Wiper Park Sense Circuit Short to Battery
The B1448 code indicates a short to battery voltage in the wiper park sense circuit. This circuit uses a sensor or switch to monitor the wiper mechanism's rest position, sending a variable voltage signal to the body control module (BCM) or wiper control module. When the module detects an abnormally high voltage exceeding the expected threshold, it sets this manufacturer-specific DTC. The system relies on this signal to stop the wipers in the correct park position after each cycle.
1. Commonly Affected Makes
2. Most Common Causes
- Wiper park sense circuit wiring shorted to battery positive (B+)
- Faulty wiper park position sensor/switch internally shorted
- Damaged connector or harness with pins touching each other
- Body control module (BCM) internal fault in the input circuit
- Corrosion in connectors causing voltage migration between circuits
3. Symptoms You Will Notice
- Wipers do not park correctly or stop in random positions
- Wipers may operate continuously or fail to stop
- Check engine or wiper warning light illuminated
4. Step-by-Step Diagnosis
Scan for additional codes and note freeze frame data
Visually inspect wiper park sense circuit wiring and connectors for damage, corrosion, or shorts to battery voltage
Test the wiper park position sensor/switch for proper resistance and voltage output
Check for battery voltage on the signal wire when the circuit should be low
If wiring and sensor are good, suspect a faulty BCM or wiper control module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the wipers may not park correctly or could operate unexpectedly, which can be a safety hazard in rain. It's best to repair promptly.
How much does it cost to fix?▼
Typically $100 to $300 for diagnosis and repair, depending on whether the issue is a simple wiring fix or requires replacing the sensor or BCM.