B1459 — Wiper Washer Pump Motor Relay Coil Circuit Open

body electrical

Is it safe to drive?

Drive with caution Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm B1459 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ignition system for damage, corrosion, chafing or poor contact.
  4. Subsystem check Do a continuity test end-to-end on the wiper washer pump motor relay coil circuit and wiggle the harness while measuring — intermittent opens show up as fluctuating readings.
  5. Subsystem check Swap the coil to another cylinder and see if the fault code follows it.
  6. Subsystem check Inspect spark plugs for wear, oil or carbon tracks and check plug gaps.
  7. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1459 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1459 (parts and labor, USD, independent shop rates): Repair coil wiring or connector: $80–$250; Replace an ignition coil: $150–$380; Replace spark plugs: $90–$250. Overall, fixing B1459 usually costs between $80 and $380. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How much does it cost to fix B1459?

Repair coil wiring or connector — $80–$250; Replace an ignition coil — $150–$380; Replace spark plugs — $90–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does OBD2 code B1459 mean?

Wiper Washer Pump Motor Relay Coil Circuit Open (B1459): a body electrical fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by moisture or oil in the spark plug wells, failed ignition coil or coil pack, faulty ignition control circuit in the ECM.

How do I diagnose B1459 myself?

Start with a scan: confirm B1459, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the wiper washer pump motor relay coil, and verify the suspect component against live data before buying parts.

Is it safe to drive with B1459?

Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

Will B1459 clear itself?

Sometimes B1459 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

When your vehicle's engine control module detects that the wiper washer pump relay coil is not completing its electrical circuit, it stores trouble code B1459. This code indicates an open circuit condition — the module sends voltage to the relay coil but receives no confirmation that current is flowing. In practical terms, the pump never receives the signal to activate, so pressing the washer switch produces nothing at the windshield.

Code B1459 falls within the body electrical category of OBD2 diagnostics. The module sets it after comparing live electrical readings against factory-calibrated parameters, typically requiring multiple drive cycles to confirm a genuine fault rather than a temporary glitch. When the code triggers, the module also captures a freeze frame — a snapshot recording engine speed, load percentage, coolant temperature, and vehicle speed the instant the fault occurred. Reviewing this data before testing helps pinpoint whether the problem happens under specific conditions like cold startup or highway cruising.

The root cause of B1459 is always a break in the electrical path feeding the relay coil. The most frequent culprits include corroded or loose connectors at the relay location, a wire harness that has chafed through from engine bay heat or road debris, a blown fuse dedicated to the washer circuit, or a relay that has failed internally. Less commonly, the control signal wire from the body control module may be damaged, or the module itself may have an output circuit fault. Diagnosing B1459 means systematically checking each of these potential break points until current flow is restored.

Common Symptoms of B1459

  • Washer pump does not activate when the stalk button is pressed
  • Washer indicator on the dashboard may illuminate but no fluid sprays
  • Intermittent operation — works sometimes, fails other times
  • Possible check engine light if the module logs an electrical fault
  • Other body electrical functions operate normally, isolating the issue to the washer circuit
  • No fluid delivery even with a confirmed full reservoir and functioning wiper blades

What Causes B1459

  • Corroded, loose, or disconnected electrical connector at the washer pump relay
  • Damaged wiring harness — broken wire, insulation wear, or pinched wire in the engine bay
  • Blown fuse protecting the washer pump circuit
  • Internally failed wiper washer pump motor relay coil
  • Short or open in the control signal wire from the body control module
  • Faulty body control module output stage
  • Aftermarket alarm or accessory installation that interfered with the factory wiring

How to Diagnose B1459

  1. Connect an OBD2 scanner and confirm B1459 is stored. Record the freeze frame data — this shows the exact conditions (RPM, temperature, speed) when the module first detected the open circuit.
  2. Check for related trouble codes. Codes in the B1xxx or U0xxx range may point to a broader electrical issue, a communication problem, or a failing module. Address all stored codes together.
  3. Consult manufacturer technical service bulletins. Search by your vehicle's make, model, and model year on nhtsa.gov or the OEM website. Some B1459 failures are covered by factory-issued updates, wiring harness repairs, or software reflashes.
  4. Visually inspect the washer pump relay and surrounding connectors. Look for corrosion, bent pins, moisture intrusion, or loose plugs. Pay particular attention to grounds — a bad ground will read as an open circuit.
  5. Perform a voltage and continuity check. With the ignition on, verify battery voltage reaches the relay coil power terminal. Then check continuity end-to-end on the control circuit from the body module to the relay. A multimeter reading of OL (open loop) anywhere in the circuit confirms the break.
  6. Test or substitute the relay. Swap in a known-good identical relay if available. If the code clears with a different relay, the original relay coil is open.
  7. Clear the code and road-test the vehicle. Operate the washer system multiple times and complete a full drive cycle matching the freeze frame conditions. If B1459 does not return, the repair is confirmed.

Repair Options and Costs

  • Connector repair or replacement: $60–$150. Clean corroded pins with electrical contact cleaner, or replace the connector housing and pins if damage is physical.
  • Wiring harness repair: $80–$220. Splice and solder broken wires, or route a new section of harness if the damage is extensive.
  • Wiper washer pump motor relay replacement: $45–$130 for the part, or $120–$280 with labor.
  • Body control module replacement: $200–$500 parts alone; BCM programming may be required by a dealership.

Total Cost to Fix B1459

Most B1459 diagnoses