What Does B1448 Mean?
This code indicates the Body Control Module (BCM) has detected that the wiper park sense circuit is experiencing a short to battery voltage (B+). The wiper park sense circuit monitors when the wipers have returned to their rest position. The BCM detected voltage on this circuit when it should be at ground or lower voltage, indicating unwanted battery voltage is present on the signal wire.
Common Causes
40%
Damaged or chafed wiring harness causing the park sense signal wire to short against battery voltage supply wire
30%
Faulty wiper motor park sense switch or internal motor short circuit
20%
Corroded or damaged connector terminals at wiper motor allowing cross-circuit contamination
10%
Failed Body Control Module with internal short circuit on park sense input
Diagnostic Steps
1
Step 1: Perform visual inspection of wiper motor wiring harness from motor to BCM, checking for chafed, pinched, or damaged insulation especially near sharp edges, brackets, and through firewall grommets
2
Step 2: Disconnect wiper motor connector and inspect terminals for corrosion, water intrusion, bent pins, or signs of overheating. Measure voltage on park sense circuit wire at BCM side with connector disconnected using multimeter - should read 0V with key on; if battery voltage present, harness is shorted to power
3
Step 3: With wiper motor disconnected and ignition on, check park sense circuit for resistance to ground and to battery voltage using multimeter. Resistance to B+ should be greater than 10k ohms; lower readings confirm short to battery in harness
4
Step 4: If harness tests good, reconnect wiper motor and backprobe park sense signal wire while manually cycling wipers to park position. Signal should toggle between ground and 5V reference; constant battery voltage indicates internal motor failure
5
Step 5: Clear codes, operate wipers through full cycle to park position, and verify code does not return. If code returns immediately with known-good wiring and motor, suspect BCM internal fault
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected that the wiper park sense circuit is experiencing a short to battery voltage (B+). The wiper park sense circuit monitors when the wipers have returned to their rest position. The BCM detected voltage on this circuit when it should be at ...
The most common cause of B1448 (Wiper Park Sense Circuit Short To Battery) is: Damaged or chafed wiring harness causing the park sense signal wire to short against battery voltage supply wire
Typical repair costs for B1448 range from $120 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. Wipers may fail to park in correct position or may not shut off automatically, requiring manual operation. Repair at earliest convenience to maintain proper visibility during inclement weather.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1448 to identify the root cause.
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Quick Info
Category
Body
System
Wiper/Washer System
Difficulty
Type
Manufacturer
Recommended Tools
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