What Does B1824 Mean?
This code indicates the Body Control Module (BCM) has detected voltage on the rear wiper park position sensor circuit when it should be grounded or at a lower voltage level. The BCM monitors this circuit to determine when the rear wiper blade is in its parked/rest position, and has identified an abnormal short to battery voltage condition. This prevents the BCM from accurately detecting the wiper's park position, which may cause the wiper to not return to its proper rest position or fail to operate correctly.
Common Causes
45%
Damaged or chafed wiring harness causing short to power between rear wiper motor and BCM
30%
Failed rear wiper motor with internal short to battery voltage in park sense circuit
15%
Corroded or water-damaged connector terminals at rear wiper motor or BCM creating voltage leak
10%
Failed or malfunctioning Body Control Module with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of rear wiper motor, wiring harness from liftgate/hatch to BCM, and all connectors for obvious damage, chafing against metal edges, water intrusion, or corrosion. Pay special attention to areas where harness passes through rubber boots or body panels.
2
Step 2: Disconnect rear wiper motor connector and use digital multimeter to measure voltage on the park sense circuit wire at the vehicle harness side with ignition on. Reading should be 0V or ground reference; if battery voltage is present, wiring harness has short to power between motor and BCM.
3
Step 3: If no voltage found at motor connector, measure resistance between park sense circuit terminal at disconnected motor and known good ground with ignition off. Infinite resistance indicates open circuit in motor; low resistance or continuity may indicate internal motor short when combined with voltage presence during operation.
4
Step 4: Inspect BCM connector terminals for corrosion, pushed-back pins, or moisture. If wiring and motor test normal, perform BCM power and ground circuit verification to rule out module issues.
5
Step 5: If wiring harness shows short to battery voltage, trace harness routing and repair damaged section, ensuring proper insulation and routing away from sharp edges. If motor is faulty, replace rear wiper motor assembly.
6
Step 6: Clear codes, cycle rear wiper through multiple park cycles, and verify park sense circuit voltage drops to ground reference when wiper returns to park position. Confirm no code returns.
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected voltage on the rear wiper park position sensor circuit when it should be grounded or at a lower voltage level. The BCM monitors this circuit to determine when the rear wiper blade is in its parked/rest position, and has identified an abn...
The most common cause of B1824 (Wiper Rear Park Sense Input Circuit Short To Battery) is: Damaged or chafed wiring harness causing short to power between rear wiper motor and BCM
Typical repair costs for B1824 range from $120 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 park position detection and does not impact primary vehicle operation or safety systems. Repair at convenience, though rear wiper functionality may be compromised in poor weather conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1824 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System - Rear Wiper
Difficulty
Type
Manufacturer
Recommended Tools
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