What Does B1825 Mean?
This code indicates the Body Control Module (BCM) has detected a short to ground in the rear wiper park position sensor circuit. The park sense switch tells the BCM when the rear wiper blade has returned to its rest position after a wipe cycle. When voltage in this circuit drops below the expected threshold due to a short to ground, the BCM sets this code and the rear wiper may fail to park correctly or operate erratically.
Common Causes
45%
Damaged, chafed, or pinched wiring in the rear wiper harness causing short to ground, often in liftgate/hatch hinge area due to flexing
30%
Faulty rear wiper motor with internal short in park sense switch circuit or corroded connector terminals
15%
Water intrusion or corrosion at rear wiper motor connector causing intermittent or permanent short to ground
10%
Failed Body Control Module with internal circuit fault on park sense input
Diagnostic Steps
1
Step 1: Perform visual inspection of rear wiper motor, harness, and connector for obvious damage, chafing, water intrusion, or corrosion. Pay special attention to liftgate hinge area where wiring flexes during opening/closing
2
Step 2: Disconnect rear wiper motor connector and use a digital multimeter to check resistance from the park sense signal wire (refer to wiring diagram for specific terminal) to ground. Should read open circuit (OL or infinite resistance). If reading near 0 ohms, short is in harness between motor and BCM
3
Step 3: With motor connector still disconnected, measure resistance of park sense circuit within the wiper motor itself (between signal terminal and motor ground/case). Should read according to specification when manually moving motor to park position. If shorted (near 0 ohms) in all positions, motor is faulty
4
Step 4: If harness shows short to ground, carefully inspect and wiggle-test harness through liftgate/hatch area while monitoring resistance. Use electrical schematic to identify all connectors in circuit path and inspect each for corrosion or terminal damage
5
Step 5: Repair or replace damaged wiring/connectors as found. If no external faults found and motor tests good, suspect BCM internal fault. Clear codes, reconnect all components, and operate rear wiper through multiple cycles to verify park function and confirm no code returns
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to ground in the rear wiper park position sensor circuit. The park sense switch tells the BCM when the rear wiper blade has returned to its rest position after a wipe cycle. When voltage in this circuit drops below the expected t...
The most common cause of B1825 (Wiper Rear Park Sense Input Circuit Short To Ground) is: Damaged, chafed, or pinched wiring in the rear wiper harness causing short to ground, often in liftgate/hatch hinge area due to flexing
Typical repair costs for B1825 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 affects only rear wiper parking function. Repair at convenience, though rear wiper may not park correctly which can obstruct rear visibility in rain/snow conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1825 to identify the root cause.
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Quick Info
Category
Body
System
Body/Wiper System
Difficulty
Type
Manufacturer
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