What Does B1823 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the rear wiper park position sensor input circuit. The park sense switch tells the BCM when the rear wiper blade has returned to its home/rest position. An open circuit means there is a break in the electrical pathway, preventing the BCM from receiving the park position signal, which may cause the wiper to not properly park or function intermittently.
Common Causes
45%
Broken or corroded wiring in the rear wiper harness, often near the hatch/liftgate hinge area due to flexing and stress
30%
Faulty rear wiper motor with internal park switch failure or damaged connector terminals
15%
Corroded or loose electrical connector at the rear wiper motor or BCM connection point
10%
Damaged or broken rear wiper park position switch integrated into the wiper mechanism
Diagnostic Steps
1
Step 1: Perform visual inspection of the rear wiper motor connector and harness, especially in the hatch/liftgate hinge area where wires flex during opening and closing. Check for broken wires, damaged insulation, corrosion, or pushed-out connector pins.
2
Step 2: Using a digital multimeter, check for continuity in the park sense circuit wire from the rear wiper motor connector back to the BCM connector (consult vehicle-specific wiring diagram for wire color and pin locations). Expected reading should be less than 5 ohms resistance with no open circuit.
3
Step 3: Disconnect the rear wiper motor connector and measure resistance across the park switch terminals within the motor itself while manually rotating the wiper motor shaft to the park position. Expected reading should show continuity (0-5 ohms) in park position and open circuit in all other positions.
4
Step 4: Check power and ground supply to the rear wiper motor using a multimeter with key on. Verify battery voltage on power supply wire and less than 0.5V on ground circuit. If wiring and power/ground are confirmed good but park switch shows no continuity, replace the rear wiper motor assembly.
5
Step 5: After repair, clear the code and cycle the rear wiper through several complete cycles to verify proper park function and confirm the code does not return.
Estimated Repair Cost
$85 - $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 park position sensor input circuit. The park sense switch tells the BCM when the rear wiper blade has returned to its home/rest position. An open circuit means there is a break in the electrical pathway,...
The most common cause of B1823 (Wiper Rear Park Sense Input Circuit Open) is: Broken or corroded wiring in the rear wiper harness, often near the hatch/liftgate hinge area due to flexing and stress
Typical repair costs for B1823 range from $85 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 parking function. The rear wiper may not return to proper rest position or may stop functioning, which could reduce rear visibility in inclement weather. Repair at convenience but address before winter/rainy season.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1823 to identify the root cause.
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Quick Info
Category
Body
System
Body Control/Rear Wiper System
Difficulty
Type
Manufacturer
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