B1826: Wiper Rear High Limit Input Circuit Failure

What does B1826 mean?

B1826 is a diagnostic trouble code indicating "Wiper Rear High Limit Input Circuit Failure". The ECU is reading a voltage that is above the expected range. This can be caused by a short to power in the wiring, a failed sensor, or a connector issue in the wipers & washers.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Intermittent warning lights
• Erratic gauge readings

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 body control module or something wired through it. That module runs the unglamorous things you only miss when they stop: headlights, wipers, indicators, central locking. The car will usually drive, but check what has actually stopped working before you rely on it at night or in the wet.