technicians may notice several telltale symptoms when B1459 is present. The most obvious sign is the windshield washer system not functioning when activated. This can compromise visibility, especially in adverse weather conditions. In some cases, the wiper system may also be affected, depending on vehicle wiring and control logic. Warning lights or messages related to the washer system may appear on the dashboard.

• Windshield washer pump does not operate
• No washer fluid spray when control is activated
• Possible washer system warning light/message
• Wipers may not activate in washer mode (on some vehicles)
• Intermittent or unpredictable washer operation

Probable causes for B1459 (by frequency) #

The most common causes of B1459 revolve around electrical faults. Since the code specifically points to an open relay coil circuit, troubleshooting should focus on components and connections responsible for delivering power and ground to the coil. Below are the most likely causes, ranked by frequency:

1. Faulty or failed wiper washer pump relay
2. Open (broken) wiring or poor connector at relay coil circuit
3. Corroded or loose electrical connectors at the relay or pump
4. Blown fuse in the washer pump or relay circuit
5. Faulty body control module (BCM) or related control unit (less common)
6. Internal short/open in the washer pump motor (rare)

Step-by-step diagnosis for B1459 #

A systematic approach is key to pinpointing the root cause of B1459. Whether you’re a seasoned technician or a DIY enthusiast, following these steps helps avoid unnecessary part replacements and ensures a safe, effective repair.

• Verify the code: Use a scan tool to confirm B1459 is present and note any related codes.
• Check washer system operation: Attempt to operate the windshield washer and observe for any activity or noises.
• Inspect fuse(s): Locate and check the fuse(s) for the washer pump and relay circuit. Replace if blown.
• Locate the relay: Refer to your vehicle’s wiring diagram or service manual to find the washer pump relay.
• Test relay function: Swap the relay with a known good unit (if possible) or bench-test for continuity across the coil terminals.
• Check wiring and connectors: Inspect the relay coil circuit wiring for breaks, corrosion, or loose pins at connectors. Wiggle-test the harness while monitoring with a test light or multimeter.
• Check for control signal: With ignition on and washer activated, check for voltage at the relay coil control terminal (refer to wiring diagram for correct pin).
• Test ground path: Ensure the relay coil ground circuit is intact and has low resistance.
• Check control module: If all wiring and components are good, consider a fault in the body control module or related controller (rare step; confirm with advanced diagnostic tools).
• Clear code and retest: After repairs, erase the code and recheck washer operation and code status.

Possible repairs for B1459 #

Repairs for B1459 should directly address the component or circuit found faulty during diagnosis. Always use high-quality parts and follow proper electrical repair techniques to ensure long-lasting results.

• Replace the faulty wiper washer pump relay
• Repair or replace open or damaged wiring/connectors in the relay coil circuit
• Clean corroded terminals and apply dielectric grease to prevent future issues
• Replace blown fuse(s) and investigate underlying cause
• In rare cases, replace or reprogram the body control module (BCM) if confirmed defective
• Replace the windshield washer pump motor if internal fault is found

Is it safe to drive with code B1459? #

Limited: While B1459 will not typically affect engine performance or core safety systems, it does mean that your windshield washer system is inoperative. This can become a safety hazard in rain, snow, or dusty conditions when you need to clear your windshield for visibility. Driving with this code is not recommended in poor weather or on long trips. Address the issue as soon as possible to ensure your visibility and compliance with safety regulations.

Vehicles most commonly affected by B1459 #

This code appears most frequently on vehicles where the washer pump relay is a separate serviceable component, typically found in the fuse/relay box or integrated into the body control module. It is more prevalent in certain makes and models:

• Ford (Focus, F-150, Fusion, Escape)
• Toyota (Camry, Corolla, RAV4, Tacoma)
• General Motors (Chevrolet Malibu, Silverado, Cruze; GMC Sierra)
• Chrysler, Dodge, Jeep (RAM 1500, Grand Cherokee, Charger)
• Honda, Nissan, Hyundai (less frequent but possible)

Common mistakes and best practices for B1459 #

Avoiding misdiagnosis and wasted parts is key. Here are pitfalls to steer clear of and some best practices:

• Do not replace the washer pump or relay without testing: Many assume the pump is bad when a wiring or relay issue is the real culprit.
• Overlooking fuses: Always check related fuses before diving deeper into diagnostics.
• Ignoring connector corrosion: Moisture ingress is common at exterior connectors—clean and protect them.
• Skipping wiring checks: Use a multimeter or test light to verify continuity, don’t just rely on visual inspection.
• Refer to OEM wiring diagrams: These provide accurate circuit details and relay locations.
• Clear the code after repairs: Ensure the fault doesn’t return with a fresh cycle.

Express FAQ for B1459 #

Here are quick answers to common questions about the B1459 code:

• Q: Will this code cause my car to fail inspection?
  A: In most regions, a non-functioning washer system can lead to inspection failure because it’s considered a safety feature.
• Q: Can I just bypass the relay to get the washer working?
  A: Bypassing the relay is not recommended. It can cause electrical damage or even a fire. Proper diagnosis and repair are the safest option.
• Q: Is this repair expensive?
  A: Most repairs are affordable, usually involving a relay, fuse, or wiring repair. Only rarely is a control module replacement needed, which is more costly.