B1465: Wiper Brake/Run Relay Circuit Open

What does B1465 mean?

B1465 is a diagnostic trouble code indicating "Wiper Brake/Run Relay Circuit Open". This means there is an electrical break in the wipers & washers wiring — a connector may be unplugged, a wire broken, or a component has failed internally. The ECU detected no signal where it expected one.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• ABS warning light on
• Brake pedal feels different
• Unusual braking behaviour
• Intermittent warning lights

Common causes

• Damaged or corroded wiring harness
• Loose or disconnected electrical connector
• Failed wipers & washers sensor or actuator
• Blown fuse in the related circuit
• Poor ground connection

What should you do?

This code sits in the braking system. Your normal hydraulic brakes generally still work, but the electronics layered on top of them, ABS, EBD and emergency brake assist, can drop out. You will not notice until you brake hard or brake on a wet or loose surface, and that is the moment they would have helped. Treat the car as needing a workshop rather than as safe to drive, and get it looked at before your next real trip.