B1446 — Wiper Park Sense Circuit Failure #

Note: The description for DTC B1446 may vary depending on the vehicle manufacturer (OEM). Always refer to your OEM service manual for the most accurate definition.

• B1446: Wiper Park Sense Circuit Failure (General/Standard)
• B1446: Wiper Park Switch Circuit Failure (Ford)
• B1446: Wiper Park Position Sensor Circuit Malfunction (Toyota/Lexus)
• B1446: Wiper Park Position Signal Fault (Chrysler, GM)

Summary for code B1446 #

Diagnostic Trouble Code (DTC) B1446 relates specifically to the wiper park sense circuit: the electrical pathway responsible for detecting when the windshield wipers have returned to their “parked” (fully lowered and off) position. This feedback signal allows the vehicle’s body control module (BCM) or wiper module to know if the wipers are properly parked when switched off. If there is a malfunction—such as a broken wire, corroded connection, or faulty sensor—the system triggers B1446. In practice, this can impact wiper operation, especially auto-wipe or rain-sensing features. While not always critical to vehicle safety, this code can lead to inconvenience or compliance issues in adverse weather.

Common symptoms for code B1446 #

The first sign of a B1446 code is usually abnormal wiper behavior. Since the system cannot confirm if the wipers are in the “parked” position, you may notice glitches in automated or manual wiper operation. Frequently, this includes issues with wipers stopping mid-windshield, failing to return to the bottom, or erratic movement during auto-off cycles. In rare cases, the wipers may not operate at all, or may “stutter” when returning to park.

• Wipers stopping in the wrong position (midway or partially up the windshield)
• Wipers not returning to the full “park” (off) position
• Wipers running continuously, even when switched off
• Wipers failing to activate in automatic/rain-sensing mode
• Intermittent or inconsistent wiper operation
• Related warning lights or messages on the dashboard

Most common causes for code B1446 #

A B1446 code is generally triggered by a fault in the wiper park sense circuit or related components. These issues can range from wiring problems to sensor or switch failures. The causes, in order of likelihood, are as follows:

1. Faulty wiper park position sensor or switch (mechanical wear, internal failure)
2. Damaged or corroded wiring/connectors in the wiper park sense circuit
3. Loose, disconnected, or improperly seated electrical connectors at the wiper motor or BCM
4. Faulty wiper motor assembly (integrated park switch failure)
5. Blown fuse or relay affecting the wiper system
6. Water intrusion or oxidation at the wiper assembly or engine bay fuse box
7. Rare: Body Control Module (BCM) or Wiper Module failure

Step-by-step diagnosis for code B1446 #

Diagnosing a B1446 requires a methodical approach. Start with the simplest and most accessible components, moving toward more complex or concealed faults. As with any electrical troubleshooting, ensure safety by disconnecting the battery if working with connectors or modules.

1. Verify the DTC with a scan tool and clear the code. See if it returns immediately.
2. Inspect the wiper operation: Do the wipers park correctly? Listen for abnormal noises.
3. Visually examine the wiper motor, park sense switch, and related harness for signs of damage, looseness, or corrosion.
4. Check all relevant fuses and relays (refer to your owner’s manual for fuse locations).
5. Use a multimeter to test for continuity and voltage at the wiper park sense circuit (compare readings to OEM specifications).
6. Check the BCM or wiper module for proper input/output signals (if accessible and as per service manual procedures).
7. If all wiring and components test fine, consider a functional test or replacement of the wiper park sensor or motor assembly.
8. As a last resort, diagnose the BCM or wiper control module for internal faults.

Possible repairs for code B1446 #

The most common repairs for a B1446 code directly address the underlying circuit or component failure. Your repair will depend on which step in the diagnostic process exposes the fault. Always use OEM parts when possible for best reliability.

• Replace the wiper park position sensor or park switch
• Repair or replace damaged, corroded, or loose wiring/connectors in the wiper park circuit
• Reconnect or properly seat any loose electrical connectors at the wiper motor or BCM
• Replace the entire wiper motor assembly (if the park switch is integrated and non-serviceable)
• Replace any blown fuses or faulty relays affecting the wiper system
• Clean and protect affected connectors or fuse boxes from water intrusion
• In rare cases, replace or reprogram the BCM or wiper control module

Is it safe to drive with code B1446? #

Limited: While B1446 typically does not disable the vehicle, it can compromise your visibility during rain or snow if the wipers do not function correctly. If your wipers are not parking properly or fail to operate, this is a safety concern—especially if weather conditions demand clear visibility. If the wipers run continuously, it can distract the driver or cause mechanical wear. Address this code as soon as possible to avoid further inconvenience or safety risk.

Vehicles most commonly affected by code B1446 #

B1446 is not exclusive to a single brand; it appears in many makes using electronically controlled wiper systems. The following vehicle types are more frequently reported with this code:

• Ford (Focus, Fusion, Escape, Explorer)
• Toyota/Lexus (Camry, Corolla, RAV4, ES350, RX350)
• Chrysler/Dodge/Jeep (Grand Cherokee, Charger, 300C)
• General Motors (Chevrolet Malibu, Equinox, Silverado)
• Honda/Acura (Accord, CR-V, Pilot)
• Nissan/Infiniti (Altima, Murano, Pathfinder)

Common mistakes & best practices with code B1446 #

Misdiagnosing B1446 often stems from overlooking the basics or replacing expensive parts prematurely. Always start with fundamental checks before considering module replacement.

• Not checking for blown fuses or simple connector faults before replacing components
• Ignoring signs of water intrusion or corrosion at the wiper motor harness
• Assuming the BCM is faulty without confirming all circuit inputs/outputs
• Not using OEM parts, resulting in recurring issues
• Skipping a scan tool re-scan after repair to confirm resolution

Express FAQ for code B1446 #

Q: Can a bad wiper blade cause B1446?
A: No. The code is related to the electrical sensing circuit, not the wiper blade itself. However, a jammed wiper arm can sometimes contribute to motor or sensor failure.

Q: Do I need to replace the entire wiper motor if I have B1446?
A: Not always. Some vehicles have a replaceable park switch or sensor. Others integrate this component into the wiper motor assembly. Always check your service manual before purchasing parts.