What Does B2110 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the front windshield wiper motor relay control circuit. An open circuit means there is a break in the electrical path between the BCM and the wiper motor relay, preventing the relay from being energized. This affects the vehicle's windshield wiper system operation, and the wipers may be completely inoperative or work intermittently.
Common Causes
35%
Failed or internally open front wiper motor relay
30%
Broken, corroded, or disconnected wiring harness or connector between BCM and wiper relay
20%
Blown fuse in the wiper relay control circuit
10%
Failed Body Control Module (BCM) unable to provide relay control signal
5%
Poor ground connection at relay or BCM
Diagnostic Steps
1
Step 1: Locate the front wiper motor relay (typically in the main fuse/relay box under hood or dash). Visually inspect the relay for physical damage, corrosion, or burnt contacts. Check the relay's fuse for continuity using a multimeter.
2
Step 2: Remove the wiper relay and test it using a multimeter for continuity across coil terminals (should read 50-120 ohms) and verify switching function by applying 12V to coil terminals while checking for continuity across load terminals.
3
Step 3: With relay removed, use a multimeter to check for battery voltage (12V+) at the relay socket power supply terminal with ignition on. Then check for ground at the appropriate ground terminal (should read <0.5 ohms to ground).
4
Step 4: Backprobe the BCM connector at the wiper relay control wire terminal with a multimeter. Command the wipers on using scan tool active tests (if available) and verify the BCM is sending switching voltage (typically 12V or ground depending on relay type). If no signal, suspect BCM or internal wiring fault.
5
Step 5: Inspect all wiring and connectors between the BCM and relay socket for breaks, chafing, corrosion, or loose terminals. Pay special attention to areas where harnesses pass through firewalls or flex points. Repair any damaged wiring and apply dielectric grease to connectors.
6
Step 6: After repairs, clear the code, cycle the wiper switch through all positions, and verify proper wiper operation. Re-scan for codes to confirm the fault has been resolved and the circuit is operating normally.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the front windshield wiper motor relay control circuit. An open circuit means there is a break in the electrical path between the BCM and the wiper motor relay, preventing the relay from being energized. This affects t...
The most common cause of B2110 (Front Wiper Motor Relay Circuit Open (changed from Failure 2/6/97)) is: Failed or internally open front wiper motor relay
Typical repair costs for B2110 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive in clear weather, but inoperative wipers create a significant safety hazard in rain, snow, or any reduced visibility conditions. Repair should be completed before driving in inclement weather as visibility impairment greatly increases accident risk.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2110 to identify the root cause.
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Quick Info
Category
Body
System
Windshield Wiper System
Difficulty
Type
Generic (SAE)
Recommended Tools
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