B1441: Wiper Mode Switch Short to Ground
The B1441 code indicates that the Body Control Module (BCM) or wiper control module has detected a short to ground in the wiper mode selector switch circuit. This switch allows the driver to select intermittent, low, high, or other wiper speeds. A short to ground means the signal voltage is abnormally low (near 0V) when the module expects a variable or reference voltage based on switch position. In Toyota and Lexus vehicles, this code is part of the multiplex (MPX) network, where the wiper switch sends digital signals to the BCM over a data bus. The short can prevent proper wiper operation or cause erratic behavior.
1. Commonly Affected Makes
2. Most Common Causes
- Internally damaged wiper mode switch with a short to ground
- Chafed or deteriorated wiring in the switch signal circuit contacting chassis ground
- Corroded, bent, or moisture-damaged pins in the switch or BCM connector
- Body Control Module (BCM) with a damaged input circuit
- Improperly installed aftermarket electrical modification affecting the wiper circuit
3. Symptoms You Will Notice
- Wipers operate continuously without stopping
- Wipers do not respond to mode selection or work erratically
- Wipers stuck in one speed or intermittent mode not working
4. Step-by-Step Diagnosis
Scan for B1441 and any related codes; clear and retest to confirm active fault.
Visually inspect the wiper switch connector and BCM connector for bent pins, corrosion, or moisture.
Check the wiper mode switch signal circuit for continuity to ground using a multimeter; resistance should be high (open) when switch is in park position.
Disconnect the wiper switch and measure resistance between signal wire and ground; if near 0 ohms, repair short in wiring or replace switch.
If wiring and switch are good, test BCM input by monitoring voltage on signal wire with switch connected; compare to manufacturer specs. Replace BCM if faulty.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but wiper operation may be unpredictable. Avoid driving in rain or conditions requiring reliable wipers until repaired.
How much does it cost to fix?▼
Typically $100–$400, depending on whether the switch, wiring repair, or BCM replacement is needed. BCM replacement can be higher.