What Does B1827 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the rear wiper motor high limit position input circuit. The high limit switch signals when the rear wiper has reached its maximum travel position during the park cycle. An open circuit means the BCM is not receiving the expected voltage signal from this position sensor, preventing proper wiper operation and park positioning.
Common Causes
45%
Open or broken wiring between rear wiper motor and BCM, or corroded connector terminals at wiper motor or BCM
30%
Failed rear wiper motor internal position sensor or limit switch
15%
Damaged or corroded ground connection for rear wiper motor circuit
10%
Failed Body Control Module unable to properly read sensor input
Diagnostic Steps
1
Step 1: Perform visual inspection of rear wiper motor connector and BCM connector for corrosion, pushed-out pins, or physical damage. Check for water intrusion in rear hatch area around wiper motor mounting
2
Step 2: Using a digital multimeter, backprobe the high limit position sensor circuit at the rear wiper motor connector and check for continuity to the BCM connector (should read less than 5 ohms if circuit is intact)
3
Step 3: With ignition on, measure voltage at the wiper motor connector on the high limit input wire while manually cycling the wiper arm through its range. Expected voltage should transition between 0V and battery voltage at the high limit position
4
Step 4: If wiring tests pass, remove rear wiper motor assembly and bench test the internal position sensor with an ohmmeter. Resistance should change smoothly through the wiper motor rotation range with distinct change at high limit position
5
Step 5: Check rear wiper motor ground circuit for less than 1 ohm resistance to chassis ground. Clean and repair ground connections as needed
6
Step 6: After repairs, clear codes, operate rear wiper through multiple complete cycles, and verify code does not return and wiper parks correctly in all modes
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the rear wiper motor high limit position input circuit. The high limit switch signals when the rear wiper has reached its maximum travel position during the park cycle. An open circuit means the BCM is not receiving th...
The most common cause of B1827 (Wiper Rear High Limit Input Circuit Open) is: Open or broken wiring between rear wiper motor and BCM, or corroded connector terminals at wiper motor or BCM
Typical repair costs for B1827 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects rear wiper operation. Repair is not urgent but should be addressed for proper rear visibility during inclement weather conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1827 to identify the root cause.
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Quick Info
Category
Body
System
Rear Wiper/Washer System
Difficulty
Type
Manufacturer
Recommended Tools
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