OBD Guide

B3875

Windshield Wiper High Speed Relay Circuit

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–89 (est.)

Symptoms

  • Lack of high speed wipers
  • Wipers only work at low speed
  • Relay clicks without activating wipers

Causes

  • Faulty high speed relay
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Problems with the ECU

How to Fix

  1. Check the wiper circuit fuse
  2. Test High Speed Relay
  3. Inspect the wiring harness for damage
  4. Check contacts in connectors
  5. Replace relay or wiring harness if necessary

Related codes

Error B3875 by Vehicle Brand