B2110: Front Wiper Motor Relay Circuit Open
Diagnostic trouble code B2110 indicates an open circuit in the front wiper motor relay control circuit. This manufacturer-specific code, originally documented as 'Failure' before a February 6, 1997 update, means the body control module has detected a break in the relay control circuit that powers the front wiper motor. The open circuit prevents the relay from closing its contacts, cutting power to the wiper motor and causing the front wipers to be inoperative or work intermittently.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty front wiper relay with an open coil
- Damaged, corroded, or disconnected wiring in the relay circuit
- Loose relay connector or corroded pins
- Blown fuse in the relay power supply circuit
- Body control module (GEM/SJB on Ford vehicles) with internal relay driver failure
- Poor ground in the relay control circuit
3. Symptoms You Will Notice
- Front wipers do not operate at all
- Front wipers operate intermittently or only on some speeds
4. Step-by-Step Diagnosis
Check and replace any blown fuses in the wiper relay circuit.
Inspect the wiper relay for proper operation; test coil resistance and swap with a known good relay if possible.
Visually inspect wiring and connectors for damage, corrosion, or looseness; repair as needed.
Verify relay control circuit ground and power supply at the relay socket.
If all else is good, test the body control module output to the relay; replace module if faulty.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive, but you will not have front windshield wipers. Avoid driving in rain or conditions requiring wipers until repaired.
How much does it cost to fix?▼
Repair costs typically range from $50 to $200 for a relay or fuse, up to $500–$800 if the body control module needs replacement.